Environmental_Science/Environmental_Science__Why_chemists_can’t_quit_palladium.json

{"nodes": [{"id": "0", "name": "propargylic carbonates"}, {"id": "1", "name": "schiff base"}, {"id": "2", "name": "reductive elimination"}, {"id": "3", "name": "transmission electron microscopy"}, {"id": "4", "name": "digital library"}, {"id": "5", "name": "crystal structure"}, {"id": "6", "name": "natural products"}, {"id": "7", "name": "2,2 \u2032"}, {"id": "8", "name": "smoking cessation"}, {"id": "9", "name": "carbon monoxide"}, {"id": "10", "name": "heck reaction"}, {"id": "11", "name": "organic synthesis"}, {"id": "12", "name": "quit attempts"}, {"id": "13", "name": "single crystal"}, {"id": "14", "name": "carboxylic acid"}, {"id": "15", "name": "drug discovery"}, {"id": "16", "name": "mental health"}, {"id": "17", "name": "fuel cell"}, {"id": "18", "name": "carbon dioxide"}, {"id": "19", "name": "room temperature"}, {"id": "20", "name": "organic chemistry"}, {"id": "21", "name": "green chemistry"}, {"id": "22", "name": "aryl chlorides"}, {"id": "23", "name": "density functional theory"}, {"id": "24", "name": "hydrochloric acid"}, {"id": "25", "name": "united states"}, {"id": "26", "name": "complexing agent"}, {"id": "27", "name": "biologically active"}, {"id": "28", "name": "american chemical society"}, {"id": "29", "name": "puts forward"}, {"id": "30", "name": "health care"}, {"id": "31", "name": "oxidative addition"}, {"id": "32", "name": "detection limit"}, {"id": "33", "name": "medicinal chemistry"}, {"id": "34", "name": "aqueous solution"}, {"id": "35", "name": "acrylic acid"}, {"id": "36", "name": "oxidation state"}, {"id": "37", "name": "scanning electron microscopy"}, {"id": "38", "name": "electron microscopy"}, {"id": "39", "name": "particle size"}, {"id": "40", "name": "precious metals"}, {"id": "41", "name": "nineteenth century"}, {"id": "42", "name": "acetic acid"}, {"id": "43", "name": "transition metal"}, {"id": "44", "name": "royal society"}, {"id": "45", "name": "catalytic cycle"}, {"id": "46", "name": "nobel prize"}, {"id": "47", "name": "formic acid"}, {"id": "48", "name": "nitric acid"}, {"id": "49", "name": "aqua regia"}, {"id": "50", "name": "x ray photoelectron spectroscopy"}, {"id": "51", "name": "functional groups"}, {"id": "52", "name": "reducing agent"}, {"id": "53", "name": "boronic acids"}, {"id": "54", "name": "nobel prize in chemistry"}, {"id": "55", "name": "ionic liquid"}, {"id": "56", "name": "nucleophilic attack"}, {"id": "57", "name": "molecular oxygen"}, {"id": "58", "name": "higher education"}, {"id": "59", "name": "african american"}], "evolve_edges": [{"2000": [{"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2000}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2000}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2000}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2000}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2000}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 1.0, "year": 2000}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 1.0, "year": 2000}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2000}]}, {"2001": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2001}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2001}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 1.0, "year": 2001}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2001}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2001}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2001}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2001}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2001}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2001}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2001}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2001}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2001}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2001}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2001}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 1.0, "year": 2001}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2001}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2001}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2001}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2001}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2001}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2001}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2001}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2001}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2001}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2001}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2001}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2001}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2001}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 1.0, "year": 2001}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2001}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2001}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2001}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2001}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2001}]}, {"2002": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2002}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2002}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 2.0, "year": 2002}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2002}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2002}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2002}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2002}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 1.0, "year": 2002}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 1.0, "year": 2002}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2002}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2002}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2002}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2002}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2002}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2002}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2002}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2002}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 1.0, "year": 2002}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2002}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2002}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2002}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2002}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 1.0, "year": 2002}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2002}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2002}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2002}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2002}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2002}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2002}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2002}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2002}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2002}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2002}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2002}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2002}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 1.0, "year": 2002}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2002}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2002}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2002}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2002}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2002}]}, {"2003": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2003}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2003}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 2.0, "year": 2003}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2003}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2003}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2003}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2003}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 1.0, "year": 2003}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2003}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 2.0, "year": 2003}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2003}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2003}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2003}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2003}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2003}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2003}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2003}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2003}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 1.0, "year": 2003}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 1.0, "year": 2003}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2003}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2003}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2003}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2003}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 1.0, "year": 2003}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2003}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 1.0, "year": 2003}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2003}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2003}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2003}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2003}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2003}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2003}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2003}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2003}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2003}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2003}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2003}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2003}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2003}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 1.0, "year": 2003}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2003}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2003}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2003}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2003}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2003}]}, {"2004": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2004}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2004}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 2.0, "year": 2004}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2004}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2004}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2004}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 1.0, "year": 2004}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2004}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 1.0, "year": 2004}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2004}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 3.0, "year": 2004}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2004}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2004}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2004}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2004}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2004}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 1.0, "year": 2004}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2004}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2004}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2004}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2004}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2004}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 1.0, "year": 2004}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 1.0, "year": 2004}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2004}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2004}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2004}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2004}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2004}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 1.0, "year": 2004}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2004}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2004}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 1.0, "year": 2004}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2004}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2004}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2004}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2004}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2004}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2004}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2004}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2004}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2004}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2004}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2004}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2004}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2004}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2004}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 1.0, "year": 2004}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2004}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2004}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2004}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2004}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2004}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2004}]}, {"2005": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2005}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2005}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 2.0, "year": 2005}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2005}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2005}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2005}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 1.0, "year": 2005}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2005}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2005}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 1.0, "year": 2005}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 2.0, "year": 2005}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 4.0, "year": 2005}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2005}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2005}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2005}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2005}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2005}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2005}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2005}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 1.0, "year": 2005}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2005}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2005}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2005}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2005}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2005}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 1.0, "year": 2005}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2005}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 2.0, "year": 2005}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 1.0, "year": 2005}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2005}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2005}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2005}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2005}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2005}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2005}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2005}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2005}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2005}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2005}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2005}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2005}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 1.0, "year": 2005}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2005}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2005}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 1.0, "year": 2005}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2005}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2005}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 1.0, "year": 2005}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2005}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2005}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2005}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2005}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2005}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 1.0, "year": 2005}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2005}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2005}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2005}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2005}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2005}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2005}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2005}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2005}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2005}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2005}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2005}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 3.0, "year": 2005}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 1.0, "year": 2005}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2005}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2005}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2005}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2005}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2005}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2005}]}, {"2006": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2006}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2006}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 3.0, "year": 2006}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2006}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2006}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2006}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 1.0, "year": 2006}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2006}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2006}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 1.0, "year": 2006}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 2.0, "year": 2006}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 5.0, "year": 2006}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2006}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2006}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2006}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2006}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2006}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2006}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2006}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2006}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 1.0, "year": 2006}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2006}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2006}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2006}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2006}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2006}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 1.0, "year": 2006}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2006}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 2.0, "year": 2006}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 1.0, "year": 2006}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2006}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2006}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2006}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2006}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2006}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2006}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2006}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 1.0, "year": 2006}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2006}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2006}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2006}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2006}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2006}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2006}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 1.0, "year": 2006}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2006}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2006}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 1.0, "year": 2006}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2006}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2006}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 1.0, "year": 2006}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2006}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2006}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2006}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2006}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2006}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 2.0, "year": 2006}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2006}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2006}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 1.0, "year": 2006}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2006}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2006}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2006}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2006}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2006}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2006}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2006}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2006}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2006}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2006}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 4.0, "year": 2006}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2006}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 1.0, "year": 2006}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2006}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2006}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2006}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2006}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2006}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2006}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2006}]}, {"2007": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2007}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2007}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 4.0, "year": 2007}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2007}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2007}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2007}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 1.0, "year": 2007}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2007}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2007}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 1.0, "year": 2007}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 2.0, "year": 2007}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 5.0, "year": 2007}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2007}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2007}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2007}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2007}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 1.0, "year": 2007}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2007}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2007}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2007}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2007}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 1.0, "year": 2007}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2007}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2007}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2007}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2007}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2007}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2007}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 1.0, "year": 2007}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2007}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 