Kinetic studies of the electron transfer reactions in Iron(II) and Iron(III) systems. IX. Electron transfer reactions between Iron(II) and Iron(III) in water mixed with ethanol, 1-propanol, ethylene glycol, glycerol, and pentaerythritol.
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概要
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The rate constants of the electron transfer reactions between Fe(II) and Fe(III) were determined in mixed solvents of water and alcohols, such as ethanol, 1-propanol, ethylene glycol, glycerol, and pentaerythritol. From the acid concentration dependence of the rate, the predominant path of the reaction was estimated to be Fe<SUP>2+</SUP>-Fe(OH)<SUP>2+</SUP> path with a rate constant <I>k</I><SUB>H</SUB>. The rate constant <I>k</I><SUB>H</SUB> increases with increase in the mole fraction <I>x</I> of ethanol and 1-propanol, and decreases with increase in <I>x</I> of methanol, ethylene glycol, glycerol, and pentaerythritol. A straight line is obtained when In <I>k</I><SUB>H</SUB> is plotted against the reciprocal dielectric constant <I>D</I><SUP>−1</SUP> of the mixed solvents for the latter group of alcohols. From the slope of the straight line the distance between Fe<SUP>2+</SUP> and Fe(OH)<SUP>2+</SUP> is estimated to be 7.8 Å at the intermediate stage of the reaction. Therefore, the reaction is mostly controlled by the electrostatic repulsive force, being influenced by <I>D</I> of the mixed solvents.
- 公益社団法人 日本化学会の論文
著者
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Hayashida Sachiko
Department Of Bioscience And Biotechnology Division Of Bioresource And Bioenvironmental Sciences Fac
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Wada Goro
Department of Chemistry, Faculty of Science, Nara Women s University
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Hayashida Sachiko
Department of Chemistry, Faculty of Science, Nara Women s University
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Ohta Youko
Department of Chemistry, Faculty of Science, Nara Women s University
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Sugino Harumi
Department of Chemistry, Faculty of Science, Nara Women s University
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Mizui Toyomi
Department of Chemistry, Faculty of Science, Nara Women s University
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Aihara Yumiko
Department of Chemistry, Faculty of Science, Nara Women s University
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