Free radicals produced from the derivatives of pyrylium salts in solution by photoillumination.

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概要

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• The photoreactions of 2,4,6-triphenyl- (TPP), 2-<I>t</I>-butyl-4,6-diphenylpyrylium (2BDPP) and 2,4,6-triphenylthiopyrylium (TPTP) salts in tetrahydrofuran (THF) and/or 1,2-dimethoxyethane were investigated. Photoproducts were identified to be pyranyl radicals on the basis of photochemical behavior and ESR spectra. Quantum yields of one-electron reduction reactions of TPP, 2BDPP, and TPTP were obtained to be 0.21, 0.047, and 0.53, respectively. The hf coupling constants of protons in the radicals were determined by simulation. The photoillumination of TPP in THF at low temperatures revealed that a certain intermediate radical species was involved in this one-electron photoreduction.

• 公益社団法人 日本化学会の論文

著者

• Toda Takashi

  Department Of Applied Chemistry Faculty Of Engineering Utsunomiya University

• NIIZUMA Shigeya

  College of Humanities and Social Science, Iwate University

• Suzuki Yoshizo

  Faculty of Education, Iwate University

• Kawata Hiroki

  College of Humanities and Social Sciences, Iwate University

• Kokubun Hiroshi

  Department of Chemistry, Faculty of Science, Tohoku University

• Sato Nobuyoshi

  College of General Education, Iwate University

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