Studies of Ruthenium Complexes. VII. Photochemical Reactions of <I>cis</I>-Dihalogenotetraammineruthenium(III) Complexes in Aqueous Solutions
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概要
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Studies have been made of the photochemistry of <I>cis</I>-dihalogenotetraammineruthenium(III) in aqueous solutions. For the <I>cis</I>-dichlorocomplex, no photochemical reaction has been observed by the irradiation of the visible light region. For <I>cis</I>-dibromo- and <I>cis</I>-diiodo-complexes, a simple aquation of halide ligand seems to occur in a solution with a pH lower than 2.5. The typical values of the quantum yields for the <I>cis</I>-[RuX<SUB>2</SUB>(NH<SUB>3</SUB>)<SUB>4</SUB>] <SUP>+</SUP>+H<SUB>2</SUB>O\xrightarrow<I>h</I>ν <I>cis</I>-[RuX(OH<SUB>2</SUB>)(NH<SUB>3</SUB>)<SUB>4</SUB>]<SUP>2+</SUP>X<SUP>−</SUP> reaction were 0.27×10<SUP>−2</SUP> (382 nm light) and 0.82×10<SUP>−2</SUP>(408 nm light) for dibromo- and dichloro-complexes respectively. The quantum yield was dependent on the wavelength of light, but was independent of the concentrations of halide and hydrogen ions. The quantum yield seems to depend on the oxidizability of the ligand or on probability of the deactivation process in the primary excited state. In accounting for the low quantum yield, it seems most probable that the photoexcited complex species is converted to the ground state by non-radiative transitions.
- 公益社団法人 日本化学会の論文
著者
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Ohyoshi Akira
Department Of Applied Chemistry Faculty Of Engineering Kumamoto University
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Tsuji Kazuhiko
Department Of Materials Chemistry Ryukoku University
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Yoshikuni Kenichiro
Department of Industrial Chemistry, Faculty of Engineering, Kumamoto University
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Takebayashi Noriyuki
Department of Industrial Chemistry, Faculty of Engineering, Kumamoto University
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Hiroshima Yutaka
Department of Industrial Chemistry, Faculty of Engineering, Kumamoto University
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