Analysis of Ion-association Equilibrium of Precipitable Dipicrylaminate Ion in Aqueous Solution by Capillary Zone Electrophoresis

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  • TAKAYANAGI Toshio
    Department of Life System, Institute of Technology and Science, The University of Tokushima
  • OGURA Kinuyo
    Faculty of Engineering, The University of Tokushima
  • YABUTANI Tomoki
    Department of Life System, Institute of Technology and Science, The University of Tokushima

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The ion-association equilibrium of the dipicrylaminate ion (DPA−) was investigated in an aqueous solution with alkali metal ions and with its 18-crown-6 ether complexes as pairing cations by capillary zone electrophoresis (CZE). Although DPA− is precipitable with the pairing cations of K+ and Cs+ in a homogenous aqueous solution, a low concentration of DPA− below its solubility suppressed the formation of the precipitates, and DPA− was detected as a usual CZE signal. Changes in the electrophoretic mobility of DPA− was analyzed for its ion-association equilibrium. The ion association constants determined were almost comparable among alkali metal ions, while the ion association constants were meaningfully large with a hydrophobic 18-crown-6 ether complex of K+. The CZE separation was also proved to be useful for the equilibrium analysis under precipitating conditions. It was suggested that the precipitable property of DPA− with K+ and Cs+ could not be attributed to the ion-association process in an aqueous solution, but to the condensation process concerning the intermolecular CH···O bond in the precipitate crystals, as reported.

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  • Analytical Sciences

    Analytical Sciences 30 (9), 919-924, 2014

    社団法人 日本分析化学会

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