Discrimination of Rotational Isomers of Jet-Cooled Acetophenone Derivatives as Studied by Sensitized Phosphorescence Excitation Spectroscopy.
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概要
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The S<SUB>1</SUB>(n,π<SUP>*</SUP>)←S<SUB>0</SUB> and T(n,π<SUP>*</SUP>)←S<SUB>0</SUB> sensitized phosphorescence excitation spectra of jet-cooled <I>o</I>- and <I>m</I>-substituted (fluoro- and methyl-) acetophenones have been measured. The two rotational isomers (<I>O</I>-<I>cis</I> and <I>O</I>-<I>trans</I> isomers) of each molecule arising from the orientation of the acetyl group with respect to <I>o</I>- or <I>m</I>-substituent have been discriminated. The energy difference in the 0–0 transition between the two isomers is less than 100 cm<SUP>−1</SUP> for <I>m</I>-substituted acetophenone but more than 300 cm<SUP>−1</SUP> for <I>o</I>-substituted acetophenone. The characteristic energy difference can be explained from the fact that the electronic excitation is localized on the C=O group.
- 公益社団法人 日本化学会の論文
著者
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Ito Mitsuo
Department Of Chemistry And Fuel Research Japan Atomic Energy Research Institute
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Yamamoto Seiji
Department of Chemistry, Faculty of Science, Tohoku University
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Hashimoto Nobuhisa
Department of Chemistry, Faculty of Science, Tohoku University
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