2.0, "year": 2007}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 1.0, "year": 2007}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2007}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2007}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2007}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2007}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2007}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2007}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2007}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 1.0, "year": 2007}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2007}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2007}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2007}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2007}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2007}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 3.0, "year": 2007}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 1.0, "year": 2007}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2007}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2007}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 1.0, "year": 2007}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2007}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2007}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 1.0, "year": 2007}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2007}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2007}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2007}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2007}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2007}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2007}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2007}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2007}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2007}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2007}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2007}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 1.0, "year": 2007}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2007}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2007}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2007}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2007}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2007}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2007}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2007}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2007}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2007}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2007}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2007}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2007}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 4.0, "year": 2007}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2007}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 1.0, "year": 2007}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2007}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2007}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2007}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2007}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2007}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2007}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2007}]}, {"2008": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2008}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2008}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 4.0, "year": 2008}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2008}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2008}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2008}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 1.0, "year": 2008}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2008}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2008}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 1.0, "year": 2008}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 2.0, "year": 2008}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 6.0, "year": 2008}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2008}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2008}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2008}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2008}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2008}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 1.0, "year": 2008}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2008}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2008}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2008}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2008}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 1.0, "year": 2008}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2008}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2008}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2008}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2008}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2008}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2008}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 1.0, "year": 2008}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 1.0, "year": 2008}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2008}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 2.0, "year": 2008}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 1.0, "year": 2008}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2008}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2008}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2008}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2008}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2008}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2008}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2008}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 1.0, "year": 2008}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2008}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2008}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2008}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2008}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2008}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 3.0, "year": 2008}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 1.0, "year": 2008}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2008}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2008}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 1.0, "year": 2008}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2008}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2008}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 1.0, "year": 2008}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2008}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2008}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2008}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2008}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2008}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2008}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2008}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2008}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2008}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2008}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2008}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2008}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2008}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2008}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2008}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 1.0, "year": 2008}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2008}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2008}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2008}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2008}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2008}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2008}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2008}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2008}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2008}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2008}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2008}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2008}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 5.0, "year": 2008}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2008}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 1.0, "year": 2008}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2008}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2008}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2008}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2008}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2008}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2008}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2008}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2008}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2008}]}, {"2009": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2009}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2009}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 4.0, "year": 2009}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2009}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2009}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2009}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 1.0, "year": 2009}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2009}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2009}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 2.0, "year": 2009}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2009}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 8.0, "year": 2009}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2009}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2009}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2009}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2009}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2009}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 1.0, "year": 2009}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2009}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2009}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2009}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 1.0, "year": 2009}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 1.0, "year": 2009}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2009}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2009}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2009}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2009}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2009}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2009}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 1.0, "year": 2009}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 1.0, "year": 2009}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2009}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 2.0, "year": 2009}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2009}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2009}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2009}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2009}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2009}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2009}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2009}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2009}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2009}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 1.0, "year": 2009}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2009}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2009}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2009}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2009}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2009}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 3.0, "year": 2009}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2009}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2009}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2009}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 2.0, "year": 2009}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2009}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2009}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 2.0, "year": 2009}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2009}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2009}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 1.0, "year": 2009}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 1.0, "year": 2009}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2009}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2009}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2009}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2009}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2009}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2009}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2009}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2009}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2009}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2009}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2009}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2009}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2009}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2009}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 3.0, "year": 2009}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2009}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2009}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2009}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2009}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2009}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2009}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2009}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2009}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2009}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2009}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 1.0, "year": 2009}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2009}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2009}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 6.0, "year": 2009}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2009}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 1.0, "year": 2009}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2009}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2009}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2009}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2009}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2009}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2009}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2009}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2009}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2009}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2009}]}, {"2010": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2010}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2010}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 5.0, "year": 2010}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2010}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2010}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2010}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2010}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2010}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2010}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2010}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2010}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 10.0, "year": 2010}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2010}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 1.0, "year": 2010}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2010}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2010}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2010}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2010}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 2.0, "year": 2010}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2010}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2010}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2010}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2010}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2010}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2010}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2010}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2010}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2010}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2010}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2010}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2010}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 1.0, "year": 2010}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 1.0, "year": 2010}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2010}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 2.0, "year": 2010}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2010}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2010}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2010}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2010}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2010}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2010}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2010}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2010}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2010}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 1.0, "year": 2010}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2010}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2010}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2010}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2010}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2010}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 3.0, "year": 2010}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2010}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2010}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2010}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2010}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2010}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2010}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2010}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2010}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2010}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 1.0, "year": 2010}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2010}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 1.0, "year": 2010}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2010}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2010}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2010}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2010}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2010}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2010}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2010}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2010}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2010}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2010}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2010}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2010}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2010}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2010}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2010}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 3.0, "year": 2010}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2010}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 1.0, "year": 2010}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2010}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2010}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2010}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2010}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2010}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2010}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2010}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2010}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2010}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2010}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 1.0, "year": 2010}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2010}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2010}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 6.0, "year": 2010}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2010}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 2.0, "year": 2010}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2010}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2010}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2010}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2010}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2010}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2010}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2010}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2010}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2010}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2010}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2010}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2010}]}, {"2011": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2011}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2011}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 5.0, "year": 2011}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2011}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2011}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2011}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2011}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2011}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2011}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2011}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2011}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 12.0, "year": 2011}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2011}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 1.0, "year": 2011}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2011}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2011}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2011}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2011}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2011}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2011}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2011}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 2.0, "year": 2011}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2011}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 1.0, "year": 2011}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2011}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2011}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2011}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2011}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2011}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2011}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2011}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2011}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2011}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2011}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2011}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2011}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 1.0, "year": 2011}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 2.0, "year": 2011}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2011}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2011}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 1.0, "year": 2011}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2011}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2011}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2011}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2011}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2011}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2011}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2011}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2011}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2011}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2011}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 