Abstract

The formation of the cation radical of methyl viologen was established when an acetonitrile-water solution containing methyl viologen and triphenylamine was irradiated by near ultraviolet light. The reduction of methyl viologen has been studied kinetically, and the reduction rate was expressed as follows. ▪ On the addition of hydrogenase to the above photoirradiated system hydrogen evolution after water reduction was observed. The mechanisms of methyl viologen reduction and hydrogen evolution are discussed.

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