Electrocatalytic carbon dioxide reduction by using cationic pentamethylcyclopentadienyl-iridium complexes with unsymmetrically substituted bipyridine ligands.
作者： Fanni D. Sypaseuth , Corinna Matlachowski , Manuela Weber , Matthias Schwalbe , C. Christoph Tzschucke
关键词: Chemistry 、 Acetonitrile 、 Cyclic voltammetry 、 Medicinal chemistry 、 Redox 、 Catalysis 、 Electrochemical reduction of carbon dioxide 、 Carbon monoxide 、 Bipyridine 、 Inorganic chemistry 、 Iridium
摘要: Eight [Ir(bpy)Cp*Cl]+-type complexes (bpy= bipyridine, Cp*=1,2,3,4,5-pentamethylcyclopentadienyl) containing differently substituted bipyridine ligands were synthesized and characterized. Cyclic voltammetry (CV) of the in Ar-saturated acetonitrile solutions showed that redox behavior could be fine tuned by electronic properties ligands. Further CV CO2-saturated MeCN/H2O (9:1, v/v) catalytic currents for CO2 reduction. In controlled potential electrolysis experiments (MeCN/MeOH (1:1, v/v), Eapp=−1.80 V vs Ag/AgCl), all moderate activity electrocatalytic reduction with good stability over at least 15 hours. This process was selective toward formic acid, only traces dihydrogen or carbon monoxide occasionally formaldehyde as byproducts. However, turnover frequencies current efficiencies quite low. No direct correlation between potentials their observed.
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