The mechanism of electron transfer reaction for xanthene dye-sensitized formation of methyl viologen radical.
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概要
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Sensitized reduction of methyl viologen, MV<SUP>2+</SUP>, occurs efficiently through electron transfer from triplet xanthene dyes to MV<SUP>2+</SUP> followed by electron transfer to the resulting semioxidized dyes from a reductant like triethanolamine. Unreactive ion pair complexes between these dyes and MV<SUP>2+</SUP> are formed (formation constant: 1.2×10<SUP>3</SUP> M<SUP>−1</SUP> for Eosine Y and MV<SUP>2+</SUP> in 50% aqueous ethanol solution). The quantum yield for the reduced methyl viologen radical depends on the concentrations of MV<SUP>2+</SUP> and the amine and on the ionic strength of solution. The efficiency of the electron transfer from triplet dyes to MV<SUP>2+</SUP> is increased by addition of alcohol, and solvent effects on the reaction mechanism are discussed.
- 公益社団法人 日本化学会の論文
著者
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Usui Yoshiharu
Department Of Achemistry Faculty Of Science Ibaraki University
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Sakuragi Hirochika
Department Of Chemistry University Of Tsukuba
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Misawa Hiroaki
Department Of Chemistry University Of Tsukuba
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Tokumaru Katsumi
Department of Chemistry Faculty of Science The University of Tokyo
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