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化学学报
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化学学报 ›› 1997, Vol. 55 ›› Issue (11): 1066-1071. 上一篇    下一篇

研究论文

镍, 锌, 钴(II)-N-(间甲苯基)亚氨基二乙酸-氮三乙酸的量热研究

周志芬;林华宽;朱守荣;卢祥生;陈荣悌   

  1. 南开大学化学系
  • 发布日期:1997-11-15

Calorimetric study of Ni(II), Zn(II), Co(II)-N-(meta-substituted phenyl) iminodiacetic acid-nitrilotriacetic acid ternary systems

ZHOU ZHIFEN;LIN HUAKUAN;ZHU SHOURONG;LU XIANGSHENG;CHEN RONGTI   

  • Published:1997-11-15

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使用改进的RD-1型热导式量热计测量了镍(II), 锌(II),钴(II)-N-(间甲苯基)亚氨基二乙酸-氮三乙酸三元配合物的生成焓, 发现其大小按金属离子来说符合Irving-William序列。利用配体的多环水化结构等讨论了该三元配合物的生成焓和相应的二元配合物的生成焓, 同时求得了上述三元体系的热力学参数, 指出上述三元体系的生成熵是导致这些三元体系具有较大稳定性的根本原因。

关键词: 锌络合物, 三元络合物, 氢键, 钴络合物, 镍络合物, 甲苯 P, 亚胺二乙酸 P

The protonation heats of N-(meta-substituted phenyl) iminodiacetic acid (m-CH3PhIDA), the heats of formation of Ni(II), Zn(II), Co(II)-m-CH3PhIDA binary systems and Ni(II), Zn(II), Co(II)-m-CH3PhIDA-nitrilotriacetic acid (NTA) ternary systems have been determined in aqueous solution at 25.0±0.2℃, I=0.1 mol.dm^-^3(NaClO4) by means of a model RD-1 automatic conduction calorimeter. To compare the formation heats for metal ions, we found that they obey Irving-Williams order, i.e. Co(II)Zn(II). A supposed structure of the hydrated ligand has been offered to discuss the formation heats of ternary complexes M(II)-m-CH3PhIDA-NTA and of binary complexes M(II)-m-CH3PhIDA.

Key words: ZINC COMPLEX, TERNARY COMPLEX, HYDROGEN BONDS, COBALT COMPLEX, NICKEL COMPLEX, METHYLBENZENE P, IMIDO-ACETIC ACID P

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