THERMODYNAMICS OF COMPLEXATION OF ZINC(II) WITH CHLORIDE, BROMIDE AND IODIDE-IONS IN HEXAMETHYLPHOSPHORIC TRIAMIDE

被引：17

作者：

ABE, Y ^{[1
]}

ISHIGURO, S ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,DEPT ELECTR CHEM,NIDORI KU,YOKOHAMA,KANAGAWA 227,JAPAN

来源：

JOURNAL OF SOLUTION CHEMISTRY | 1991年 / 20卷 / 08期

关键词：

THERMODYNAMICS OF COMPLEXATION; ZINC(II) HALOGENO COMPLEXES; HEXAMETHYLPHOSPHORIC TRIAMIDE; TITRATION CALORIMETRY;

D O I：

10.1007/BF00675111

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The complexation of zinc(II) with chloride, bromide and iodide ions has been studied by calorimetry in hexamethylphosphoric triamide (HMPA) containing 0.1 mol-dm-3 (n-C4H9)4NClO4 as a constant ionic medium at 25-degrees-C. The formation of [ZnX(n)](2-n)+ (n = 1,2,3,4 for X = Cl; n = 1,2 for X = Br, I) is revealed, and their formation constants, enthalpies and entropies were determined. It is proposed that the zinc(II) ion is four-coordinated in HMPA and the coordinating HMPA molecules are stepwise replaced with halide ions to form [ZnX(n)(hmpa)4-n](2-n)+ (n = 1-4), as is the case for the cobalt(II) ion. Furthermore, the formation of [ZnClI], [ZnBrI], [ZnBrCl] and [ZnBrCl2]- is revealed in the relevant ternary systems. It is found that the affinity of a given halide ion X- to [ZnCl]+, [ZnBr]+ and [ZnI]+ is practically the same.

引用

页码：793 / 803

页数：11

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