1.0, "year": 2011}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2011}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2011}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2011}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2011}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2011}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 3.0, "year": 2011}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2011}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2011}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2011}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2011}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2011}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2011}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2011}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2011}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2011}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 1.0, "year": 2011}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2011}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 1.0, "year": 2011}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2011}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2011}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2011}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2011}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2011}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2011}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2011}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2011}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2011}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2011}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2011}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2011}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 1.0, "year": 2011}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2011}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2011}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2011}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2011}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2011}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2011}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 3.0, "year": 2011}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2011}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2011}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2011}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2011}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2011}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2011}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2011}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2011}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2011}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2011}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2011}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2011}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2011}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 1.0, "year": 2011}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2011}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2011}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 6.0, "year": 2011}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2011}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 2.0, "year": 2011}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2011}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2011}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2011}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2011}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2011}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2011}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2011}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2011}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2011}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2011}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 4.0, "year": 2011}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2011}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2011}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 1.0, "year": 2011}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2011}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2011}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2011}]}, {"2012": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2012}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2012}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 5.0, "year": 2012}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2012}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2012}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2012}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2012}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 1.0, "year": 2012}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2012}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2012}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2012}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 12.0, "year": 2012}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2012}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 1.0, "year": 2012}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2012}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2012}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2012}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2012}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2012}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2012}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2012}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 2.0, "year": 2012}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2012}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2012}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 2.0, "year": 2012}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2012}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2012}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2012}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2012}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2012}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2012}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2012}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2012}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2012}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2012}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2012}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2012}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 1.0, "year": 2012}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 2.0, "year": 2012}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2012}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2012}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2012}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2012}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2012}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2012}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2012}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2012}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2012}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2012}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2012}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2012}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2012}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2012}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 1.0, "year": 2012}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2012}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2012}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2012}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2012}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2012}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 3.0, "year": 2012}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2012}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2012}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2012}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2012}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2012}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2012}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2012}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2012}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2012}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 1.0, "year": 2012}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2012}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 1.0, "year": 2012}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2012}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2012}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2012}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2012}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2012}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2012}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2012}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2012}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2012}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2012}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2012}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2012}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 1.0, "year": 2012}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2012}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2012}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2012}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2012}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2012}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2012}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 3.0, "year": 2012}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2012}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2012}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2012}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2012}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2012}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2012}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2012}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2012}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2012}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2012}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2012}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 1.0, "year": 2012}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2012}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 1.0, "year": 2012}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 1.0, "year": 2012}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2012}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2012}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2012}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 6.0, "year": 2012}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2012}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 2.0, "year": 2012}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2012}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2012}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2012}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2012}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2012}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2012}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2012}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2012}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2012}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2012}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 4.0, "year": 2012}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2012}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2012}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 1.0, "year": 2012}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2012}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2012}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2012}]}, {"2013": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2013}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2013}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 5.0, "year": 2013}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2013}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2013}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2013}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2013}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 2.0, "year": 2013}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2013}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2013}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2013}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 13.0, "year": 2013}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2013}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 2.0, "year": 2013}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2013}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2013}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2013}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2013}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2013}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2013}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2013}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 2.0, "year": 2013}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2013}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2013}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 2.0, "year": 2013}, {"source": "6", "target": "51", "source_name": "natural products", "target_name": "functional groups", "weight": 1.0, "year": 2013}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2013}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2013}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2013}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2013}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2013}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2013}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2013}, {"source": "10", "target": "28", "source_name": "heck reaction", "target_name": "american chemical society", "weight": 1.0, "year": 2013}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2013}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2013}, {"source": "10", "target": "46", "source_name": "heck reaction", "target_name": "nobel prize", "weight": 1.0, "year": 2013}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2013}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2013}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2013}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 2.0, "year": 2013}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 2.0, "year": 2013}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2013}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2013}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2013}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2013}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2013}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2013}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2013}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2013}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2013}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2013}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2013}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2013}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2013}, {"source": "14", "target": "18", "source_name": "carboxylic acid", "target_name": "carbon dioxide", "weight": 1.0, "year": 2013}, {"source": "14", "target": "20", "source_name": "carboxylic acid", "target_name": "organic chemistry", "weight": 1.0, "year": 2013}, {"source": "14", "target": "22", "source_name": "carboxylic acid", "target_name": "aryl chlorides", "weight": 1.0, "year": 2013}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2013}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 2.0, "year": 2013}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2013}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2013}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2013}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2013}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2013}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 4.0, "year": 2013}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2013}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2013}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2013}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2013}, {"source": "18", "target": "20", "source_name": "carbon dioxide", "target_name": "organic chemistry", "weight": 1.0, "year": 2013}, {"source": "18", "target": "22", "source_name": "carbon dioxide", "target_name": "aryl chlorides", "weight": 1.0, "year": 2013}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2013}, {"source": "18", "target": "57", "source_name": "carbon dioxide", "target_name": "molecular oxygen", "weight": 1.0, "year": 2013}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2013}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2013}, {"source": "19", "target": "43", "source_name": "room temperature", "target_name": "transition metal", "weight": 1.0, "year": 2013}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2013}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2013}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 1.0, "year": 2013}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2013}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 1.0, "year": 2013}, {"source": "20", "target": "22", "source_name": "organic chemistry", "target_name": "aryl chlorides", "weight": 1.0, "year": 2013}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2013}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2013}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2013}, {"source": "20", "target": "57", "source_name": "organic chemistry", "target_name": "molecular oxygen", "weight": 1.0, "year": 2013}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2013}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2013}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2013}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2013}, {"source": "22", "target": "57", "source_name": "aryl chlorides", "target_name": "molecular oxygen", "weight": 1.0, "year": 2013}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2013}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2013}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2013}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2013}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2013}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 2.0, "year": 2013}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2013}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2013}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2013}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2013}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2013}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2013}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 3.0, "year": 2013}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2013}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2013}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2013}, {"source": "28", "target": "46", "source_name": "american chemical society", "target_name": "nobel prize", "weight": 1.0, "year": 2013}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2013}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2013}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2013}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2013}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2013}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2013}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2013}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2013}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 2.0, "year": 2013}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2013}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 1.0, "year": 2013}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 1.0, "year": 2013}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2013}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2013}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2013}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 6.0, "year": 2013}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2013}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 3.0, "year": 2013}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2013}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2013}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2013}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2013}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2013}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2013}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2013}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2013}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2013}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2013}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 4.0, "year": 2013}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2013}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2013}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 1.0, "year": 2013}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2013}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2013}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2013}]}, {"2014": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 1.0, "year": 2014}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2014}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 5.0, "year": 2014}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2014}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2014}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2014}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2014}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 2.0, "year": 2014}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2014}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2014}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2014}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 13.0, "year": 2014}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2014}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 2.0, "year": 2014}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2014}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2014}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2014}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2014}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2014}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2014}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2014}, {"source": "6", "target": "20", "source_name": "natural products", "target_name": "organic chemistry", "weight": 1.0, "year": 2014}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 2.0, "year": 2014}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2014}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2014}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 2.0, "year": 2014}, {"source": "6", "target": "51", "source_name": "natural products", "target_name": "functional groups", "weight": 1.0, "year": 2014}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2014}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2014}, {"source": "9", "target": "11", "source_name": "carbon monoxide", "target_name": "organic synthesis", "weight": 1.0, "year": 2014}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2014}, {"source": "9", "target": "20", "source_name": "carbon monoxide", "target_name": "organic chemistry", "weight": 2.0, "year": 2014}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2014}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2014}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2014}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2014}, {"source": "10", "target": "28", "source_name": "heck reaction", "target_name": "american chemical society", "weight": 1.0, "year": 2014}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2014}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2014}, {"source": "10", "target": "46", "source_name": "heck