Formamidinate bridged dirhodium(II,II) complexes with chelating diimine ligands L, [Rh2(μ-DTolF)2(L)2]2+, were shown to electrocatalytically reduce CO2 in the presence of a proton source. The major products following bulk electrolysis were determined to be H2 as the major project and HCOOH as the less abundant product. Variations in the bridging ligands from formamidinate to acetamide and acetate result in changes in the relative ratios of products. Irradiation of a sensitizer such as [Ru(bpy)3]2+ (bpy = 2,2'-bipyridine) in the presence of dirhodium(II,II) catalysts and a sacrificial donor also results in CO2 reduction, showing that the CO2 reduction by these catalysts can be coupled to a light absorber.

New robust photo- and electrocatalysts for H2 evolution and CO2 reduction

255th National Meeting (2018)

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