Photoreduction of aminoanthraquinones by an electron transfer via the upper excited n.PI.* triplet state.

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概要

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• The photoreduction of 2-piperidinoanthraquinone (<B>1</B>) by an electron transfer from hydroxide ion in aqueous 2-propanol was reinvestigated. The reaction proceeded actively on irradiation at 365 nm, but very weakly on irradiation at 420 nm. The fluorescence of <B>1</B> was not affected by hydroxide ion. 1,3-Cyclohexadiene as a triplet quencher retarded the photoreduction. All results revealed that the reactive state of <B>1</B> in the photoreduction is not the intramolecular excited CT state, but the upper excited nπ<SUP>*</SUP> triplet state. Kinetic studies indicated that the rate of deactivation from the T<SUB>2</SUB>(<SUP>3</SUP>nπ<SUP>*</SUP>) level of <B>1</B> is unusually slow (<I>k</I><SUB>d</SUB>=1.7×10<SUP>8</SUP> s<SUP>−1</SUP>). The photoreduction <I>via</I> the upper excited T<SUB>2</SUB>(<SUP>3</SUP>nπ<SUP>*</SUP>) level was also observed in 1-amino- and 1-piperidinoanthraquinone, while 2-aminoanthraquinone did not exhibit any reactivity. Wavelength-dependencies (313 nm, 365 nm, and >420 nm irradiations) of the photoreductions were also observed.

• 公益社団法人 日本化学会の論文

著者

• Inoue Haruo

  Department Of Applied Chemistry Graduate Course Of Engineering Tokyo Metropolitan University

• Kitamura Noboru

  Department Of Chemistry Faculty Of Science Hokkaido University

• Hida Mitsuhiko

  Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University

• Kawabe Kiyoshi

  Department of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University

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