Capillary Electrophoretic Determination of Self-dimerization Constants of Aromatic Carboxylate and Sulfonate Ions

DOI PDF Web Site Web Site Web Site 21 References
  • YOKOYAMA Takashi
    Department of Chemistry, Faculty of Science, Okayama University of Science
  • TSUCHIYA Yasuhide
    Department of Chemistry, Faculty of Science, Okayama University of Science
  • MURAKAMI Gen
    Department of Chemistry, Faculty of Science, Okayama University of Science
  • ZENKI Michio
    Department of Chemistry, Faculty of Science, Okayama University of Science

Search this article

Abstract

Self-dimerizations of twenty three aromatic carboxylate and sulfonate ions from their electrophoretic mobilities in aqueous solution were estimated by capillary zone electrophoresis (CZE). The magnitudes of the self-dimerizations ascribed to π-π interactions of these aromatic anions were determined by CZE as dimerization constants (KD). Although the largest KD value of 1.2 dm3 mol-1 for 9-anthracenecarboxylate ion (9-AC) in these aromatic anions was found, almost all of the KD values were zero, or near to zero. It was found that the π-π interactions of the aromatic anions were relatively small at zero ionic strength, in which the contribution of an ionic association between the cation and aromatic anions could be excluded from the KD values, since the contribution of the electric repulsion between the aromatic anions on the KD values was large. The relatively large KD value of 9-AC caused that it electro-migrates as its planar shape, and has an anthracene ring of a largely hydrophobic aromatic ring.

Journal

  • Analytical Sciences

    Analytical Sciences 22 (6), 807-810, 2006

    The Japan Society for Analytical Chemistry

References(21)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top