Facilitated Transfer of Alkali and Alkaline Earth-metal Ions to the Oil | Water Interface Where the Fluorescent Dye diOC<sub>2</sub>(3) is Adsorbed

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  • MORIGUCHI Mika
    Department of Chemistry, Graduate School of Science, Kobe University
  • NAGATANI Hirohisa
    Faculty of Chemistry, Institute of Science and Engineering, Kanazawa University
  • EDA Kazuo
    Department of Chemistry, Graduate School of Science, Kobe University
  • OSAKAI Toshiyuki
    Department of Chemistry, Graduate School of Science, Kobe University

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Other Title
  • 蛍光色素diOC<sub>2</sub>(3)が吸着した油水界面へのアルカリ金属・アルカリ土類金属イオンの促進移動
  • 蛍光色素diOC₂(3)が吸着した油水界面へのアルカリ金属・アルカリ土類金属イオンの促進移動
  • ケイコウ シキソ diOC ₂(3)ガ キュウチャク シタ ユスイ カイメン エ ノ アルカリ キンゾク ・ アルカリ ドルイキンゾク イオン ノ ソクシン イドウ

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Abstract

At the 1,2-dichloroethane (DCE) | water (W) interface upon the addition of a monocationic membrane-potential-sensitive dye, 3,3'-diethyloxacarbocyanine {diOC2(3)}, an extraordinarily large voltammetric wave, was observed. This was probably due to a facilitated transfer of the supporting-electrolyte cation in W (i.e., Li+, Na+, K+, Mg2+, Ca2+). In order to explain the mechanism, we also carried out a determination of the double-layer capacity of the interface by ac voltammetry and potential-modulated fluorescence (PMF) spectroscopy measurements. The results have suggested that monocationic diOC2(3) and the supporting-electrolyte anion in DCE {tetrakis(4-chlorophenyl)borate} are co-adsorbed (probably in multilayers) at the DCE | W interface and, into the adsorption layer, the above cations of small sizes are intercalated, and thus transferred more easily. This facilitation effect is more significant for alkali-earth metal ions than for the alkali metal ions. A possible application has been suggested concerning the voltammetric or fluorescence determination of Mg2+ and/or Ca2+ (e.g., water hardness analysis).

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 65 (2), 71-77, 2016

    The Japan Society for Analytical Chemistry

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