reaction", "target_name": "nobel prize", "weight": 1.0, "year": 2014}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2014}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2014}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2014}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 3.0, "year": 2014}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 2.0, "year": 2014}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2014}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2014}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2014}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2014}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2014}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2014}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2014}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2014}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2014}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2014}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2014}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2014}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2014}, {"source": "14", "target": "18", "source_name": "carboxylic acid", "target_name": "carbon dioxide", "weight": 1.0, "year": 2014}, {"source": "14", "target": "20", "source_name": "carboxylic acid", "target_name": "organic chemistry", "weight": 1.0, "year": 2014}, {"source": "14", "target": "22", "source_name": "carboxylic acid", "target_name": "aryl chlorides", "weight": 2.0, "year": 2014}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2014}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 2.0, "year": 2014}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2014}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2014}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2014}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2014}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2014}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 4.0, "year": 2014}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2014}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2014}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2014}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2014}, {"source": "18", "target": "20", "source_name": "carbon dioxide", "target_name": "organic chemistry", "weight": 1.0, "year": 2014}, {"source": "18", "target": "22", "source_name": "carbon dioxide", "target_name": "aryl chlorides", "weight": 1.0, "year": 2014}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2014}, {"source": "18", "target": "57", "source_name": "carbon dioxide", "target_name": "molecular oxygen", "weight": 1.0, "year": 2014}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2014}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2014}, {"source": "19", "target": "43", "source_name": "room temperature", "target_name": "transition metal", "weight": 1.0, "year": 2014}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2014}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2014}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 1.0, "year": 2014}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2014}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 1.0, "year": 2014}, {"source": "20", "target": "22", "source_name": "organic chemistry", "target_name": "aryl chlorides", "weight": 1.0, "year": 2014}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2014}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2014}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2014}, {"source": "20", "target": "57", "source_name": "organic chemistry", "target_name": "molecular oxygen", "weight": 1.0, "year": 2014}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2014}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2014}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2014}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2014}, {"source": "22", "target": "57", "source_name": "aryl chlorides", "target_name": "molecular oxygen", "weight": 1.0, "year": 2014}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2014}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2014}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2014}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2014}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2014}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 3.0, "year": 2014}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2014}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2014}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2014}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2014}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2014}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2014}, {"source": "26", "target": "51", "source_name": "complexing agent", "target_name": "functional groups", "weight": 1.0, "year": 2014}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 3.0, "year": 2014}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2014}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2014}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2014}, {"source": "28", "target": "46", "source_name": "american chemical society", "target_name": "nobel prize", "weight": 1.0, "year": 2014}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2014}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2014}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2014}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2014}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2014}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2014}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2014}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2014}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 2.0, "year": 2014}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2014}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 1.0, "year": 2014}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 1.0, "year": 2014}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2014}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2014}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2014}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 6.0, "year": 2014}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2014}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 3.0, "year": 2014}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2014}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2014}, {"source": "39", "target": "48", "source_name": "particle size", "target_name": "nitric acid", "weight": 1.0, "year": 2014}, {"source": "39", "target": "49", "source_name": "particle size", "target_name": "aqua regia", "weight": 1.0, "year": 2014}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2014}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2014}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2014}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2014}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2014}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2014}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2014}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2014}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 4.0, "year": 2014}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2014}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2014}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 2.0, "year": 2014}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2014}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2014}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2014}]}, {"2015": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 2.0, "year": 2015}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2015}, {"source": "2", "target": "23", "source_name": "reductive elimination", "target_name": "density functional theory", "weight": 1.0, "year": 2015}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 5.0, "year": 2015}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "2", "target": "45", "source_name": "reductive elimination", "target_name": "catalytic cycle", "weight": 1.0, "year": 2015}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2015}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2015}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2015}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 2.0, "year": 2015}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2015}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2015}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2015}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 14.0, "year": 2015}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2015}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 2.0, "year": 2015}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2015}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2015}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2015}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2015}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2015}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2015}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2015}, {"source": "6", "target": "15", "source_name": "natural products", "target_name": "drug discovery", "weight": 1.0, "year": 2015}, {"source": "6", "target": "20", "source_name": "natural products", "target_name": "organic chemistry", "weight": 1.0, "year": 2015}, {"source": "6", "target": "23", "source_name": "natural products", "target_name": "density functional theory", "weight": 1.0, "year": 2015}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 2.0, "year": 2015}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2015}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2015}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 2.0, "year": 2015}, {"source": "6", "target": "45", "source_name": "natural products", "target_name": "catalytic cycle", "weight": 1.0, "year": 2015}, {"source": "6", "target": "51", "source_name": "natural products", "target_name": "functional groups", "weight": 1.0, "year": 2015}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2015}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2015}, {"source": "9", "target": "11", "source_name": "carbon monoxide", "target_name": "organic synthesis", "weight": 1.0, "year": 2015}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2015}, {"source": "9", "target": "20", "source_name": "carbon monoxide", "target_name": "organic chemistry", "weight": 2.0, "year": 2015}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2015}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2015}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 1.0, "year": 2015}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2015}, {"source": "10", "target": "28", "source_name": "heck reaction", "target_name": "american chemical society", "weight": 1.0, "year": 2015}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2015}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2015}, {"source": "10", "target": "46", "source_name": "heck reaction", "target_name": "nobel prize", "weight": 1.0, "year": 2015}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2015}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2015}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2015}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 4.0, "year": 2015}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 2.0, "year": 2015}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2015}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2015}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2015}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2015}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2015}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2015}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2015}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2015}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2015}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2015}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2015}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2015}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2015}, {"source": "14", "target": "18", "source_name": "carboxylic acid", "target_name": "carbon dioxide", "weight": 1.0, "year": 2015}, {"source": "14", "target": "20", "source_name": "carboxylic acid", "target_name": "organic chemistry", "weight": 1.0, "year": 2015}, {"source": "14", "target": "22", "source_name": "carboxylic acid", "target_name": "aryl chlorides", "weight": 2.0, "year": 2015}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2015}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 2.0, "year": 2015}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2015}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2015}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2015}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2015}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2015}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 4.0, "year": 2015}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2015}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 2.0, "year": 2015}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2015}, {"source": "17", "target": "23", "source_name": "fuel cell", "target_name": "density functional theory", "weight": 1.0, "year": 2015}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2015}, {"source": "18", "target": "20", "source_name": "carbon dioxide", "target_name": "organic chemistry", "weight": 1.0, "year": 2015}, {"source": "18", "target": "22", "source_name": "carbon dioxide", "target_name": "aryl chlorides", "weight": 1.0, "year": 2015}, {"source": "18", "target": "43", "source_name": "carbon dioxide", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2015}, {"source": "18", "target": "55", "source_name": "carbon dioxide", "target_name": "ionic liquid", "weight": 1.0, "year": 2015}, {"source": "18", "target": "57", "source_name": "carbon dioxide", "target_name": "molecular oxygen", "weight": 1.0, "year": 2015}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2015}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2015}, {"source": "19", "target": "39", "source_name": "room temperature", "target_name": "particle size", "weight": 1.0, "year": 2015}, {"source": "19", "target": "43", "source_name": "room temperature", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2015}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2015}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 1.0, "year": 2015}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2015}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 2.0, "year": 2015}, {"source": "20", "target": "22", "source_name": "organic chemistry", "target_name": "aryl chlorides", "weight": 1.0, "year": 2015}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2015}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2015}, {"source": "20", "target": "57", "source_name": "organic chemistry", "target_name": "molecular oxygen", "weight": 1.0, "year": 2015}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2015}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2015}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2015}, {"source": "22", "target": "57", "source_name": "aryl chlorides", "target_name": "molecular oxygen", "weight": 1.0, "year": 2015}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "23", "target": "45", "source_name": "density functional theory", "target_name": "catalytic cycle", "weight": 1.0, "year": 2015}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2015}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2015}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2015}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2015}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 3.0, "year": 2015}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2015}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2015}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2015}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2015}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2015}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2015}, {"source": "26", "target": "51", "source_name": "complexing agent", "target_name": "functional groups", "weight": 1.0, "year": 2015}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 3.0, "year": 2015}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2015}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2015}, {"source": "28", "target": "46", "source_name": "american chemical society", "target_name": "nobel prize", "weight": 1.0, "year": 2015}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2015}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2015}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2015}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2015}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2015}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2015}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2015}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 2.0, "year": 2015}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2015}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 1.0, "year": 2015}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2015}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2015}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2015}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 7.0, "year": 2015}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2015}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 3.0, "year": 2015}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2015}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2015}, {"source": "39", "target": "48", "source_name": "particle size", "target_name": "nitric acid", "weight": 1.0, "year": 2015}, {"source": "39", "target": "49", "source_name": "particle size", "target_name": "aqua regia", "weight": 1.0, "year": 2015}, {"source": "39", "target": "55", "source_name": "particle size", "target_name": "ionic liquid", "weight": 1.0, "year": 2015}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2015}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2015}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2015}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2015}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2015}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2015}, {"source": "43", "target": "55", "source_name": "transition metal", "target_name": "ionic liquid", "weight": 1.0, "year": 2015}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2015}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2015}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 4.0, "year": 2015}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2015}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2015}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 2.0, "year": 2015}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2015}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2015}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2015}]}, {"2016": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 2.0, "year": 2016}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2016}, {"source": "2", "target": "23", "source_name": "reductive elimination", "target_name": "density functional theory", "weight": 1.0, "year": 2016}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 5.0, "year": 2016}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "2", "target": "45", "source_name": "reductive elimination", "target_name": "catalytic cycle", "weight": 1.0, "year": 2016}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2016}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2016}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2016}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 2.0, "year": 2016}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2016}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2016}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2016}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 14.0, "year": 2016}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2016}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 2.0, "year": 2016}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2016}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2016}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2016}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2016}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2016}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2016}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2016}, {"source": "6", "target": "15", "source_name": "natural products", "target_name": "drug discovery", "weight": 1.0, "year": 2016}, {"source": "6", "target": "20", "source_name": "natural products", "target_name": "organic chemistry", "weight": 1.0, "year": 2016}, {"source": "6", "target": "23", "source_name": "natural products", "target_name": "density functional theory", "weight": 1.0, "year": 2016}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 2.0, "year": 2016}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2016}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2016}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 2.0, "year": 2016}, {"source": "6", "target": "45", "source_name": "natural products", "target_name": "catalytic cycle", "weight": 1.0, "year": 2016}, {"source": "6", "target": "51", "source_name": "natural products", "target_name": "functional groups", "weight": 1.0, "year": 2016}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2016}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2016}, {"source": "9", "target": "11", "source_name": "carbon monoxide", "target_name": "organic synthesis", "weight": 1.0, "year": 2016}, {"source": "9", "target": "15", "source_name": "carbon monoxide", "target_name": "drug discovery", "weight": 1.0, "year": 2016}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2016}, {"source": "9", "target": "20", "source_name": "carbon monoxide", "target_name": "organic chemistry", "weight": 2.0, "year": 2016}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2016}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2016}, {"source": "9", "target": "51", "source_name": "carbon monoxide", "target_name": "functional groups", "weight": 1.0, "year": 2016}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 2.0, "year": 2016}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2016}, {"source": "10", "target": "28", "source_name": "heck reaction", "target_name": "american chemical society", "weight": 1.0, "year": 2016}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2016}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2016}, {"source": "10", "target": "46", "source_name": "heck reaction", "target_name": "nobel prize", "weight": 2.0, "year": 2016}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2016}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2016}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2016}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 4.0, "year": 2016}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 2.0, "year": 2016}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2016}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2016}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2016}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2016}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2016}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2016}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2016}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2016}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2016}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2016}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2016}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2016}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2016}, {"source": "14", "target": "18", "source_name": "carboxylic acid", "target_name": "carbon dioxide", "weight": 1.0, "year": 2016}, {"source": "14", "target": "20", "source_name": "carboxylic acid", "target_name": "organic chemistry", "weight": 1.0, "year": 2016}, {"source": "14", "target": "22", "source_name": "carboxylic acid", "target_name": "aryl chlorides", "weight": 2.0, "year": 2016}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2016}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 2.0, "year": 