ESR Studies of the Conformational Interconversion of the 9,10-Dihydrophenanthrene Radical Anion and Its Related Compounds

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概要

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• The ESR spectra of the 9,10-dihydrophenanthrene radical anion change drastically with the temperature, and at temperatures around −30°C the spectra show a marked line-width alternation effect. These temperature-dependent ESR spectra and the line-width alternation effect have been interpreted in terms of the conformational interconversion of the 9,10-dihydrophenanthrene radical anion molecule. From an analysis of the spectra, the activation energy of the inversion has been estimated to be 6.3±0.6 kcal/mol. It has also been estimated, from the ratio of the axial and equatorial proton splittings, that the dihedral angle of the axial protons is about 11°. These data are compared with those of the 4,5,9,10-tetrahydropyrene radical anion. The ESR of the 4,5-dihydropyrene radical anion is also presented.

• 公益社団法人 日本化学会の論文

著者

• Iwaizumi Masamoto

  The Chemical Research Institute of Non-Aqueous Solutions, Tohoku University

• Isobe Taro

  The Chemical Research Institute of Non-Aqueous Solution, Tohoku University

• Matsuzaki Takashi

  The Chemical Research Institute of Non-Aqueous Solutions, Tohoku University

関連論文

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• ESR Studies of the Conformational Interconversion of the 9,10-Dihydrophenanthrene Radical Anion and Its Related Compounds
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