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化学学报
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化学学报 ›› 1992, Vol. 50 ›› Issue (10): 1000-1004. 上一篇    下一篇

研究论文

冠醚配合物的研究XIII:三种大环配体液膜传输碱金属离子的动力学

王志林;沈孟长;罗勤慧   

  1. 南京大学化学系
  • 发布日期:1992-10-15

Studies on crown coordination compounds.XIII.the transport kinetics of alkali metal ions by three methyl derivatives of benzo-18-crown-6

WANG ZHILIN;SHEN MENGCHANG;LUO QINHUI   

  • Published:1992-10-15

PDF

348

被引次数

6

本文报道以2,3-苯并-11-甲基-18-冠-6,2,3-苯并-8,15-二甲基-18-冠-6和2,3-苯并-8-11,15-三甲基-18-冠-6为液膜载体,研究其对碱金属离子的传输,发现当水相金属盐浓度和膜相配体相近时,金属离子的传输为串联一级反应,求得了串级速率常数,并讨论了传输速率和配位作用的关系及载体结构的影响.

关键词: 冠式化合物, 传输, 碱金属离子, 动力学研究, 液膜载体

The transport of alkali metal ions was studied in liquid membrane systems based on 2,3-benzo-11-methyl-18-crown-6 (I), 2,3-benzo-8,15-dimethyl-18-crown-6 (II), and 2,3-benzo-8,11,15-trimethyl-18-crown-6 (III). Metal ion migration involves a pair of consecutive 1st order processes when the metal ion concentration in the aqueous phase and the crown carrier concentration in the membrane phase are comparable. The rate constants for Na+, K+, and Rb+ complexes are k1 = 0.142, 0.180, 0.162 h-1 (I), 0.136, 0.165, 0.145 h-1 (II), and 0.130, 0.141, 0.123 h-1 (III) and k2 = 0.213, 0.198, 0.211 h-1 (I), 0.211, 0.201, 0.205 h-1 (II), and 0.195, 0.193, 0.197 h-1 (III), resp. The effects of carrier structure and coordination capacity on cation transport are discussed.

Key words: CROWN ETHER COMPOUNDS, TRANSMISSION, ALKALI METAL ION, KINETIC STUDY

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