高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (9): 1567.

• 论文 • 上一篇    下一篇

双层夹心膜电极电位法测定溶剂聚合物膜中杯芳烃-金属离子配合物的生成常数

狄晓威1,2, 何锡文1   

  1. 1. 南开大学化学系元素有机化学国家重点实验室, 天津 300071;
    2. 内蒙古大学化学系, 呼和浩特 010021
  • 收稿日期:2002-03-21 出版日期:2003-09-24 发布日期:2003-09-24
  • 通讯作者: 何锡文(1939年出生),男,教授,博士生导师,主要从事分子识别及分子模板领域的研究.E-mail:xiwenhe@nankai.edu.cn E-mail:xiwenhe@nankai.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29975014和20175009);教育部博士学科点专项基金(批准号:20020055002)

Potentiometric Determination of Formation Constants of Complex of Calix[6]arene Ester with Metal Ions in Solvent Polymeric Membrane with Two-layer Sandwich Membrane Electrode

DI Xiao-Wei1,2, HE Xi-Wen1   

  1. 1. State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China;
    2. Department of Chemistry, Inner Mongolia University, Huhehaote 010021, China
  • Received:2002-03-21 Online:2003-09-24 Published:2003-09-24

PDF (PC)

被引次数

37

摘要： 以双层夹心膜电极为指示电极,采用电位法测定了聚合物膜中活性离子载体杯[6]芳烃乙酯与金属离子形成的配合物的生成常数.提出了一种新的测定夹心膜膜电位的方法,由测得的膜电位可计算出配合物的生成常数.以杯[6]芳烃乙酯为离子载体,测得其与Li+,Na+,K+,Cs+和NH+4等离子的配合物生成常数的对数值分别为6.14,6.48.6.74,7.43和6.21.制备了以Cs+为主离子的选择性电极,采用固定干扰法,测得对Li+,Na+,K+和NH+4等离子的选择性系数的对数值分别为-3.33,-2.54,-1.6和-2.9.实验结果表明,配合物的生成常数与选择性系数之间有较好的相关性.生成常数越大,电极对相应离子的选择性越高.

关键词: 杯[6]芳烃乙酯, 双层夹心膜, 电位法, 配合物生成常数

Abstract: Atwo-layer sandwich membrane was used as the indicator electrode to determine the formation constants of the complexes of tert-butyl-calix[6]arene hexaacetic acid hexaethyl ester with metal ions in solvent polymeric membrane potentiometrically. Anew method for the measurement of sandwich membrane potential from which the formation constant of the complex can be calculated was proposed. Calix[6]arene ester was used as ionophore and the complex formation constants of it with Li+, Na+, K+, Cs+and NH4+were determined. The logarithmic values of the formation constants were found to be 6. 14, 6. 48, 6. 74, 7. 43 and 6. 21 respectively. According to the experimental data, Cs+was chosen as the primary ion because of its highest value of complex formation constant and a Cs-selective electrode was prepared. The resulting logarithmic selectivity coefficients to the ions of Li+, Na+, K+and NH4+are found to be -3. 33, -2. 54, -1. 60 and - 2. 90 respectively by fixing interference method (FIM). From the data of both formation constants and selectivity coefficients, a good correlation between them was found. The higher the formation constant of the complex of calix[6]arene ester with the responded ion is, the higher the selectivity to it is.

Key words: Calix[6]arene ester, Two-layer sandwich membrane, Potentiometry, Complex formation con-stant

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