Abstract
In situ visible absorption spectra were measured under photoirradiated state of an aqueous solution involving Ru(bpy) 3 2+ and methylviologen (MV 2+). The short-lived viologen cation radical (MV +) was observed under photoirradiated conditions. In the system of ethylenediaminetetraacetic acid (EDTA)/Ru(bpy) 3 2+/Ni-phthalocyaninesulfonate (NiPcS), the reduced species of the NiPcS was not observed, but the coexistence of MV 2+ induced the reduction of NiPcS showing that successive electron transfers from the photoexcited Ru(bpy) 3 2+ to MV 2+, and then further from the MV + to NiPcS take place in the mixture. The photochemical evolution of H 2 was remarkably enhanced by the presence of the second electron acceptor (NiPcS) in the aqueous mixture of EDTA/Ru(bpy) 3 2+/MV 2+/Pt-black.
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