Light-induced redox characteristics of (tetrakis(4-methylpyridyl)-porphyrinato)manganese(III).

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概要

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• [Tetrakis(4-methylpyridyl)porphyrinato]manganese(III) (Mn<SUP>III</SUP>(tmpp)) undergoes reversible one-electron transfer reactions in aqueous solutions. The half-wave potential of Mn<SUP>III/II</SUP>(tmpp) redox couple is −0.21V (<I>vs.</I> 3.33 M KCl, AgCl/Ag) between pH 4 and 12. On the other hand, the half-wave potential of Mn<SUP>IV/III</SUP>(tmpp) redox couple becomes less positive with increasing pH in alkaline solution. A small amount of methylviologen cation radical (MV<SUP>.<SUP>+</SUP></SUP>) is built up by irradiating with visible light an alkaline solution containing Mn<SUP>III</SUP>(tmpp), methylviologen (MV<SUP>2+</SUP>), and sacrificial electron donors. The formation of MV<SUP>.<SUP>+</SUP></SUP> is attributed to either the reduction of photoexcited Mn<SUP>III</SUP>(tmpp) (<SUP>*</SUP>Mn<SUP>III</SUP>(tmpp)) with an electron donor or the oxidation of <SUP>*</SUP>Mn<SUP>III</SUP>(tmpp) with MV<SUP>2+</SUP>.

• 公益社団法人 日本化学会の論文

著者

• KOMURA Teruhisa

  Faculty of Technology, Kanazawa University

• Imanaga Hiroto

  Faculty of Technology, Kanazawa University

• Takahashi Koushin

  Faculty of Technology, Kanazawa University

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