Abstract
AbstractAs described in Chaps. 2 and 3, a new class of multinuclear complexes, which have two photosensitizer units and a catalyst unit, was successfully synthesized by establishing the suitable reaction conditions for the Mizoroki–Heck reaction. However, the multinuclear complexes were linked through unsaturated vinylene linkers; therefore, they did not show high photocatalytic ability due to the lowered reducing power caused by the large π-conjugation. This chapter will report a photochemical hydrogenation method for converting the unsaturated linkers in the bridging ligands to their corresponding saturated carbon chains. The vinylene and ethynylene linkers in the bridging ligands of photofunctional multinuclear complexes synthesized by various coupling reactions were successfully converted to their corresponding saturated carbon chains under visible light irradiation in a MeCN−pyridine–CF3COOH (3:1:0.1 v/v/v) mixed solution containing the starting metal complexes and a sacrificial electron donor in high yields. The new Ru(II)2-Re(I) and Os(II)-Re(I)-Ru(II) trinuclear complexes, which showed high photocatalytic abilities for CO2 reduction, were synthesized for the first time by combining the hydrogenation and the Mizoroki–Heck reactions.KeywordsPhotochemical hydrogenationHetero-trinuclear complexPhotocatalytic CO2 reductionElectrochemical hydrogenation
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