Electronic and Molecular Structures of a Stable Triplet Species Generated from 2-Nitrobiphenyl after UV Irradiation

Ai Yoshida Department of Chemistry Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558, Japan

Kazunobu Sato Department of Chemistry Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558, Japan

Takeji Takui Department of Chemistry Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558, Japan

Koichi Itoh Department of Material Science, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558, Japan

Michinori Fujisawa Department of Physical Chemistry, Faculty of Engineering, Yokohama National University, Hodogaya-ku, Yokohama, 240, Japan

Mikio Yagi Department of Physical Chemistry, Faculty of Engineering, Yokohama National University, Hodogaya-ku, Yokohama, 240, Japan

Jiro Higuchi Department of Physical Chemistry, Faculty of Engineering, Yokohama National University, Hodogaya-ku, Yokohama, 240, Japan

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Abstract

A stable triplet species of 2-nitrobiphenyl generated by UV irradiation below 120K has been studied by single-crystal ESR and ENDOR spectroscopies. From the angular dependence of ENDOR spectra, all the ¹H-hyperfine coupling tensors were determined. Based on the consideration of the anisotropic terms of the hyperfine coupling tensors, it was concluded that the stable triplet state was formed by the abstraction of a hydrogen atom from the 2′-position of the biphenyl skeleton by the 2-nitro group.

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Electronic and Molecular Structures of a Stable Triplet Species Generated from 2-Nitrobiphenyl after UV Irradiation

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Electronic and Molecular Structures of a Stable Triplet Species Generated from 2-Nitrobiphenyl after UV Irradiation

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