Binding Analysis of 1-Alkyl-3-methylimidazolium Ions to Nonionic Surfactant Micelles by Capillary Zone Electrophoresis

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  • TAKAYANAGI Toshio
    Graduate School of Natural Science and Technology, Okayama University Present address, Institute of Technology and Science, The University of Tokushima
  • IKUTA Ayumi
    Graduate School of Natural Science and Technology, Okayama University

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Other Title
  • キャピラリーゾーン電気泳動法による1-アルキル-3-メチルイミダゾリウムイオンの非イオン界面活性剤ミセルへの結合反応解析
  • キャピラリーゾーン デンキ エイドウホウ ニ ヨル 1-アルキル-3-メチルイミダゾリウムイオン ノ ヒイオン カイメン カッセイザイ ミセル エ ノ ケツゴウ ハンノウ カイセキ

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Abstract

The binding constants (KB) of four kinds of 1-alkyl-3-methylimidazolium ions to nonionic surfactant micelles have been determined through changes in the electrophoretic mobility in capillary zone electrophoresis. Larger binding constants were obtained with much bulky 1-alkyl-3-methylimidazolium ions. A linear free-energy relationship was observed with the KB values against the van der Waals volume of the cations. The KB values obtained with 1-alkyl-3-methylimidazolium ions are almost comparable with a series of N-alkylpyridinium ions previously reported. Both the binding constants and the linear free-energy relationship are smaller than the binding of anionic alkylbenzene sulfonate ions. The results have suggested a weak binding of cations to nonionic surfactant micelles.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 61 (7), 649-654, 2012

    The Japan Society for Analytical Chemistry

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