The Primary Photochemical Process of Isoquinoline <I>N</I>-Oxide in Hydroxylic Solvents

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概要

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• In order to deduce the nature of the reactive state of the photochemical isomerization of isoquinoline <I>N</I>-oxide in methanol or water, investigations by means of steady-light irradiation and flash spectroscopy were carried out under various conditions. Transient absorptions were observed in the spectral region between 360 nm and 600 nm; they were identified as being due to a T–T transition of isoquinoline <I>N</I>-oxide. Experiments on both the measurements of the quantum yields and the decay kinetics of the transient species under different conditions revealed that the excited singlet state of isoquinoline <I>N</I>-oxide was responsible for the isomerization. The photochemical behavior in aqueous solutions at various pH values was also examined; consequently, the photochemical isomerization was found to be independent of the hydrogen ions, although it did not occur in a strongly acidic solution (pH<3.0) because of the formation of the protonated <I>N</I>-oxide. The biacetyl-photosensitization for isoquinoline <I>N</I>-oxide led to the dissociation of the N–O bond instead of to isomerization.

• 公益社団法人 日本化学会の論文

著者

• Ono Isao

  Department Of Chemistry College Of Science And Engineering Aoyama Gakuin University

• Hata Norisuke

  Deparment of Chemistry, College of Science and Engineering, Aoyama Gakuin University

• Hata Norisuke

  Department of Chemistry, Faculty of Science and Engineering, Aoyama Gakuin University

• Ono Isao

  Department of Chemistry, Faculty of Science and Engineering, Aoyama Gakuin University

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