Free Radicals Produced from 4, 4'-Dihydroxybiphenyl by Photooxidation

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  • HOSHI Toshihiko
    Department of Chemistry, College of Science and Engineering, Aoyama Gakuin University
  • ONO Isao
    Department of Chemistry, College of Science and Engineering, Aoyama Gakuin University
  • OKUBO Jun
    Department of Chemistry, College of Science and Engineering, Aoyama Gakuin University
  • TANABE Seiichi
    Department of Chemistry, College of Science and Engineering, Aoyama Gakuin University
  • KOBAYASHI Michio
    Department of Chemistry, Nagaoka University of Techology

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Other Title
  • 4, 4'-ジヒドロキシビフェニルの光酸化により生じるフリーラジカル
  • 4 4 ジヒドロキシビフェニル ノ ヒカリ サンカ ニ ヨリ ショウジル フリ

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Description

Photolysis of 4, 4'-dihydroxybiphenyl (BPH2) gave a cation radical (BPH2+·), 4-hydroxy-4'-biphenoxyradical (BPH·) and the conjugate base (BP-·) of BPH· in EPA at 77K. The absorption spectra of the radicals were measured in a wide wavelength region, 350-1000 nm, and the first electronic absorption bands of BPH2+·, BPH· and BP-·. are at 620, 649 and 787 nm, respectively. Irradiation of BPH2 in poly (vinyl alcohol) film at 103 K afforded the mixture of BPH2+· and BP-· BPH2 changed to BP-· predominantly with increasing temperature. The first bands of BPH2+.(640nm) and BP-· (823nm) are polarized along the longer molecular axes. The first transition of BPH2+· corresponds to the transitson from the half-occupied orbital to the lowest vacant orbital, and is interpreted as an intramolecular charge transfer one from the two oxygen atoms to the biphenyl skeleton. The first transition of BP-· corresponds to the transition from the highest occupied orbital to the half-occupied one.

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