Electron-transfer reaction from sodium benzenethiolate to acceptors assisted by photo-excited tris(2,2'-bipyridine)ruthenium(II).
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概要
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The photo-excited tris(2,2′-bipyridine)ruthenium(II) (Ru(bpy)<SUB>3</SUB><SUP>2+*</SUP>) was effectively quenched by sodium benzenethiolate in acetonitrile (Stern-Volmer constant=4860 dm<SUP>3</SUP> mol<SUP>−1</SUP>). The flash photolysis of a solution containing Ru(bpy)<SUB>3</SUB><SUP>2+</SUP> and benzenethiolate (excitation wavelength (λ)>480 nm) produced transient species absorbing <I>ca.</I> 510 nm; this species was identified as Ru(bpy)<SUB>3</SUB><SUP>+</SUP> and decayed with first-order kinetics with <I>k</I>=3.0 s<SUP>−1</SUP>. This slow decay of Ru(bpy)<SUB>3</SUB><SUP>+</SUP> implies that the back-electron-transfer reaction was suppressed. The decay of Ru(bpy)<SUB>3</SUB><SUP>+</SUP> was accelerated by the addition of water, suggesting the possibility of the reaction between Ru(bpy)<SUB>3</SUB><SUP>+</SUP> and water, though no H<SUB>2</SUB> was detected. The steady irradiation of a solution containing Ru(bpy)<SUB>3</SUB><SUP>2+</SUP>, benzenethiolate, and an electron-acceptor produced the radical anion of the added acceptor, which was detected with ESR spectroscopy.
- 公益社団法人 日本化学会の論文
著者
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Matsuda Minoru
Chemical Research Institute of Non-aqueous Solutions, Tohoku University
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Miyashita Tokuji
Chemical Research Institute of Non-Aqueous Solutions, Tohoku University
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