2016}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2016}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2016}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2016}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2016}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2016}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 4.0, "year": 2016}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2016}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 3.0, "year": 2016}, {"source": "15", "target": "51", "source_name": "drug discovery", "target_name": "functional groups", "weight": 1.0, "year": 2016}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2016}, {"source": "17", "target": "23", "source_name": "fuel cell", "target_name": "density functional theory", "weight": 1.0, "year": 2016}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2016}, {"source": "18", "target": "20", "source_name": "carbon dioxide", "target_name": "organic chemistry", "weight": 1.0, "year": 2016}, {"source": "18", "target": "22", "source_name": "carbon dioxide", "target_name": "aryl chlorides", "weight": 1.0, "year": 2016}, {"source": "18", "target": "43", "source_name": "carbon dioxide", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2016}, {"source": "18", "target": "55", "source_name": "carbon dioxide", "target_name": "ionic liquid", "weight": 1.0, "year": 2016}, {"source": "18", "target": "57", "source_name": "carbon dioxide", "target_name": "molecular oxygen", "weight": 1.0, "year": 2016}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 2.0, "year": 2016}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2016}, {"source": "19", "target": "39", "source_name": "room temperature", "target_name": "particle size", "weight": 2.0, "year": 2016}, {"source": "19", "target": "43", "source_name": "room temperature", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2016}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2016}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 2.0, "year": 2016}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2016}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 2.0, "year": 2016}, {"source": "20", "target": "22", "source_name": "organic chemistry", "target_name": "aryl chlorides", "weight": 1.0, "year": 2016}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2016}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2016}, {"source": "20", "target": "57", "source_name": "organic chemistry", "target_name": "molecular oxygen", "weight": 1.0, "year": 2016}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2016}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2016}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2016}, {"source": "22", "target": "57", "source_name": "aryl chlorides", "target_name": "molecular oxygen", "weight": 1.0, "year": 2016}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "23", "target": "45", "source_name": "density functional theory", "target_name": "catalytic cycle", "weight": 1.0, "year": 2016}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2016}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2016}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2016}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2016}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 4.0, "year": 2016}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2016}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2016}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2016}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2016}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2016}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2016}, {"source": "26", "target": "51", "source_name": "complexing agent", "target_name": "functional groups", "weight": 1.0, "year": 2016}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 3.0, "year": 2016}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2016}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2016}, {"source": "28", "target": "46", "source_name": "american chemical society", "target_name": "nobel prize", "weight": 1.0, "year": 2016}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2016}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 1.0, "year": 2016}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2016}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2016}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2016}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2016}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2016}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 2.0, "year": 2016}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2016}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 1.0, "year": 2016}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2016}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2016}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2016}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 8.0, "year": 2016}, {"source": "37", "target": "53", "source_name": "scanning electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2016}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2016}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 3.0, "year": 2016}, {"source": "38", "target": "53", "source_name": "electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2016}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2016}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2016}, {"source": "39", "target": "48", "source_name": "particle size", "target_name": "nitric acid", "weight": 1.0, "year": 2016}, {"source": "39", "target": "49", "source_name": "particle size", "target_name": "aqua regia", "weight": 1.0, "year": 2016}, {"source": "39", "target": "55", "source_name": "particle size", "target_name": "ionic liquid", "weight": 1.0, "year": 2016}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2016}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2016}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2016}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2016}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2016}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2016}, {"source": "43", "target": "55", "source_name": "transition metal", "target_name": "ionic liquid", "weight": 1.0, "year": 2016}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2016}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2016}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 4.0, "year": 2016}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2016}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 2.0, "year": 2016}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 2.0, "year": 2016}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2016}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2016}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2016}]}, {"2017": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 2.0, "year": 2017}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2017}, {"source": "2", "target": "23", "source_name": "reductive elimination", "target_name": "density functional theory", "weight": 2.0, "year": 2017}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 6.0, "year": 2017}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "2", "target": "45", "source_name": "reductive elimination", "target_name": "catalytic cycle", "weight": 2.0, "year": 2017}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2017}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2017}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2017}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 2.0, "year": 2017}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2017}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2017}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2017}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 15.0, "year": 2017}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2017}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 3.0, "year": 2017}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2017}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2017}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2017}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2017}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2017}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2017}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2017}, {"source": "6", "target": "15", "source_name": "natural products", "target_name": "drug discovery", "weight": 1.0, "year": 2017}, {"source": "6", "target": "20", "source_name": "natural products", "target_name": "organic chemistry", "weight": 1.0, "year": 2017}, {"source": "6", "target": "23", "source_name": "natural products", "target_name": "density functional theory", "weight": 1.0, "year": 2017}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 2.0, "year": 2017}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2017}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2017}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 2.0, "year": 2017}, {"source": "6", "target": "45", "source_name": "natural products", "target_name": "catalytic cycle", "weight": 1.0, "year": 2017}, {"source": "6", "target": "51", "source_name": "natural products", "target_name": "functional groups", "weight": 1.0, "year": 2017}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2017}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2017}, {"source": "9", "target": "11", "source_name": "carbon monoxide", "target_name": "organic synthesis", "weight": 1.0, "year": 2017}, {"source": "9", "target": "15", "source_name": "carbon monoxide", "target_name": "drug discovery", "weight": 1.0, "year": 2017}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2017}, {"source": "9", "target": "20", "source_name": "carbon monoxide", "target_name": "organic chemistry", "weight": 2.0, "year": 2017}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2017}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2017}, {"source": "9", "target": "51", "source_name": "carbon monoxide", "target_name": "functional groups", "weight": 1.0, "year": 2017}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 2.0, "year": 2017}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2017}, {"source": "10", "target": "28", "source_name": "heck reaction", "target_name": "american chemical society", "weight": 1.0, "year": 2017}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2017}, {"source": "10", "target": "37", "source_name": "heck reaction", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2017}, {"source": "10", "target": "38", "source_name": "heck reaction", "target_name": "electron microscopy", "weight": 1.0, "year": 2017}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2017}, {"source": "10", "target": "46", "source_name": "heck reaction", "target_name": "nobel prize", "weight": 2.0, "year": 2017}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2017}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2017}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2017}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 4.0, "year": 2017}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 2.0, "year": 2017}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2017}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2017}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2017}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2017}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2017}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2017}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2017}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2017}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2017}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2017}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2017}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2017}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2017}, {"source": "14", "target": "18", "source_name": "carboxylic acid", "target_name": "carbon dioxide", "weight": 1.0, "year": 2017}, {"source": "14", "target": "20", "source_name": "carboxylic acid", "target_name": "organic chemistry", "weight": 1.0, "year": 2017}, {"source": "14", "target": "22", "source_name": "carboxylic acid", "target_name": "aryl chlorides", "weight": 2.0, "year": 2017}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2017}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 2.0, "year": 2017}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2017}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2017}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2017}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2017}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2017}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 4.0, "year": 2017}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2017}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 3.0, "year": 2017}, {"source": "15", "target": "51", "source_name": "drug discovery", "target_name": "functional groups", "weight": 1.0, "year": 2017}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2017}, {"source": "17", "target": "23", "source_name": "fuel cell", "target_name": "density functional theory", "weight": 1.0, "year": 2017}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2017}, {"source": "18", "target": "20", "source_name": "carbon dioxide", "target_name": "organic chemistry", "weight": 1.0, "year": 2017}, {"source": "18", "target": "22", "source_name": "carbon dioxide", "target_name": "aryl chlorides", "weight": 1.0, "year": 2017}, {"source": "18", "target": "43", "source_name": "carbon dioxide", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2017}, {"source": "18", "target": "55", "source_name": "carbon dioxide", "target_name": "ionic liquid", "weight": 1.0, "year": 2017}, {"source": "18", "target": "57", "source_name": "carbon dioxide", "target_name": "molecular oxygen", "weight": 1.0, "year": 2017}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 2.0, "year": 2017}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2017}, {"source": "19", "target": "39", "source_name": "room temperature", "target_name": "particle size", "weight": 2.0, "year": 2017}, {"source": "19", "target": "43", "source_name": "room temperature", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2017}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2017}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 2.0, "year": 2017}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2017}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 2.0, "year": 2017}, {"source": "20", "target": "22", "source_name": "organic chemistry", "target_name": "aryl chlorides", "weight": 1.0, "year": 2017}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2017}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2017}, {"source": "20", "target": "53", "source_name": "organic chemistry", "target_name": "boronic acids", "weight": 1.0, "year": 2017}, {"source": "20", "target": "57", "source_name": "organic chemistry", "target_name": "molecular oxygen", "weight": 1.0, "year": 2017}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 1.0, "year": 2017}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2017}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 1.0, "year": 2017}, {"source": "22", "target": "57", "source_name": "aryl chlorides", "target_name": "molecular oxygen", "weight": 1.0, "year": 2017}, {"source": "23", "target": "31", "source_name": "density functional theory", "target_name": "oxidative addition", "weight": 1.0, "year": 2017}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "23", "target": "45", "source_name": "density functional theory", "target_name": "catalytic cycle", "weight": 2.0, "year": 2017}, {"source": "23", "target": "47", "source_name": "density functional theory", "target_name": "formic acid", "weight": 1.0, "year": 2017}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2017}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2017}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2017}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2017}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 4.0, "year": 2017}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2017}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2017}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2017}, {"source": "26", "target": "34", "source_name": "complexing agent", "target_name": "aqueous solution", "weight": 1.0, "year": 2017}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2017}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2017}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2017}, {"source": "26", "target": "51", "source_name": "complexing agent", "target_name": "functional groups", "weight": 1.0, "year": 2017}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 4.0, "year": 2017}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2017}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2017}, {"source": "28", "target": "46", "source_name": "american chemical society", "target_name": "nobel prize", "weight": 1.0, "year": 2017}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2017}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 2.0, "year": 2017}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2017}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2017}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2017}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2017}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 1.0, "year": 2017}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 3.0, "year": 2017}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2017}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 1.0, "year": 2017}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2017}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2017}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2017}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 9.0, "year": 2017}, {"source": "37", "target": "53", "source_name": "scanning electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2017}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2017}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 4.0, "year": 2017}, {"source": "38", "target": "53", "source_name": "electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2017}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2017}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2017}, {"source": "39", "target": "48", "source_name": "particle size", "target_name": "nitric acid", "weight": 1.0, "year": 2017}, {"source": "39", "target": "49", "source_name": "particle size", "target_name": "aqua regia", "weight": 1.0, "year": 2017}, {"source": "39", "target": "55", "source_name": "particle size", "target_name": "ionic liquid", "weight": 1.0, "year": 2017}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2017}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 1.0, "year": 2017}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2017}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2017}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2017}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2017}, {"source": "43", "target": "53", "source_name": "transition metal", "target_name": "boronic acids", "weight": 1.0, "year": 2017}, {"source": "43", "target": "55", "source_name": "transition metal", "target_name": "ionic liquid", "weight": 1.0, "year": 2017}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2017}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2017}, {"source": "46", "target": "51", "source_name": "nobel prize", "target_name": "functional groups", "weight": 1.0, "year": 2017}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 5.0, "year": 2017}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2017}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 2.0, "year": 2017}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 2.0, "year": 2017}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2017}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2017}, {"source": "51", "target": "54", "source_name": "functional groups", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2017}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2017}]}, {"2018": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 2.0, "year": 2018}, {"source": "2", "target": "9", "source_name": "reductive elimination", "target_name": "carbon monoxide", "weight": 1.0, "year": 2018}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2018}, {"source": "2", "target": "23", "source_name": "reductive elimination", "target_name": "density functional theory", "weight": 2.0, "year": 2018}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 6.0, "year": 2018}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2018}, {"source": "2", "target": "45", "source_name": "reductive elimination", "target_name": "catalytic cycle", "weight": 2.0, "year": 2018}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2018}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2018}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2018}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 2.0, "year": 2018}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2018}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2018}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2018}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 15.0, "year": 2018}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2018}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 3.0, "year": 2018}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2018}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2018}, {"source": "5", "target": "13", "source_name": "crystal structure", "target_name": "single crystal", "weight": 1.0, "year": 2018}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2018}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2018}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2018}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2018}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 1.0, "year": 2018}, {"source": "6", "target": "15", "source_name": "natural products", "target_name": "drug discovery", "weight": 1.0, "year": 2018}, {"source": "6", "target": "20", "source_name": "natural products", "target_name": "organic chemistry", "weight": 2.0, "year": 2018}, {"source": "6", "target": "23", "source_name": "natural products", "target_name": "density functional theory", "weight": 1.0, "year": 2018}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 2.0, "year": 2018}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2018}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2018}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 2.0, "year": 2018}, {"source": "6", "target": "45", "source_name": "natural products", "target_name": "catalytic cycle", "weight": 1.0, "year": 2018}, {"source": "6", "target": "51", "source_name": "natural products", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2018}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2018}, {"source": "9", "target": "11", "source_name": "carbon monoxide", "target_name": "organic synthesis", "weight": 1.0, "year": 2018}, {"source": "9", "target": "15", "source_name": "carbon monoxide", "target_name": "drug discovery", "weight": 1.0, "year": 2018}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2018}, {"source": "9", "target": "20", "source_name": "carbon monoxide", "target_name": "organic chemistry", "weight": 2.0, "year": 2018}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2018}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2018}, {"source": "9", "target": "51", "source_name": "carbon monoxide", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 2.0, "year": 2018}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2018}, {"source": "10", "target": "28", "source_name": "heck reaction", "target_name": "american chemical society", "weight": 1.0, "year": 2018}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2018}, {"source": "10", "target": "37", "source_name": "heck reaction", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2018}, {"source": "10", "target": "38", "source_name": "heck reaction", "target_name": "electron microscopy", "weight": 1.0, "year": 2018}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2018}, {"source": "10", "target": "46", "source_name": "heck reaction", "target_name": "nobel prize", "weight": 2.0, "year": 2018}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2018}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2018}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2018}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 4.0, "year": 2018}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 2.0, "year": 