Study of conformers of 2,2'-, 3,3'-, and 4,4'-dimethylbiphenyls in the phosphorescent triplet states by electron spin resonance and phosphorescence.
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概要
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For the phosphorescent triplet (T<SUB>1</SUB>) states of symmetrically-substituted dimethylbiphenyls, the relationship between the twisting angle of the two aromatic rings and the zero-field splitting parameters is discussed in terms of the ESR spectra. Two sets of ESR spectra observed for 2,2′- and 3,3′-dimethylbiphenyls (2DMBP and 3DMBP) are precisely assigned to the corresponding s-cis or s-trans conformer. The results clarify the inadequate assignment of the spectra of these molecular species in the previous literature. The lifetime obtained for the s-cis conformer is different from that of the s-trans one for both 2DMBP and 3DMBP. Examining the T<SUB>1</SUB>–T<SUB>1</SUB> energy transfer from one conformer to the other, the relative locations for the T<SUB>1</SUB> states of s-cis and s-trans conformers are obtained, even if phosphorescence measurements do not provide each isolated spectrum: <I>E</I><SUB>T</SUB> (<I>s</I>-<I>cis</I>-3DMBP)<<I>E</I><SUB>T</SUB>(<I>s</I>-<I>trans</I>-3DMBP) and <I>E</I><SUB>T</SUB>(<I>s</I>-<I>cis</I>-2DMBP)><I>E</I><SUB>T</SUB>(<I>s</I>-<I>trans</I>-2DMBF).
- 公益社団法人 日本化学会の論文
著者
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Higuchi Jiro
Department Of Applied Chemistry Faculty Of Engineering Yokohama National University
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Tanigaki Katsumi
Department Of Physics Graduate School Of Science Tohoku Univ.:wpi Tohoku Univ.
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Yagi Mikio
Department Of Applied Chemistry Faculty Of Engineering Yokohama National University
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Higuchi Jiro
Department of Physical Chemistry, Faculty of Engineering, Yokohama National University
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Taguchi Noriyuki
Department of Physical Chemistry, Faculty of Engineering, Yokohama National University
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Tanigaki Katsumi
Department of Chemistry, Faculty of Engineering, Yokohama National University
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Yagi Mikio
Department of Physical Chemistry, Faculty of Engineering, Yokohama National University
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