[M(dpphen)(CO)3X] (dpphen= 4,7-Diphenyl-1,10-phenanthroline, M=Mn & X=Br (1  ), and M=Re & X=Cl(2  )) were synthesized and their catalytic activities for CO2 reduction to CO were studied by using electrochemical methods. Complex 1  is the first known organomanganese catalyst to catalyze the CO2 reduction significantly (ic/ip = 12.2 at the potential of -2.5 V vs. Fc+/0) without the help of any external proton source. Factors other than the electrocatalyst reduction potentials such as steric effects and degree of conjugation are responsible for the catalytic activities. The manganese analogue (1  ) displays larger catalytic currents than that of rhenium (2  ) which indicates the possibility of using earth abundant manganese as a substitute for expensive rhenium metal in making CO2 reduction electrocatalysts.

Electrocatalytic reduction of CO<sub>2</sub> to CO by [M(dpphen)(CO)<sub>3</sub>X](M=Re & Mn): Catalysis without an external proton source

248th National Meeting (2014)

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Electrocatalytic reduction of CO2 to CO by [M(dpphen)(CO)3X](M=Re & Mn): Catalysis without an external proton source

Electrocatalytic reduction of CO₂ to CO by [M(dpphen)(CO)₃X](M=Re & Mn): Catalysis without an external proton source