The conformers of 2,2'-bipyridine in the phosphorescent triplet state as studied by electron spin resonance and phosphorescence.
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概要
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Two sets of triplet-state ESR spectra corresponding to the <I>s</I>-<I>cis</I> and <I>s</I>-<I>trans</I> conformers of 2,2′-bipyridine have been observed in mixtures of water with various alcohols at 77K. The intensity ratio of the ESR signal for the <I>s</I>-<I>cis</I> conformer to that for the <I>s</I>-<I>trans</I> conformer depends on the composition of the mixture and on the sample-cooling rate. From the analysis of the phosphorescence spectra, the lowest triplet state of the <I>s</I>-<I>cis</I> conformer is estimated to be close to that of the <I>s</I>-<I>trans</I> conformer. An anomalous ESR signal which cannot be ascribed to either the <I>s</I>-<I>cis</I> conformer or the <I>s</I>-<I>trans</I> conformer has been observed in a 1-propanol-water mixture. The geometries of these conformers are discussed from their observed zero-field splitting parameters, together with their potential energy diagrams, as obtained by an <I>ab initio</I> calculation.
- 公益社団法人 日本化学会の論文
著者
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Nagase Shigeru
Department Of Chemistry Faculty Of Education Yokohama National University
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Higuchi Jiro
Department Of Applied Chemistry Faculty Of Engineering Yokohama National University
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Yagi Mikio
Department Of Applied Chemistry Faculty Of Engineering Yokohama National University
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Suzuki Kazuhiro
Department Of Cardiovascular Surgery Yamaguchi Grand Medical Center
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Makiguchi Kazuhiro
Department of Chemistry, Faculty of Engineering, Yokohama National University
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Ohnuki Atsushi
Department of Chemistry, Faculty of Engineering, Yokohama National University
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