HIGHLY AG+-SELECTIVE PODANDS - THERMODYNAMICS OF COMPLEXATION AND MEMBRANE-TRANSPORT

被引：24

作者：

LEE, SS ^{[1
]}

JUNG, JH ^{[1
]}

YU, SH ^{[1
]}

CHO, MH ^{[1
]}

机构：

[1] KANGWEON NATL UNIV,DEPT CHEM,CHUNCHON 200701,SOUTH KOREA

来源：

THERMOCHIMICA ACTA | 1995年 / 259卷 / 01期

关键词：

COMPLEXATION; MEMBRANE TRANSPORT; PODAND; SILVER ION; THERMODYNAMIC PARAMETERS;

D O I：

10.1016/0040-6031(95)02266-5

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Delta H values for the 1:1 interaction of some sulfur-containing podands with Ag+, K+, Cu2+, Cd2+ and Pb2+ have been measured by calorimetry in methanol, For the Ag+ complexation, log K values were determined by potentiometry using an Ag+-ISE and, in this case, T Delta S could be obtained. The complexations were enthalpy driven and Ag+ exhibited remarkably higher complexation selectivity due to the increase of covalent binding between soft acid and soft base. The reaction enthalpy and entropy are discussed in terms of donor atom, end group and donor site effects, respectively. In the membrane transport study, efficient and highly selective Ag+ transfer was observed both in single and competitive cation experiments.

引用

页码：133 / 141

页数：9

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