Photolytic generation and the subsequent dimerization of 4-alkyl-1-methylpyridinyl radicals in solution as studied by steady-state and kinetic ESR spectroscopy.

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概要

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• 1-Methylpyridinyl and 4-alkyl-1-methylpyridinyl (alkyl=methyl, ethyl, isopropyl, and <I>t</I>-butyl) radicals were generated photolytically from their dimers in solution. Hyperfine splitting constants for these radicals were assigned and the temperature dependence was discussed. Absolute dimerization rates of these radicals in the range of −50–−100 °C were determined by analyzing the ESR signal decay during the dark period. A nearly constant activation energy of dimerization was observed for five radicals, while the frequency factor decreased with the bulkiness of 4-substituent, which are discussed in terms of the steric hindrance for the dimerization.

• 公益社団法人 日本化学会の論文

著者

• Tero-kubota Shozo

  Institute For Chemical Reaction Science Tohoku University

• Ikegami Yusaku

  Chemical Research Institute Of Non-aqueous Solutions

• Akiyama Kimio

  Chemical Research Institute of Non-Aqueous Solutions, Tohoku University

• Tero-Kubota Shozo

  Institute for Molecular Science

• Ishii Toru

  Chemical Research Institute of Non-Aqueous Solutions, Tohoku University

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