2018}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2018}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2018}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2018}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2018}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2018}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2018}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2018}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2018}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2018}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2018}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2018}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2018}, {"source": "14", "target": "18", "source_name": "carboxylic acid", "target_name": "carbon dioxide", "weight": 1.0, "year": 2018}, {"source": "14", "target": "20", "source_name": "carboxylic acid", "target_name": "organic chemistry", "weight": 1.0, "year": 2018}, {"source": "14", "target": "22", "source_name": "carboxylic acid", "target_name": "aryl chlorides", "weight": 2.0, "year": 2018}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2018}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 2.0, "year": 2018}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2018}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2018}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2018}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2018}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 4.0, "year": 2018}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2018}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 3.0, "year": 2018}, {"source": "15", "target": "51", "source_name": "drug discovery", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2018}, {"source": "17", "target": "23", "source_name": "fuel cell", "target_name": "density functional theory", "weight": 1.0, "year": 2018}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2018}, {"source": "18", "target": "20", "source_name": "carbon dioxide", "target_name": "organic chemistry", "weight": 1.0, "year": 2018}, {"source": "18", "target": "22", "source_name": "carbon dioxide", "target_name": "aryl chlorides", "weight": 1.0, "year": 2018}, {"source": "18", "target": "43", "source_name": "carbon dioxide", "target_name": "transition metal", "weight": 1.0, "year": 2018}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2018}, {"source": "18", "target": "55", "source_name": "carbon dioxide", "target_name": "ionic liquid", "weight": 1.0, "year": 2018}, {"source": "18", "target": "57", "source_name": "carbon dioxide", "target_name": "molecular oxygen", "weight": 1.0, "year": 2018}, {"source": "19", "target": "21", "source_name": "room temperature", "target_name": "green chemistry", "weight": 1.0, "year": 2018}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 2.0, "year": 2018}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2018}, {"source": "19", "target": "39", "source_name": "room temperature", "target_name": "particle size", "weight": 2.0, "year": 2018}, {"source": "19", "target": "43", "source_name": "room temperature", "target_name": "transition metal", "weight": 1.0, "year": 2018}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2018}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2018}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 2.0, "year": 2018}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2018}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 3.0, "year": 2018}, {"source": "20", "target": "22", "source_name": "organic chemistry", "target_name": "aryl chlorides", "weight": 1.0, "year": 2018}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2018}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2018}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2018}, {"source": "20", "target": "53", "source_name": "organic chemistry", "target_name": "boronic acids", "weight": 1.0, "year": 2018}, {"source": "20", "target": "57", "source_name": "organic chemistry", "target_name": "molecular oxygen", "weight": 1.0, "year": 2018}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2018}, {"source": "21", "target": "51", "source_name": "green chemistry", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "21", "target": "52", "source_name": "green chemistry", "target_name": "reducing agent", "weight": 1.0, "year": 2018}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 2.0, "year": 2018}, {"source": "22", "target": "36", "source_name": "aryl chlorides", "target_name": "oxidation state", "weight": 1.0, "year": 2018}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2018}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 2.0, "year": 2018}, {"source": "22", "target": "57", "source_name": "aryl chlorides", "target_name": "molecular oxygen", "weight": 1.0, "year": 2018}, {"source": "23", "target": "31", "source_name": "density functional theory", "target_name": "oxidative addition", "weight": 1.0, "year": 2018}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2018}, {"source": "23", "target": "45", "source_name": "density functional theory", "target_name": "catalytic cycle", "weight": 2.0, "year": 2018}, {"source": "23", "target": "47", "source_name": "density functional theory", "target_name": "formic acid", "weight": 1.0, "year": 2018}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2018}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2018}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2018}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2018}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 4.0, "year": 2018}, {"source": "24", "target": "49", "source_name": "hydrochloric acid", "target_name": "aqua regia", "weight": 1.0, "year": 2018}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2018}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2018}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2018}, {"source": "26", "target": "34", "source_name": "complexing agent", "target_name": "aqueous solution", "weight": 1.0, "year": 2018}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2018}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2018}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2018}, {"source": "26", "target": "51", "source_name": "complexing agent", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 4.0, "year": 2018}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 1.0, "year": 2018}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2018}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2018}, {"source": "28", "target": "46", "source_name": "american chemical society", "target_name": "nobel prize", "weight": 1.0, "year": 2018}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2018}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 2.0, "year": 2018}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 2.0, "year": 2018}, {"source": "31", "target": "51", "source_name": "oxidative addition", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2018}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2018}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2018}, {"source": "34", "target": "37", "source_name": "aqueous solution", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2018}, {"source": "34", "target": "38", "source_name": "aqueous solution", "target_name": "electron microscopy", "weight": 1.0, "year": 2018}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2018}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 2.0, "year": 2018}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 3.0, "year": 2018}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2018}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 1.0, "year": 2018}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 2.0, "year": 2018}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2018}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2018}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2018}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 11.0, "year": 2018}, {"source": "37", "target": "53", "source_name": "scanning electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2018}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2018}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 4.0, "year": 2018}, {"source": "38", "target": "53", "source_name": "electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2018}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2018}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2018}, {"source": "39", "target": "48", "source_name": "particle size", "target_name": "nitric acid", "weight": 1.0, "year": 2018}, {"source": "39", "target": "49", "source_name": "particle size", "target_name": "aqua regia", "weight": 1.0, "year": 2018}, {"source": "39", "target": "55", "source_name": "particle size", "target_name": "ionic liquid", "weight": 1.0, "year": 2018}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2018}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 2.0, "year": 2018}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2018}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2018}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2018}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2018}, {"source": "43", "target": "51", "source_name": "transition metal", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "43", "target": "53", "source_name": "transition metal", "target_name": "boronic acids", "weight": 1.0, "year": 2018}, {"source": "43", "target": "55", "source_name": "transition metal", "target_name": "ionic liquid", "weight": 1.0, "year": 2018}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2018}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2018}, {"source": "46", "target": "51", "source_name": "nobel prize", "target_name": "functional groups", "weight": 1.0, "year": 2018}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 5.0, "year": 2018}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2018}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 2.0, "year": 2018}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 2.0, "year": 2018}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2018}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2018}, {"source": "51", "target": "52", "source_name": "functional groups", "target_name": "reducing agent", "weight": 1.0, "year": 2018}, {"source": "51", "target": "54", "source_name": "functional groups", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2018}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2018}]}, {"2019": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 2.0, "year": 2019}, {"source": "2", "target": "9", "source_name": "reductive elimination", "target_name": "carbon monoxide", "weight": 1.0, "year": 2019}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2019}, {"source": "2", "target": "23", "source_name": "reductive elimination", "target_name": "density functional theory", "weight": 2.0, "year": 2019}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 6.0, "year": 2019}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2019}, {"source": "2", "target": "45", "source_name": "reductive elimination", "target_name": "catalytic cycle", "weight": 2.0, "year": 2019}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2019}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2019}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2019}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 2.0, "year": 2019}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2019}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2019}, {"source": "3", "target": "36", "source_name": "transmission electron microscopy", "target_name": "oxidation state", "weight": 1.0, "year": 2019}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2019}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 16.0, "year": 2019}, {"source": "3", "target": "39", "source_name": "transmission electron microscopy", "target_name": "particle size", "weight": 1.0, "year": 2019}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2019}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 3.0, "year": 2019}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2019}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2019}, {"source": "5", "target": "13", "source_name": "crystal structure", "target_name": "single crystal", "weight": 1.0, "year": 2019}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2019}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2019}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2019}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2019}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 2.0, "year": 2019}, {"source": "6", "target": "15", "source_name": "natural products", "target_name": "drug discovery", "weight": 2.0, "year": 2019}, {"source": "6", "target": "20", "source_name": "natural products", "target_name": "organic chemistry", "weight": 2.0, "year": 2019}, {"source": "6", "target": "23", "source_name": "natural products", "target_name": "density functional theory", "weight": 1.0, "year": 2019}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 4.0, "year": 2019}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2019}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2019}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 3.0, "year": 2019}, {"source": "6", "target": "45", "source_name": "natural products", "target_name": "catalytic cycle", "weight": 1.0, "year": 2019}, {"source": "6", "target": "51", "source_name": "natural products", "target_name": "functional groups", "weight": 2.0, "year": 2019}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2019}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2019}, {"source": "9", "target": "11", "source_name": "carbon monoxide", "target_name": "organic synthesis", "weight": 1.0, "year": 2019}, {"source": "9", "target": "15", "source_name": "carbon monoxide", "target_name": "drug discovery", "weight": 1.0, "year": 2019}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2019}, {"source": "9", "target": "20", "source_name": "carbon monoxide", "target_name": "organic chemistry", "weight": 2.0, "year": 2019}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2019}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 1.0, "year": 2019}, {"source": "9", "target": "51", "source_name": "carbon monoxide", "target_name": "functional groups", "weight": 1.0, "year": 2019}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 2.0, "year": 2019}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2019}, {"source": "10", "target": "28", "source_name": "heck reaction", "target_name": "american chemical society", "weight": 1.0, "year": 2019}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2019}, {"source": "10", "target": "37", "source_name": "heck reaction", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2019}, {"source": "10", "target": "38", "source_name": "heck reaction", "target_name": "electron microscopy", "weight": 1.0, "year": 2019}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2019}, {"source": "10", "target": "46", "source_name": "heck reaction", "target_name": "nobel prize", "weight": 2.0, "year": 2019}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2019}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2019}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2019}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 5.0, "year": 2019}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 3.0, "year": 2019}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2019}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2019}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2019}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2019}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2019}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2019}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2019}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2019}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2019}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2019}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2019}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2019}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2019}, {"source": "14", "target": "18", "source_name": "carboxylic acid", "target_name": "carbon dioxide", "weight": 1.0, "year": 2019}, {"source": "14", "target": "20", "source_name": "carboxylic acid", "target_name": "organic chemistry", "weight": 1.0, "year": 2019}, {"source": "14", "target": "22", "source_name": "carboxylic acid", "target_name": "aryl chlorides", "weight": 2.0, "year": 2019}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2019}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 2.0, "year": 2019}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2019}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2019}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2019}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2019}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2019}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 4.0, "year": 2019}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2019}, {"source": "15", "target": "27", "source_name": "drug discovery", "target_name": "biologically active", "weight": 1.0, "year": 2019}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 3.0, "year": 2019}, {"source": "15", "target": "51", "source_name": "drug discovery", "target_name": "functional groups", "weight": 2.0, "year": 2019}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2019}, {"source": "17", "target": "23", "source_name": "fuel cell", "target_name": "density functional theory", "weight": 1.0, "year": 2019}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2019}, {"source": "18", "target": "20", "source_name": "carbon dioxide", "target_name": "organic chemistry", "weight": 1.0, "year": 2019}, {"source": "18", "target": "22", "source_name": "carbon dioxide", "target_name": "aryl chlorides", "weight": 1.0, "year": 2019}, {"source": "18", "target": "43", "source_name": "carbon dioxide", "target_name": "transition metal", "weight": 1.0, "year": 2019}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2019}, {"source": "18", "target": "55", "source_name": "carbon dioxide", "target_name": "ionic liquid", "weight": 1.0, "year": 2019}, {"source": "18", "target": "57", "source_name": "carbon dioxide", "target_name": "molecular oxygen", "weight": 1.0, "year": 2019}, {"source": "19", "target": "21", "source_name": "room temperature", "target_name": "green chemistry", "weight": 1.0, "year": 2019}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 2.0, "year": 2019}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2019}, {"source": "19", "target": "39", "source_name": "room temperature", "target_name": "particle size", "weight": 2.0, "year": 2019}, {"source": "19", "target": "43", "source_name": "room temperature", "target_name": "transition metal", "weight": 1.0, "year": 2019}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2019}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2019}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 2.0, "year": 2019}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2019}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 3.0, "year": 2019}, {"source": "20", "target": "22", "source_name": "organic chemistry", "target_name": "aryl chlorides", "weight": 1.0, "year": 2019}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2019}, {"source": "20", "target": "38", "source_name": "organic chemistry", "target_name": "electron microscopy", "weight": 1.0, "year": 2019}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2019}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2019}, {"source": "20", "target": "53", "source_name": "organic chemistry", "target_name": "boronic acids", "weight": 1.0, "year": 2019}, {"source": "20", "target": "57", "source_name": "organic chemistry", "target_name": "molecular oxygen", "weight": 1.0, "year": 2019}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2019}, {"source": "21", "target": "51", "source_name": "green chemistry", "target_name": "functional groups", "weight": 1.0, "year": 2019}, {"source": "21", "target": "52", "source_name": "green chemistry", "target_name": "reducing agent", "weight": 1.0, "year": 2019}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 2.0, "year": 2019}, {"source": "22", "target": "36", "source_name": "aryl chlorides", "target_name": "oxidation state", "weight": 1.0, "year": 2019}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2019}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 2.0, "year": 2019}, {"source": "22", "target": "57", "source_name": "aryl chlorides", "target_name": "molecular oxygen", "weight": 1.0, "year": 2019}, {"source": "23", "target": "31", "source_name": "density functional theory", "target_name": "oxidative addition", "weight": 1.0, "year": 2019}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2019}, {"source": "23", "target": "45", "source_name": "density functional theory", "target_name": "catalytic cycle", "weight": 2.0, "year": 2019}, {"source": "23", "target": "47", "source_name": "density functional theory", "target_name": "formic acid", "weight": 1.0, "year": 2019}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2019}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2019}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2019}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2019}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 4.0, "year": 2019}, {"source": "24", "target": "49", "source_name": "hydrochloric acid", "target_name": "aqua regia", "weight": 1.0, "year": 2019}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2019}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2019}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2019}, {"source": "26", "target": "34", "source_name": "complexing agent", "target_name": "aqueous solution", "weight": 1.0, "year": 2019}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2019}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2019}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2019}, {"source": "26", "target": "51", "source_name": "complexing agent", "target_name": "functional groups", "weight": 1.0, "year": 2019}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 4.0, "year": 2019}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 2.0, "year": 2019}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2019}, {"source": "27", "target": "51", "source_name": "biologically active", "target_name": "functional groups", "weight": 1.0, "year": 2019}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2019}, {"source": "28", "target": "46", "source_name": "american chemical society", "target_name": "nobel prize", "weight": 1.0, "year": 2019}, {"source": "28", "target": "48", "source_name": "american chemical society", "target_name": "nitric acid", "weight": 1.0, "year": 2019}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2019}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 2.0, "year": 2019}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 2.0, "year": 2019}, {"source": "31", "target": "51", "source_name": "oxidative addition", "target_name": "functional groups", "weight": 1.0, "year": 2019}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2019}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2019}, {"source": "32", "target": "43", "source_name": "detection limit", "target_name": "transition metal", "weight": 1.0, "year": 2019}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2019}, {"source": "34", "target": "37", "source_name": "aqueous solution", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2019}, {"source": "34", "target": "38", "source_name": "aqueous solution", "target_name": "electron microscopy", "weight": 1.0, "year": 2019}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2019}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 2.0, "year": 2019}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 3.0, "year": 2019}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2019}, {"source": "36", "target": "38", "source_name": "oxidation state", "target_name": "electron microscopy", "weight": 1.0, "year": 2019}, {"source": "36", "target": "39", "source_name": "oxidation state", "target_name": "particle size", "weight": 1.0, "year": 2019}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 1.0, "year": 2019}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 2.0, "year": 2019}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2019}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2019}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2019}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 11.0, "year": 