Reduction of Cobalt and Iron Corroles and Catalyzed Reduction of CO2

• DOI: 10.1021/jp013668o
• Publication Date: 2002-07-26T06:11:09Z
• Authors: Jan Grodkowski; Pedatsur Neta; Etsuko Fujita; Atif Mahammed; Liliya Simkhovich; Zeev Gross
• Keywords: Corrole

The role of cobalt and iron corroles in catalytic CO2 reduction has been studied. Chemical, electrochemical, photochemical reductions the stable metal Ph3PCoIII(tpfc) (tpfc = 5,10,15-tris(pentafluorophenyl)corrole), ClFeIV(tpfc), ClFeIV(tdcc) (tdcc 5,10,15-tris(2,6-dichlorophenyl)corrole) have carried out acetonitrile solutions. Stepwise to [MII(tpfc)]- [MI(tpfc)]2- states was observed all cases. Gradual with sodium amalgam permitted recording optical absorption spectra various oxidation showed that MI state reacts CO2. Cyclic voltammetry Ar-saturated solutions determination following half-wave potentials: for Ph3PCoIII(tpfc), 1.11 V, 0.72 −0.42 V (Epc), −1.44 −2.3 (Epc); 0.44 −1.01 −1.60 −2.2 ClFeIV(tdcc), 0.24 −1.18 −1.78 vs SCE a scan rate 0.1 s-1. CO2-saturated indicated CoI FeI complexes react reduced Fe(tdcc) complex is most efficient electrocatalyst reduction, showing largest currents among these corroles. Photochemical containing p-terphenyl (TP) as sensitizer triethylamine (TEA) reductant led production CO H2. These experiments also show more effective than other catalyst. present finding can contrast case respective porphyrins phthalocyanines, which do not until they are beyond state.