Selective hydrogen atom abstraction by H atoms in radiolysis and photolysis at 77 K: Decane-d22, tetramethylsilane, and xenon matrices.
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概要
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The selective formation of HD and solute radicals in the radiolysis of <I>n</I>-C<SUB>10</SUB>D<SUB>22</SUB> doped with <I>n</I>-C<SUB>10</SUB>H<SUB>22</SUB> at 77 K is explained quantitatively by the mechanism of a selective hydrogen-atom-abstraction reaction by D atoms. The selective hydrogen-atom abstraction by H atoms is found also in tetramethylsilane and xenon matrices as well as in the alkane matrix. The rate constants of the abstraction reaction by H atoms are compared with the bond energies of the solvent and solute molecules. The bond energy of the solvent molecule is always higher than that of the solute molecule. Even if the difference in the bond energy between the solvent and the solute is very small, the <I>k</I>(solute)/<I>k</I>(solvent) ratio is quite large. The <I>k</I>(solute)/<I>k</I>(<I>neo</I>-C<SUB>5</SUB>H<SUB>1</SUB>2) ratios for different solutes in a neopentane matrix are not influenced by the differences in the bond energy among the solutes. Since an isotope effect on the selective hydrogen-atom abstraction reaction is small, the effect may diminish the possibility of the quantum mechanical tunneling abstraction by thermal H atoms. The energy loss of hot H atoms in a Xe matrix is discussed.
- 公益社団法人 日本化学会の論文
著者
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Miyazaki Tetsuo
Department Of Applied Chemistry Graduate School Of Engineering Nagoya University
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Wada Manabu
Department Of Neurology Hematology Metabolism Endocrinology And Diabetes Yamagata University School
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Miyazaki Tetsuo
Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University
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Kasugai Joji
Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University
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Kinugawa Kazuhisa
Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University
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