2019}, {"source": "37", "target": "53", "source_name": "scanning electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2019}, {"source": "38", "target": "39", "source_name": "electron microscopy", "target_name": "particle size", "weight": 1.0, "year": 2019}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2019}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 4.0, "year": 2019}, {"source": "38", "target": "53", "source_name": "electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2019}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2019}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2019}, {"source": "39", "target": "48", "source_name": "particle size", "target_name": "nitric acid", "weight": 1.0, "year": 2019}, {"source": "39", "target": "49", "source_name": "particle size", "target_name": "aqua regia", "weight": 1.0, "year": 2019}, {"source": "39", "target": "55", "source_name": "particle size", "target_name": "ionic liquid", "weight": 1.0, "year": 2019}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2019}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 2.0, "year": 2019}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2019}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2019}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2019}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2019}, {"source": "43", "target": "51", "source_name": "transition metal", "target_name": "functional groups", "weight": 1.0, "year": 2019}, {"source": "43", "target": "53", "source_name": "transition metal", "target_name": "boronic acids", "weight": 1.0, "year": 2019}, {"source": "43", "target": "55", "source_name": "transition metal", "target_name": "ionic liquid", "weight": 1.0, "year": 2019}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2019}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2019}, {"source": "46", "target": "51", "source_name": "nobel prize", "target_name": "functional groups", "weight": 1.0, "year": 2019}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 5.0, "year": 2019}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2019}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 2.0, "year": 2019}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 2.0, "year": 2019}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2019}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2019}, {"source": "51", "target": "52", "source_name": "functional groups", "target_name": "reducing agent", "weight": 1.0, "year": 2019}, {"source": "51", "target": "54", "source_name": "functional groups", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2019}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2019}]}, {"2020": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 2.0, "year": 2020}, {"source": "2", "target": "9", "source_name": "reductive elimination", "target_name": "carbon monoxide", "weight": 1.0, "year": 2020}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2020}, {"source": "2", "target": "23", "source_name": "reductive elimination", "target_name": "density functional theory", "weight": 2.0, "year": 2020}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 6.0, "year": 2020}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2020}, {"source": "2", "target": "45", "source_name": "reductive elimination", "target_name": "catalytic cycle", "weight": 2.0, "year": 2020}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2020}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2020}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2020}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 2.0, "year": 2020}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2020}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2020}, {"source": "3", "target": "36", "source_name": "transmission electron microscopy", "target_name": "oxidation state", "weight": 1.0, "year": 2020}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2020}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 16.0, "year": 2020}, {"source": "3", "target": "39", "source_name": "transmission electron microscopy", "target_name": "particle size", "weight": 1.0, "year": 2020}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2020}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 3.0, "year": 2020}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2020}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2020}, {"source": "5", "target": "13", "source_name": "crystal structure", "target_name": "single crystal", "weight": 1.0, "year": 2020}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2020}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2020}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2020}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2020}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 2.0, "year": 2020}, {"source": "6", "target": "15", "source_name": "natural products", "target_name": "drug discovery", "weight": 2.0, "year": 2020}, {"source": "6", "target": "20", "source_name": "natural products", "target_name": "organic chemistry", "weight": 2.0, "year": 2020}, {"source": "6", "target": "23", "source_name": "natural products", "target_name": "density functional theory", "weight": 1.0, "year": 2020}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 4.0, "year": 2020}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2020}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2020}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 3.0, "year": 2020}, {"source": "6", "target": "45", "source_name": "natural products", "target_name": "catalytic cycle", "weight": 1.0, "year": 2020}, {"source": "6", "target": "51", "source_name": "natural products", "target_name": "functional groups", "weight": 2.0, "year": 2020}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2020}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2020}, {"source": "9", "target": "11", "source_name": "carbon monoxide", "target_name": "organic synthesis", "weight": 1.0, "year": 2020}, {"source": "9", "target": "15", "source_name": "carbon monoxide", "target_name": "drug discovery", "weight": 1.0, "year": 2020}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2020}, {"source": "9", "target": "20", "source_name": "carbon monoxide", "target_name": "organic chemistry", "weight": 2.0, "year": 2020}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2020}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 2.0, "year": 2020}, {"source": "9", "target": "51", "source_name": "carbon monoxide", "target_name": "functional groups", "weight": 1.0, "year": 2020}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 2.0, "year": 2020}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2020}, {"source": "10", "target": "28", "source_name": "heck reaction", "target_name": "american chemical society", "weight": 1.0, "year": 2020}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2020}, {"source": "10", "target": "37", "source_name": "heck reaction", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2020}, {"source": "10", "target": "38", "source_name": "heck reaction", "target_name": "electron microscopy", "weight": 1.0, "year": 2020}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2020}, {"source": "10", "target": "46", "source_name": "heck reaction", "target_name": "nobel prize", "weight": 2.0, "year": 2020}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2020}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2020}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2020}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 6.0, "year": 2020}, {"source": "11", "target": "23", "source_name": "organic synthesis", "target_name": "density functional theory", "weight": 1.0, "year": 2020}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 3.0, "year": 2020}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2020}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2020}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2020}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2020}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2020}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2020}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2020}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2020}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2020}, {"source": "12", "target": "59", "source_name": "quit attempts", "target_name": "african american", "weight": 1.0, "year": 2020}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2020}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2020}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2020}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2020}, {"source": "14", "target": "18", "source_name": "carboxylic acid", "target_name": "carbon dioxide", "weight": 1.0, "year": 2020}, {"source": "14", "target": "20", "source_name": "carboxylic acid", "target_name": "organic chemistry", "weight": 1.0, "year": 2020}, {"source": "14", "target": "22", "source_name": "carboxylic acid", "target_name": "aryl chlorides", "weight": 2.0, "year": 2020}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2020}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 2.0, "year": 2020}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2020}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2020}, {"source": "14", "target": "45", "source_name": "carboxylic acid", "target_name": "catalytic cycle", "weight": 1.0, "year": 2020}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2020}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2020}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2020}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 4.0, "year": 2020}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2020}, {"source": "15", "target": "27", "source_name": "drug discovery", "target_name": "biologically active", "weight": 1.0, "year": 2020}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 3.0, "year": 2020}, {"source": "15", "target": "51", "source_name": "drug discovery", "target_name": "functional groups", "weight": 3.0, "year": 2020}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2020}, {"source": "17", "target": "23", "source_name": "fuel cell", "target_name": "density functional theory", "weight": 1.0, "year": 2020}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2020}, {"source": "18", "target": "20", "source_name": "carbon dioxide", "target_name": "organic chemistry", "weight": 1.0, "year": 2020}, {"source": "18", "target": "22", "source_name": "carbon dioxide", "target_name": "aryl chlorides", "weight": 1.0, "year": 2020}, {"source": "18", "target": "34", "source_name": "carbon dioxide", "target_name": "aqueous solution", "weight": 1.0, "year": 2020}, {"source": "18", "target": "43", "source_name": "carbon dioxide", "target_name": "transition metal", "weight": 1.0, "year": 2020}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2020}, {"source": "18", "target": "55", "source_name": "carbon dioxide", "target_name": "ionic liquid", "weight": 1.0, "year": 2020}, {"source": "18", "target": "57", "source_name": "carbon dioxide", "target_name": "molecular oxygen", "weight": 1.0, "year": 2020}, {"source": "19", "target": "21", "source_name": "room temperature", "target_name": "green chemistry", "weight": 1.0, "year": 2020}, {"source": "19", "target": "22", "source_name": "room temperature", "target_name": "aryl chlorides", "weight": 1.0, "year": 2020}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 2.0, "year": 2020}, {"source": "19", "target": "31", "source_name": "room temperature", "target_name": "oxidative addition", "weight": 1.0, "year": 2020}, {"source": "19", "target": "37", "source_name": "room temperature", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2020}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2020}, {"source": "19", "target": "39", "source_name": "room temperature", "target_name": "particle size", "weight": 2.0, "year": 2020}, {"source": "19", "target": "43", "source_name": "room temperature", "target_name": "transition metal", "weight": 1.0, "year": 2020}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2020}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2020}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 2.0, "year": 2020}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2020}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 3.0, "year": 2020}, {"source": "20", "target": "22", "source_name": "organic chemistry", "target_name": "aryl chlorides", "weight": 1.0, "year": 2020}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2020}, {"source": "20", "target": "33", "source_name": "organic chemistry", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2020}, {"source": "20", "target": "38", "source_name": "organic chemistry", "target_name": "electron microscopy", "weight": 1.0, "year": 2020}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 2.0, "year": 2020}, {"source": "20", "target": "45", "source_name": "organic chemistry", "target_name": "catalytic cycle", "weight": 1.0, "year": 2020}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2020}, {"source": "20", "target": "53", "source_name": "organic chemistry", "target_name": "boronic acids", "weight": 1.0, "year": 2020}, {"source": "20", "target": "57", "source_name": "organic chemistry", "target_name": "molecular oxygen", "weight": 2.0, "year": 2020}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2020}, {"source": "21", "target": "51", "source_name": "green chemistry", "target_name": "functional groups", "weight": 1.0, "year": 2020}, {"source": "21", "target": "52", "source_name": "green chemistry", "target_name": "reducing agent", "weight": 1.0, "year": 2020}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 2.0, "year": 2020}, {"source": "22", "target": "36", "source_name": "aryl chlorides", "target_name": "oxidation state", "weight": 1.0, "year": 2020}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2020}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 2.0, "year": 2020}, {"source": "22", "target": "57", "source_name": "aryl chlorides", "target_name": "molecular oxygen", "weight": 1.0, "year": 2020}, {"source": "23", "target": "31", "source_name": "density functional theory", "target_name": "oxidative addition", "weight": 1.0, "year": 2020}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 1.0, "year": 2020}, {"source": "23", "target": "45", "source_name": "density functional theory", "target_name": "catalytic cycle", "weight": 2.0, "year": 2020}, {"source": "23", "target": "47", "source_name": "density functional theory", "target_name": "formic acid", "weight": 1.0, "year": 2020}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2020}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2020}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2020}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2020}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 4.0, "year": 2020}, {"source": "24", "target": "49", "source_name": "hydrochloric acid", "target_name": "aqua regia", "weight": 1.0, "year": 2020}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2020}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2020}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2020}, {"source": "26", "target": "34", "source_name": "complexing agent", "target_name": "aqueous solution", "weight": 1.0, "year": 2020}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2020}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2020}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2020}, {"source": "26", "target": "51", "source_name": "complexing agent", "target_name": "functional groups", "weight": 1.0, "year": 2020}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 4.0, "year": 2020}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 2.0, "year": 2020}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2020}, {"source": "27", "target": "51", "source_name": "biologically active", "target_name": "functional groups", "weight": 1.0, "year": 2020}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2020}, {"source": "28", "target": "46", "source_name": "american chemical society", "target_name": "nobel prize", "weight": 1.0, "year": 2020}, {"source": "28", "target": "48", "source_name": "american chemical society", "target_name": "nitric acid", "weight": 1.0, "year": 2020}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2020}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 2.0, "year": 2020}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 2.0, "year": 2020}, {"source": "31", "target": "51", "source_name": "oxidative addition", "target_name": "functional groups", "weight": 1.0, "year": 2020}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2020}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2020}, {"source": "32", "target": "34", "source_name": "detection limit", "target_name": "aqueous solution", "weight": 1.0, "year": 2020}, {"source": "32", "target": "43", "source_name": "detection limit", "target_name": "transition metal", "weight": 1.0, "year": 2020}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2020}, {"source": "34", "target": "37", "source_name": "aqueous solution", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2020}, {"source": "34", "target": "38", "source_name": "aqueous solution", "target_name": "electron microscopy", "weight": 1.0, "year": 2020}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2020}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 3.0, "year": 2020}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 3.0, "year": 2020}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2020}, {"source": "36", "target": "38", "source_name": "oxidation state", "target_name": "electron microscopy", "weight": 1.0, "year": 2020}, {"source": "36", "target": "39", "source_name": "oxidation state", "target_name": "particle size", "weight": 1.0, "year": 2020}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 2.0, "year": 2020}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 2.0, "year": 2020}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2020}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2020}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2020}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 11.0, "year": 2020}, {"source": "37", "target": "53", "source_name": "scanning electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2020}, {"source": "38", "target": "39", "source_name": "electron microscopy", "target_name": "particle size", "weight": 1.0, "year": 2020}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2020}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 4.0, "year": 2020}, {"source": "38", "target": "53", "source_name": "electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2020}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 2.0, "year": 2020}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2020}, {"source": "39", "target": "48", "source_name": "particle size", "target_name": "nitric acid", "weight": 1.0, "year": 2020}, {"source": "39", "target": "49", "source_name": "particle size", "target_name": "aqua regia", "weight": 1.0, "year": 2020}, {"source": "39", "target": "55", "source_name": "particle size", "target_name": "ionic liquid", "weight": 1.0, "year": 2020}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2020}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 2.0, "year": 2020}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2020}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2020}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2020}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2020}, {"source": "43", "target": "51", "source_name": "transition metal", "target_name": "functional groups", "weight": 1.0, "year": 2020}, {"source": "43", "target": "53", "source_name": "transition metal", "target_name": "boronic acids", "weight": 1.0, "year": 2020}, {"source": "43", "target": "55", "source_name": "transition metal", "target_name": "ionic liquid", "weight": 1.0, "year": 2020}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2020}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2020}, {"source": "45", "target": "57", "source_name": "catalytic cycle", "target_name": "molecular oxygen", "weight": 1.0, "year": 2020}, {"source": "46", "target": "51", "source_name": "nobel prize", "target_name": "functional groups", "weight": 1.0, "year": 2020}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 5.0, "year": 2020}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2020}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 2.0, "year": 2020}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 2.0, "year": 2020}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2020}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2020}, {"source": "51", "target": "52", "source_name": "functional groups", "target_name": "reducing agent", "weight": 1.0, "year": 2020}, {"source": "51", "target": "54", "source_name": "functional groups", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2020}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2020}]}, {"2021": [{"source": "2", "target": "6", "source_name": "reductive elimination", "target_name": "natural products", "weight": 2.0, "year": 2021}, {"source": "2", "target": "9", "source_name": "reductive elimination", "target_name": "carbon monoxide", "weight": 1.0, "year": 2021}, {"source": "2", "target": "11", "source_name": "reductive elimination", "target_name": "organic synthesis", "weight": 1.0, "year": 2021}, {"source": "2", "target": "23", "source_name": "reductive elimination", "target_name": "density functional theory", "weight": 2.0, "year": 2021}, {"source": "2", "target": "31", "source_name": "reductive elimination", "target_name": "oxidative addition", "weight": 6.0, "year": 2021}, {"source": "2", "target": "43", "source_name": "reductive elimination", "target_name": "transition metal", "weight": 1.0, "year": 2021}, {"source": "2", "target": "45", "source_name": "reductive elimination", "target_name": "catalytic cycle", "weight": 2.0, "year": 2021}, {"source": "2", "target": "53", "source_name": "reductive elimination", "target_name": "boronic acids", "weight": 1.0, "year": 2021}, {"source": "2", "target": "56", "source_name": "reductive elimination", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2021}, {"source": "3", "target": "9", "source_name": "transmission electron microscopy", "target_name": "carbon monoxide", "weight": 2.0, "year": 2021}, {"source": "3", "target": "10", "source_name": "transmission electron microscopy", "target_name": "heck reaction", "weight": 3.0, "year": 2021}, {"source": "3", "target": "13", "source_name": "transmission electron microscopy", "target_name": "single crystal", "weight": 1.0, "year": 2021}, {"source": "3", "target": "19", "source_name": "transmission electron microscopy", "target_name": "room temperature", "weight": 3.0, "year": 2021}, {"source": "3", "target": "23", "source_name": "transmission electron microscopy", "target_name": "density functional theory", "weight": 1.0, "year": 2021}, {"source": "3", "target": "36", "source_name": "transmission electron microscopy", "target_name": "oxidation state", "weight": 2.0, "year": 2021}, {"source": "3", "target": "37", "source_name": "transmission electron microscopy", "target_name": "scanning electron microscopy", "weight": 3.0, "year": 2021}, {"source": "3", "target": "38", "source_name": "transmission electron microscopy", "target_name": "electron microscopy", "weight": 17.0, "year": 2021}, {"source": "3", "target": "39", "source_name": "transmission electron microscopy", "target_name": "particle size", "weight": 1.0, "year": 2021}, {"source": "3", "target": "42", "source_name": "transmission electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2021}, {"source": "3", "target": "52", "source_name": "transmission electron microscopy", "target_name": "reducing agent", "weight": 3.0, "year": 2021}, {"source": "3", "target": "55", "source_name": "transmission electron microscopy", "target_name": "ionic liquid", "weight": 1.0, "year": 2021}, {"source": "3", "target": "57", "source_name": "transmission electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2021}, {"source": "5", "target": "13", "source_name": "crystal structure", "target_name": "single crystal", "weight": 1.0, "year": 2021}, {"source": "5", "target": "14", "source_name": "crystal structure", "target_name": "carboxylic acid", "weight": 1.0, "year": 2021}, {"source": "5", "target": "19", "source_name": "crystal structure", "target_name": "room temperature", "weight": 2.0, "year": 2021}, {"source": "5", "target": "34", "source_name": "crystal structure", "target_name": "aqueous solution", "weight": 1.0, "year": 2021}, {"source": "6", "target": "10", "source_name": "natural