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

• Usui Yoshiharu

  Department Of Achemistry Faculty Of Science Ibaraki University

• Sakuragi Hirochika

  Department Of Chemistry University Of Tsukuba

• Misawa Hiroaki

  Department Of Chemistry University Of Tsukuba

• Tokumaru Katsumi

  Department of Chemistry Faculty of Science The University of Tokyo

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