Irradiation with visible light of a mixture of an alkene in degassed aqueous acetonitrile containing tetraphenylporphyrinantimony(v) as a sensitizer, methylviologen as an electron acceptor, and hydroxide ion, induced epoxidation of the alkene accompanied by hydrogen evolution, with water acting as the electron donor.Recent extensive studies on various photoredox systems have led to the finding of systems which evolve hydrogen efficiently upon visible light irradiation.2.3 Most of these systems involve sacrificial electron donors such as amines, a sensitizer such as a metal complex, and an electron acceptor such as methylviologen which can be coupled with hydrogen evolution catalysed by a noble metal such as colloidal platinum. Here we explore electron donors from the viewpoint of solar energy storage.
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