Proton transfer in the excited state of 1- and 2-methyl-4-amino-5H-(1)benzopyrano(3,4-c)pyridin-5-one dimers and complexes.
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概要
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The fluorescence rise and decay times and UV absorption spectra of 1-methyl-4-amino-5<I>H</I>-[1]benzopyrano-[3,4-<I>c</I>]pyridin-5-one (1-MBPP), 2-methyl-4-amino-5<I>H</I>-[1]benzopyrano[3,4-<I>c</I>]pyridin-5-one (2-MBPP), and the 1-MBPP/acetic acid and 2-MBPP/acetic acid systems have been measured in hydrocarbon and hydroxylic solvents at room temperature and 77 K. From these data, a rapid formation of proton-transferred species (tautomers) was found to occur in an excited state for 1-MBPP (or 2-MBPP) hydrogen-bonded dimers in hydrocarbon at 77 K, and for 1-MBPP (or 2-MBPP) hydrogen-bonded complexes with acetic acid in hydrocarbon at room temperature and 77 K. The rise times of the tautomer fluorescence for the dimers and complexes were less than 65 ps. The observed fluorescence lifetimes of the 1-MBPP and 2-MBPP monomers agreed well with the lifetimes calculated using the integrated absorption intensity and fluorescence quantum yield.
- 公益社団法人 日本化学会の論文
著者
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Fujimoto Akira
Department Of Electrical Engineering Wakayama National College Of Technology
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NAKAMURA Junko
The Institute of Physical and Chemical Research
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Inuzuka Kozo
Department of Applied Science Tokyo Electrical Engineering College
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Yamazaki Iwao
Institute for Molecular Science
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Murao Toshiro
Institute for Molecular Science
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