| 镍(Ⅱ)、钴(Ⅱ)、锌(Ⅱ)-N-(间位取代苯基)亚氨基二乙酸体系的量热研究 |
| CALORIMETRIC STUDY OF N-(meta-SUBSTITUTED PHENYL)IMINODIACETIC ACIDS WITH NICKEL(Ⅱ), COBALT(Ⅱ) AND ZINC(Ⅱ) BINARY SYSTEMS |
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| 摘要: 使用改进的RD-1型热导式自动量热计测定了Ni(Ⅱ)、Co(Ⅱ)、Zn(Ⅱ)-N-(间位取代苯基)亚氨基二乙酸三个二元体系的表观生成热。当将其与它们的配体的质子化热相关联时,发现在两者之间存在着良好的直线焓关系。这些金属离子配合物的生成热也符合Irving-Williams序列,即有Co(Ⅱ)Zn(Ⅱ)的顺序。配体上取代基不同,其生成热的大小有Cl->CH3O->H->CH3-的顺序。从两级生成热来比较,有一级大于二级的普遍规律。本文详细地讨论了这些规律。 |
| 关键词: 直线焓关系 N-(取代苯基)亚氨基二乙酸 多环水化结构 氢键 |
| 基金项目: 国家自然科学基金 |
| Abstract: he apparent heats of formation of N-(meta-substituted phenyl) iminodiacetic acids withNi(Ⅱ), Co(Ⅱ) and Zn(Ⅱ) binary systems have been determined in aqueous solution at 25.0±0.2℃, I= 0.1mol·1-1(KNO3) by means of a model RD-1 automatic conduction calorimeter.Some good linear enthalpy relationships were found to exist between the formation heats ofcomplex compounds and the protonation heats of ligands. To compare the formation heats inmetal ions, we found that they obey frying-williams order i.c. Co(Ⅱ) > Ni(Ⅱ) < Zn(Ⅱ). However the enthalpies of protonation of these ligands and that of formation of their metal complexes have positive values (i.e. endothermic) and the magnitude is in an orderCl- >CH3O- > H- > CH3-. A supposed schematic structure of the hydrated ligand have beenoffered for the first bine to explain the cxperimental fact. It was also found that the first stepheats of formation were less than that of the second and a detail discussion has been given forsuch phenomenon. |
| Keywords: linear euthalpy relationship N-(meta-substituted phenyl) iminodiacetic acid hydrogen bonding polycyclic hydrated structure |
| 投稿时间：1992-10-15 |
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| 林华宽,古宗信,陈荣悌.镍(Ⅱ)、钴(Ⅱ)、锌(Ⅱ)-N-(间位取代苯基)亚氨基二乙酸体系的量热研究[J].无机化学学报,1994,10(1):13-18. |
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