Analysis of Complex Formation Equilibrium of Phenylalkylammonium Ions with 18-Crown-6 by Capillary Zone Electrophoresis

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  • Inoue Genki
    Department of Chemistry, Faculty of Science, Okayama University
  • Takayanagi Toshio
    Department of Chemistry, Faculty of Science, Okayama University Department of Chemistry and Biochemistry, 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１８‐クラウン‐６とフェニルアルキルアンモニウムの錯形成反応の解析
  • キャピラリーゾーン電気泳動法による18-クラウン-6とフェニルアルキルアンモニウムの錯形成反応の解析
  • キャピラリー ゾーン デンキ エイドウホウ ニ ヨル 18 クラウン 6 ト フェニルアルキルアンモニウム ノ サクケイセイ ハンノウ ノ カイセキ

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Abstract

Complex formation equilibrium of phenylalkylammonium ions (PAA+) with 18-crown-6 (18C6) has been analyzed by capillary zone electrophoresis (CZE). The electrophoretic mobility of PAA+ (μep') was measured by CZE in the presence of 18C6 in a migrating buffer, and the μep' values were used for equilibrium analysis. The μep' values decreased with increasing concentrations of 18C6, and 1 : 1 complex formation constants, K, were determined. The K values for PAA+ in an aqueous solution are comparable to literature data reported for the ammonium ion. The K values increased with a longer alkyl chain in PAA+, except for the benzylammonium ion. The results suggested the contribution of hydrophobicity in PAA+, as well as CH/π interactions for the benzylammonium ion. The K values also increased in mixed aqueous solvents with a decreased dielectric constant, which suggested the contribution of ion-dipole interaction in the complex formation reaction.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 59 (8), 709-713, 2010

    The Japan Society for Analytical Chemistry

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