Unexpected effect of catalyst concentration on photochemical CO₂ reduction by trans(Cl)-Ru(bpy)(CO)₂Cl₂: new mechanistic insight into the CO/HCOO^- selectivity.

ABSTRACT: Photochemical CO₂ reduction catalysed by trans(Cl)-Ru(bpy)(CO)₂Cl₂ (bpy = 2,2'-bipyridine) efficiently produces carbon monoxide (CO) and formate (HCOO^-) in N,N-dimethylacetamide (DMA)/water containing [Ru(bpy)₃]²⁺ as a photosensitizer and 1-benzyl-1,4-dihydronicotinamide (BNAH) as an electron donor. We have unexpectedly found catalyst concentration dependence of the product ratio (CO/HCOO^-) in the photochemical CO₂ reduction: the ratio of CO/HCOO^- decreases with increasing catalyst concentration. The result has led us to propose a new mechanism in which HCOO^- is selectively produced by the formation of a Ru(i)-Ru(i) dimer as the catalyst intermediate. This reac

SUBMITTER: Kuramochi Y 

PROVIDER: S-EPMC5490049 | biostudies-literature | 2015 May

REPOSITORIES: biostudies-literature