Interfacial Behavior of Ionophoric Systems : Molecular Dynamics Studies on 18-Crown-6 and Its Complexes at the Water-Chloroform Interface

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We report a series of molecular dynamics simulations on 18-crown-6 (18C6) uncomplexed, and on its K+ Pic- complexes, at the water-chloroform interface, using an explicit representation of the solvents. The (18C6)10 aggregate, initially at the interface, displays after 1 ns a complex equilibrium between molecules adsorbed at the interface, and others which have diffused to the organic phase. The (18C6·K+Pic-)6 inclusive complexes, initially at the interface, also display after 1 ns, an equilibrium between 18C6 molecules, 18C6·K+ complexes and the Pic- counterions adsorbed at the interface, while some decomplexed K+ cations are captured by water. The spontaneous migration of a 18C6·K+ complex to the organic phase is also observed, facilitated by specific water molecules and the Pic- counterions. Comparison with simulations on the (18C6·K+Pic-)1 and (18C6·Sr2+2Pic-)1 complexes highlights the effect of concentration and of the cationic charge on the interfacial behavior. We finally describe a "computer extraction experiment", which starts with 18C6 molecules in the organic phase and K+Pic- ion pairs in water. The results are discussed in relation with experimental data. We emphasize the surfactant-like behavior of free and complexed extractant molecules, the preorganization of ionophores induced by the interface, and the role of counterions. Surface active anions attract the cations at the interface and facilitate their capture by the adsorbed ionophores. Synergistic effects should result from the adsorption of co-extractant molecules or/and of counterions at the interface.

収録刊行物

  • Analytical sciences : the international journal of the Japan Society for Analytical Chemistry  

    Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 14(1), 43-56, 1998-02-10 

    社団法人 日本分析化学会

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各種コード

  • NII論文ID(NAID)
    10002413917
  • NII書誌ID(NCID)
    AA10500785
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09106340
  • NDL 記事登録ID
    4406421
  • NDL 雑誌分類
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL 請求記号
    Z54-F482
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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