Temperature dependence of diffusion of radical intermediates probed by the transient grating method

DOI PDF 被引用文献5件
  • Koichi Okamoto
    Department of Chemistry, Faculty of Science, Kyoto University, Kyoto, 606 Japan
  • Masahide Terazima
    Department of Chemistry, Faculty of Science, Kyoto University, Kyoto, 606 Japan
  • Noboru Hirota
    Department of Chemistry, Faculty of Science, Kyoto University, Kyoto, 606 Japan

書誌事項

公開日
1995-12-22
DOI
  • 10.1063/1.469894
公開者
AIP Publishing

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説明

<jats:p>Diffusion processes of intermediate radicals created by the photoinduced hydrogen abstraction reactions of ketones, quinones, and N-hetero aromatic molecules in ethanol and 2-propanol are studied at various temperatures by using the transient grating (TG) method. The temperature dependences of the translational diffusion coefficients (D’s) of both the radicals and the parent molecules can be expressed by the Arrhenius relationship. The activation energies (ED) for diffusion of the radicals are larger than those of the parent molecules and the difference in ED depends on the molecular size. The different ED is explained in terms of the molecular volume dependence of ED; that is, larger molecular volumes of the radicals could be the cause of the larger ED. The larger apparent molecular volumes of the radicals are consistent with a model of microscopic aggregation of the surrounding molecules around the radical.</jats:p>

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