products", "target_name": "heck reaction", "weight": 1.0, "year": 2021}, {"source": "6", "target": "11", "source_name": "natural products", "target_name": "organic synthesis", "weight": 2.0, "year": 2021}, {"source": "6", "target": "15", "source_name": "natural products", "target_name": "drug discovery", "weight": 2.0, "year": 2021}, {"source": "6", "target": "20", "source_name": "natural products", "target_name": "organic chemistry", "weight": 2.0, "year": 2021}, {"source": "6", "target": "23", "source_name": "natural products", "target_name": "density functional theory", "weight": 1.0, "year": 2021}, {"source": "6", "target": "27", "source_name": "natural products", "target_name": "biologically active", "weight": 4.0, "year": 2021}, {"source": "6", "target": "31", "source_name": "natural products", "target_name": "oxidative addition", "weight": 1.0, "year": 2021}, {"source": "6", "target": "36", "source_name": "natural products", "target_name": "oxidation state", "weight": 1.0, "year": 2021}, {"source": "6", "target": "43", "source_name": "natural products", "target_name": "transition metal", "weight": 3.0, "year": 2021}, {"source": "6", "target": "45", "source_name": "natural products", "target_name": "catalytic cycle", "weight": 1.0, "year": 2021}, {"source": "6", "target": "51", "source_name": "natural products", "target_name": "functional groups", "weight": 2.0, "year": 2021}, {"source": "6", "target": "54", "source_name": "natural products", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2021}, {"source": "6", "target": "56", "source_name": "natural products", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2021}, {"source": "9", "target": "11", "source_name": "carbon monoxide", "target_name": "organic synthesis", "weight": 1.0, "year": 2021}, {"source": "9", "target": "15", "source_name": "carbon monoxide", "target_name": "drug discovery", "weight": 1.0, "year": 2021}, {"source": "9", "target": "19", "source_name": "carbon monoxide", "target_name": "room temperature", "weight": 2.0, "year": 2021}, {"source": "9", "target": "20", "source_name": "carbon monoxide", "target_name": "organic chemistry", "weight": 2.0, "year": 2021}, {"source": "9", "target": "38", "source_name": "carbon monoxide", "target_name": "electron microscopy", "weight": 2.0, "year": 2021}, {"source": "9", "target": "39", "source_name": "carbon monoxide", "target_name": "particle size", "weight": 2.0, "year": 2021}, {"source": "9", "target": "51", "source_name": "carbon monoxide", "target_name": "functional groups", "weight": 1.0, "year": 2021}, {"source": "10", "target": "11", "source_name": "heck reaction", "target_name": "organic synthesis", "weight": 2.0, "year": 2021}, {"source": "10", "target": "20", "source_name": "heck reaction", "target_name": "organic chemistry", "weight": 1.0, "year": 2021}, {"source": "10", "target": "23", "source_name": "heck reaction", "target_name": "density functional theory", "weight": 1.0, "year": 2021}, {"source": "10", "target": "28", "source_name": "heck reaction", "target_name": "american chemical society", "weight": 1.0, "year": 2021}, {"source": "10", "target": "35", "source_name": "heck reaction", "target_name": "acrylic acid", "weight": 1.0, "year": 2021}, {"source": "10", "target": "36", "source_name": "heck reaction", "target_name": "oxidation state", "weight": 1.0, "year": 2021}, {"source": "10", "target": "37", "source_name": "heck reaction", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2021}, {"source": "10", "target": "38", "source_name": "heck reaction", "target_name": "electron microscopy", "weight": 2.0, "year": 2021}, {"source": "10", "target": "42", "source_name": "heck reaction", "target_name": "acetic acid", "weight": 2.0, "year": 2021}, {"source": "10", "target": "46", "source_name": "heck reaction", "target_name": "nobel prize", "weight": 2.0, "year": 2021}, {"source": "10", "target": "54", "source_name": "heck reaction", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2021}, {"source": "11", "target": "14", "source_name": "organic synthesis", "target_name": "carboxylic acid", "weight": 2.0, "year": 2021}, {"source": "11", "target": "15", "source_name": "organic synthesis", "target_name": "drug discovery", "weight": 1.0, "year": 2021}, {"source": "11", "target": "20", "source_name": "organic synthesis", "target_name": "organic chemistry", "weight": 6.0, "year": 2021}, {"source": "11", "target": "23", "source_name": "organic synthesis", "target_name": "density functional theory", "weight": 1.0, "year": 2021}, {"source": "11", "target": "27", "source_name": "organic synthesis", "target_name": "biologically active", "weight": 3.0, "year": 2021}, {"source": "11", "target": "31", "source_name": "organic synthesis", "target_name": "oxidative addition", "weight": 1.0, "year": 2021}, {"source": "11", "target": "33", "source_name": "organic synthesis", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2021}, {"source": "11", "target": "43", "source_name": "organic synthesis", "target_name": "transition metal", "weight": 3.0, "year": 2021}, {"source": "11", "target": "46", "source_name": "organic synthesis", "target_name": "nobel prize", "weight": 2.0, "year": 2021}, {"source": "11", "target": "51", "source_name": "organic synthesis", "target_name": "functional groups", "weight": 1.0, "year": 2021}, {"source": "11", "target": "53", "source_name": "organic synthesis", "target_name": "boronic acids", "weight": 2.0, "year": 2021}, {"source": "11", "target": "54", "source_name": "organic synthesis", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2021}, {"source": "11", "target": "56", "source_name": "organic synthesis", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2021}, {"source": "12", "target": "16", "source_name": "quit attempts", "target_name": "mental health", "weight": 1.0, "year": 2021}, {"source": "12", "target": "25", "source_name": "quit attempts", "target_name": "united states", "weight": 1.0, "year": 2021}, {"source": "12", "target": "59", "source_name": "quit attempts", "target_name": "african american", "weight": 1.0, "year": 2021}, {"source": "13", "target": "19", "source_name": "single crystal", "target_name": "room temperature", "weight": 1.0, "year": 2021}, {"source": "13", "target": "36", "source_name": "single crystal", "target_name": "oxidation state", "weight": 1.0, "year": 2021}, {"source": "13", "target": "37", "source_name": "single crystal", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2021}, {"source": "13", "target": "38", "source_name": "single crystal", "target_name": "electron microscopy", "weight": 1.0, "year": 2021}, {"source": "14", "target": "18", "source_name": "carboxylic acid", "target_name": "carbon dioxide", "weight": 1.0, "year": 2021}, {"source": "14", "target": "20", "source_name": "carboxylic acid", "target_name": "organic chemistry", "weight": 1.0, "year": 2021}, {"source": "14", "target": "22", "source_name": "carboxylic acid", "target_name": "aryl chlorides", "weight": 2.0, "year": 2021}, {"source": "14", "target": "24", "source_name": "carboxylic acid", "target_name": "hydrochloric acid", "weight": 1.0, "year": 2021}, {"source": "14", "target": "26", "source_name": "carboxylic acid", "target_name": "complexing agent", "weight": 2.0, "year": 2021}, {"source": "14", "target": "32", "source_name": "carboxylic acid", "target_name": "detection limit", "weight": 1.0, "year": 2021}, {"source": "14", "target": "34", "source_name": "carboxylic acid", "target_name": "aqueous solution", "weight": 1.0, "year": 2021}, {"source": "14", "target": "45", "source_name": "carboxylic acid", "target_name": "catalytic cycle", "weight": 1.0, "year": 2021}, {"source": "14", "target": "51", "source_name": "carboxylic acid", "target_name": "functional groups", "weight": 1.0, "year": 2021}, {"source": "14", "target": "52", "source_name": "carboxylic acid", "target_name": "reducing agent", "weight": 1.0, "year": 2021}, {"source": "14", "target": "56", "source_name": "carboxylic acid", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2021}, {"source": "14", "target": "57", "source_name": "carboxylic acid", "target_name": "molecular oxygen", "weight": 4.0, "year": 2021}, {"source": "15", "target": "20", "source_name": "drug discovery", "target_name": "organic chemistry", "weight": 2.0, "year": 2021}, {"source": "15", "target": "27", "source_name": "drug discovery", "target_name": "biologically active", "weight": 1.0, "year": 2021}, {"source": "15", "target": "33", "source_name": "drug discovery", "target_name": "medicinal chemistry", "weight": 3.0, "year": 2021}, {"source": "15", "target": "51", "source_name": "drug discovery", "target_name": "functional groups", "weight": 3.0, "year": 2021}, {"source": "17", "target": "19", "source_name": "fuel cell", "target_name": "room temperature", "weight": 1.0, "year": 2021}, {"source": "17", "target": "23", "source_name": "fuel cell", "target_name": "density functional theory", "weight": 1.0, "year": 2021}, {"source": "17", "target": "47", "source_name": "fuel cell", "target_name": "formic acid", "weight": 3.0, "year": 2021}, {"source": "18", "target": "20", "source_name": "carbon dioxide", "target_name": "organic chemistry", "weight": 1.0, "year": 2021}, {"source": "18", "target": "22", "source_name": "carbon dioxide", "target_name": "aryl chlorides", "weight": 1.0, "year": 2021}, {"source": "18", "target": "34", "source_name": "carbon dioxide", "target_name": "aqueous solution", "weight": 1.0, "year": 2021}, {"source": "18", "target": "43", "source_name": "carbon dioxide", "target_name": "transition metal", "weight": 1.0, "year": 2021}, {"source": "18", "target": "47", "source_name": "carbon dioxide", "target_name": "formic acid", "weight": 1.0, "year": 2021}, {"source": "18", "target": "55", "source_name": "carbon dioxide", "target_name": "ionic liquid", "weight": 1.0, "year": 2021}, {"source": "18", "target": "57", "source_name": "carbon dioxide", "target_name": "molecular oxygen", "weight": 1.0, "year": 2021}, {"source": "19", "target": "21", "source_name": "room temperature", "target_name": "green chemistry", "weight": 1.0, "year": 2021}, {"source": "19", "target": "22", "source_name": "room temperature", "target_name": "aryl chlorides", "weight": 1.0, "year": 2021}, {"source": "19", "target": "24", "source_name": "room temperature", "target_name": "hydrochloric acid", "weight": 2.0, "year": 2021}, {"source": "19", "target": "31", "source_name": "room temperature", "target_name": "oxidative addition", "weight": 1.0, "year": 2021}, {"source": "19", "target": "32", "source_name": "room temperature", "target_name": "detection limit", "weight": 1.0, "year": 2021}, {"source": "19", "target": "37", "source_name": "room temperature", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2021}, {"source": "19", "target": "38", "source_name": "room temperature", "target_name": "electron microscopy", "weight": 3.0, "year": 2021}, {"source": "19", "target": "39", "source_name": "room temperature", "target_name": "particle size", "weight": 2.0, "year": 2021}, {"source": "19", "target": "43", "source_name": "room temperature", "target_name": "transition metal", "weight": 1.0, "year": 2021}, {"source": "19", "target": "44", "source_name": "room temperature", "target_name": "royal society", "weight": 1.0, "year": 2021}, {"source": "19", "target": "47", "source_name": "room temperature", "target_name": "formic acid", "weight": 1.0, "year": 2021}, {"source": "19", "target": "48", "source_name": "room temperature", "target_name": "nitric acid", "weight": 2.0, "year": 2021}, {"source": "19", "target": "52", "source_name": "room temperature", "target_name": "reducing agent", "weight": 1.0, "year": 2021}, {"source": "19", "target": "55", "source_name": "room temperature", "target_name": "ionic liquid", "weight": 3.0, "year": 2021}, {"source": "20", "target": "22", "source_name": "organic chemistry", "target_name": "aryl chlorides", "weight": 1.0, "year": 2021}, {"source": "20", "target": "28", "source_name": "organic chemistry", "target_name": "american chemical society", "weight": 1.0, "year": 2021}, {"source": "20", "target": "33", "source_name": "organic chemistry", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2021}, {"source": "20", "target": "38", "source_name": "organic chemistry", "target_name": "electron microscopy", "weight": 1.0, "year": 2021}, {"source": "20", "target": "43", "source_name": "organic chemistry", "target_name": "transition metal", "weight": 4.0, "year": 2021}, {"source": "20", "target": "45", "source_name": "organic chemistry", "target_name": "catalytic cycle", "weight": 1.0, "year": 2021}, {"source": "20", "target": "46", "source_name": "organic chemistry", "target_name": "nobel prize", "weight": 1.0, "year": 2021}, {"source": "20", "target": "53", "source_name": "organic chemistry", "target_name": "boronic acids", "weight": 1.0, "year": 2021}, {"source": "20", "target": "57", "source_name": "organic chemistry", "target_name": "molecular oxygen", "weight": 2.0, "year": 2021}, {"source": "21", "target": "43", "source_name": "green chemistry", "target_name": "transition metal", "weight": 1.0, "year": 2021}, {"source": "21", "target": "51", "source_name": "green chemistry", "target_name": "functional groups", "weight": 1.0, "year": 2021}, {"source": "21", "target": "52", "source_name": "green chemistry", "target_name": "reducing agent", "weight": 1.0, "year": 2021}, {"source": "21", "target": "55", "source_name": "green chemistry", "target_name": "ionic liquid", "weight": 2.0, "year": 2021}, {"source": "22", "target": "36", "source_name": "aryl chlorides", "target_name": "oxidation state", "weight": 1.0, "year": 2021}, {"source": "22", "target": "39", "source_name": "aryl chlorides", "target_name": "particle size", "weight": 1.0, "year": 2021}, {"source": "22", "target": "51", "source_name": "aryl chlorides", "target_name": "functional groups", "weight": 2.0, "year": 2021}, {"source": "22", "target": "57", "source_name": "aryl chlorides", "target_name": "molecular oxygen", "weight": 1.0, "year": 2021}, {"source": "23", "target": "31", "source_name": "density functional theory", "target_name": "oxidative addition", "weight": 1.0, "year": 2021}, {"source": "23", "target": "36", "source_name": "density functional theory", "target_name": "oxidation state", "weight": 1.0, "year": 2021}, {"source": "23", "target": "38", "source_name": "density functional theory", "target_name": "electron microscopy", "weight": 1.0, "year": 2021}, {"source": "23", "target": "43", "source_name": "density functional theory", "target_name": "transition metal", "weight": 2.0, "year": 2021}, {"source": "23", "target": "45", "source_name": "density functional theory", "target_name": "catalytic cycle", "weight": 2.0, "year": 2021}, {"source": "23", "target": "47", "source_name": "density functional theory", "target_name": "formic acid", "weight": 1.0, "year": 2021}, {"source": "23", "target": "56", "source_name": "density functional theory", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2021}, {"source": "24", "target": "35", "source_name": "hydrochloric acid", "target_name": "acrylic acid", "weight": 1.0, "year": 2021}, {"source": "24", "target": "40", "source_name": "hydrochloric acid", "target_name": "precious metals", "weight": 3.0, "year": 2021}, {"source": "24", "target": "47", "source_name": "hydrochloric acid", "target_name": "formic acid", "weight": 1.0, "year": 2021}, {"source": "24", "target": "48", "source_name": "hydrochloric acid", "target_name": "nitric acid", "weight": 4.0, "year": 2021}, {"source": "24", "target": "49", "source_name": "hydrochloric acid", "target_name": "aqua regia", "weight": 1.0, "year": 2021}, {"source": "24", "target": "52", "source_name": "hydrochloric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2021}, {"source": "25", "target": "44", "source_name": "united states", "target_name": "royal society", "weight": 1.0, "year": 2021}, {"source": "25", "target": "58", "source_name": "united states", "target_name": "higher education", "weight": 1.0, "year": 2021}, {"source": "26", "target": "34", "source_name": "complexing agent", "target_name": "aqueous solution", "weight": 1.0, "year": 2021}, {"source": "26", "target": "35", "source_name": "complexing agent", "target_name": "acrylic acid", "weight": 2.0, "year": 2021}, {"source": "26", "target": "42", "source_name": "complexing agent", "target_name": "acetic acid", "weight": 1.0, "year": 2021}, {"source": "26", "target": "47", "source_name": "complexing agent", "target_name": "formic acid", "weight": 1.0, "year": 2021}, {"source": "26", "target": "51", "source_name": "complexing agent", "target_name": "functional groups", "weight": 1.0, "year": 2021}, {"source": "26", "target": "52", "source_name": "complexing agent", "target_name": "reducing agent", "weight": 4.0, "year": 2021}, {"source": "27", "target": "43", "source_name": "biologically active", "target_name": "transition metal", "weight": 2.0, "year": 2021}, {"source": "27", "target": "46", "source_name": "biologically active", "target_name": "nobel prize", "weight": 2.0, "year": 2021}, {"source": "27", "target": "51", "source_name": "biologically active", "target_name": "functional groups", "weight": 1.0, "year": 2021}, {"source": "27", "target": "54", "source_name": "biologically active", "target_name": "nobel prize in chemistry", "weight": 2.0, "year": 2021}, {"source": "28", "target": "46", "source_name": "american chemical society", "target_name": "nobel prize", "weight": 1.0, "year": 2021}, {"source": "28", "target": "48", "source_name": "american chemical society", "target_name": "nitric acid", "weight": 1.0, "year": 2021}, {"source": "31", "target": "33", "source_name": "oxidative addition", "target_name": "medicinal chemistry", "weight": 1.0, "year": 2021}, {"source": "31", "target": "43", "source_name": "oxidative addition", "target_name": "transition metal", "weight": 2.0, "year": 2021}, {"source": "31", "target": "45", "source_name": "oxidative addition", "target_name": "catalytic cycle", "weight": 2.0, "year": 2021}, {"source": "31", "target": "51", "source_name": "oxidative addition", "target_name": "functional groups", "weight": 1.0, "year": 2021}, {"source": "31", "target": "53", "source_name": "oxidative addition", "target_name": "boronic acids", "weight": 1.0, "year": 2021}, {"source": "31", "target": "56", "source_name": "oxidative addition", "target_name": "nucleophilic attack", "weight": 3.0, "year": 2021}, {"source": "32", "target": "34", "source_name": "detection limit", "target_name": "aqueous solution", "weight": 1.0, "year": 2021}, {"source": "32", "target": "43", "source_name": "detection limit", "target_name": "transition metal", "weight": 1.0, "year": 2021}, {"source": "33", "target": "56", "source_name": "medicinal chemistry", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2021}, {"source": "34", "target": "37", "source_name": "aqueous solution", "target_name": "scanning electron microscopy", "weight": 1.0, "year": 2021}, {"source": "34", "target": "38", "source_name": "aqueous solution", "target_name": "electron microscopy", "weight": 1.0, "year": 2021}, {"source": "34", "target": "47", "source_name": "aqueous solution", "target_name": "formic acid", "weight": 1.0, "year": 2021}, {"source": "34", "target": "48", "source_name": "aqueous solution", "target_name": "nitric acid", "weight": 3.0, "year": 2021}, {"source": "34", "target": "52", "source_name": "aqueous solution", "target_name": "reducing agent", "weight": 3.0, "year": 2021}, {"source": "35", "target": "57", "source_name": "acrylic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2021}, {"source": "36", "target": "38", "source_name": "oxidation state", "target_name": "electron microscopy", "weight": 2.0, "year": 2021}, {"source": "36", "target": "39", "source_name": "oxidation state", "target_name": "particle size", "weight": 1.0, "year": 2021}, {"source": "36", "target": "43", "source_name": "oxidation state", "target_name": "transition metal", "weight": 2.0, "year": 2021}, {"source": "36", "target": "45", "source_name": "oxidation state", "target_name": "catalytic cycle", "weight": 2.0, "year": 2021}, {"source": "36", "target": "49", "source_name": "oxidation state", "target_name": "aqua regia", "weight": 1.0, "year": 2021}, {"source": "36", "target": "56", "source_name": "oxidation state", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2021}, {"source": "36", "target": "57", "source_name": "oxidation state", "target_name": "molecular oxygen", "weight": 2.0, "year": 2021}, {"source": "37", "target": "38", "source_name": "scanning electron microscopy", "target_name": "electron microscopy", "weight": 11.0, "year": 2021}, {"source": "37", "target": "53", "source_name": "scanning electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2021}, {"source": "38", "target": "39", "source_name": "electron microscopy", "target_name": "particle size", "weight": 1.0, "year": 2021}, {"source": "38", "target": "42", "source_name": "electron microscopy", "target_name": "acetic acid", "weight": 1.0, "year": 2021}, {"source": "38", "target": "52", "source_name": "electron microscopy", "target_name": "reducing agent", "weight": 4.0, "year": 2021}, {"source": "38", "target": "53", "source_name": "electron microscopy", "target_name": "boronic acids", "weight": 1.0, "year": 2021}, {"source": "38", "target": "55", "source_name": "electron microscopy", "target_name": "ionic liquid", "weight": 2.0, "year": 2021}, {"source": "38", "target": "57", "source_name": "electron microscopy", "target_name": "molecular oxygen", "weight": 1.0, "year": 2021}, {"source": "39", "target": "48", "source_name": "particle size", "target_name": "nitric acid", "weight": 1.0, "year": 2021}, {"source": "39", "target": "49", "source_name": "particle size", "target_name": "aqua regia", "weight": 1.0, "year": 2021}, {"source": "39", "target": "55", "source_name": "particle size", "target_name": "ionic liquid", "weight": 1.0, "year": 2021}, {"source": "40", "target": "43", "source_name": "precious metals", "target_name": "transition metal", "weight": 1.0, "year": 2021}, {"source": "40", "target": "47", "source_name": "precious metals", "target_name": "formic acid", "weight": 2.0, "year": 2021}, {"source": "42", "target": "47", "source_name": "acetic acid", "target_name": "formic acid", "weight": 1.0, "year": 2021}, {"source": "42", "target": "48", "source_name": "acetic acid", "target_name": "nitric acid", "weight": 2.0, "year": 2021}, {"source": "42", "target": "49", "source_name": "acetic acid", "target_name": "aqua regia", "weight": 1.0, "year": 2021}, {"source": "42", "target": "57", "source_name": "acetic acid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2021}, {"source": "43", "target": "51", "source_name": "transition metal", "target_name": "functional groups", "weight": 1.0, "year": 2021}, {"source": "43", "target": "53", "source_name": "transition metal", "target_name": "boronic acids", "weight": 1.0, "year": 2021}, {"source": "43", "target": "55", "source_name": "transition metal", "target_name": "ionic liquid", "weight": 1.0, "year": 2021}, {"source": "43", "target": "56", "source_name": "transition metal", "target_name": "nucleophilic attack", "weight": 2.0, "year": 2021}, {"source": "45", "target": "56", "source_name": "catalytic cycle", "target_name": "nucleophilic attack", "weight": 1.0, "year": 2021}, {"source": "45", "target": "57", "source_name": "catalytic cycle", "target_name": "molecular oxygen", "weight": 1.0, "year": 2021}, {"source": "46", "target": "51", "source_name": "nobel prize", "target_name": "functional groups", "weight": 1.0, "year": 2021}, {"source": "46", "target": "54", "source_name": "nobel prize", "target_name": "nobel prize in chemistry", "weight": 5.0, "year": 2021}, {"source": "47", "target": "48", "source_name": "formic acid", "target_name": "nitric acid", "weight": 1.0, "year": 2021}, {"source": "47", "target": "52", "source_name": "formic acid", "target_name": "reducing agent", "weight": 2.0, "year": 2021}, {"source": "48", "target": "49", "source_name": "nitric acid", "target_name": "aqua regia", "weight": 3.0, "year": 2021}, {"source": "48", "target": "52", "source_name": "nitric acid", "target_name": "reducing agent", "weight": 1.0, "year": 2021}, {"source": "48", "target": "55", "source_name": "nitric acid", "target_name": "ionic liquid", "weight": 1.0, "year": 2021}, {"source": "51", "target": "52", "source_name": "functional groups", "target_name": "reducing agent", "weight": 1.0, "year": 2021}, {"source": "51", "target": "54", "source_name": "functional groups", "target_name": "nobel prize in chemistry", "weight": 1.0, "year": 2021}, {"source": "55", "target": "57", "source_name": "ionic liquid", "target_name": "molecular oxygen", "weight": 1.0, "year": 2021}]}]}