In the presented work the rhenium complex fac-(5,5'-bisphenylethynyl-2,2'-bipyridyl)Re(CO)3Cl was used as a novel catalyst for the electro- and photochemical reduction of CO2 to CO in homogeneous solution. The results were compared to (2,2'-bipyridyl)Re(CO)3Cl as a benchmark compound. Cyclovoltammetric studies as well as controlled potential electrolysis experiments were performed using a CO2-saturated solution in acetonitrile. (5,5'-bisphenylethynyl-2,2'-bipyridyl)Re(CO)3Cl showed a 6.5-fold increase in current density under CO2 at - 1750 mV versus normal hydrogen electrode (NHE) as compared to the operation without CO2. The CO2 reduction potential, determined by cyclic voltammetry occurs at ca. 300 mV more positive potential compared to the benchmark compound. Additionally the electrochemical data obtained indicate a three times higher rate constant of about 220 M-1 s-1 for our new catalyst. Quantitative analysis by gas chromatography (GC) and infrared spectroscopy showed a Faradaic efficiency of around 45% for the formation of CO.

Selective reduction of carbon dioxide to carbon monoxide with rhenium(I) complex (5,5'-bisphenylethynyl-2,2'-bipyridyl)Re(CO)<sub>3</sub>Cl

244th National Meeting (2012)

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Selective reduction of carbon dioxide to carbon monoxide with rhenium(I) complex (5,5'-bisphenylethynyl-2,2'-bipyridyl)Re(CO)3Cl

Selective reduction of carbon dioxide to carbon monoxide with rhenium(I) complex (5,5'-bisphenylethynyl-2,2'-bipyridyl)Re(CO)₃Cl