Substituent Effect on Redox Behavior of N,C,S-Pincer IronCarbonyl Complexes Bearing a Quinolyl Group

摘要

Development of carbon monoxide-releasing molecules has emerged as an importantresearch area since carbon monoxide (CO) was recognized as a signaling molecule inbiological pathways.Previously we reported that near-infrared light-triggered release ofCO is achievable by using N,C,S-pincer iron(III) carbonyl complexes with two axialphosphorus ligands.The wavelength dependence of the photoinduced dissociation of COwas related to the π-acceptor ability of the phosphorus ligands.To control the photoinducedCO-release properties,we developed N,C,S-tridentate ligands derived fromquinolyl-substituted benzothiophenes as well as monocyclic thiophenes.In this study,amethoxy group was introduced to the original precursor 8-(benzo[b]thiophen-2-yl)quinoline(QBT) at the 3-position,which is adjacent to the central C donor atom in the N,C,S-pincercomplexes.