物理化学学报 >> 1994, Vol. 10 >> Issue (03): 212-216.doi: 10.3866/PKU.WHXB19940305

研究论文 上一篇    下一篇

镍、锌、钴(II)-N-(对位取代苯基)亚氨基二乙酸的量热

林华宽, 卢祥生, 古宗信, 李卫红, 陈荣悌   

  1. 南开大学化学系,天津 300071
  • 收稿日期:1992-08-12 修回日期:1993-01-05 发布日期:1994-03-15
  • 通讯作者: 林华宽

Calorimetric Study of Ni(II), Co(II), Zn(II)-N-(para-cubstitutd Pheny1) Iminodiacetic Acid

Lin Hua-Kuan, Lu Xiang-Sheng, Gu Zong-Xin, Li Wei-Hong, Chen Rong-Ti   

  1. Department of Chemistry, Nankai University, Tianjin 300071
  • Received:1992-08-12 Revised:1993-01-05 Published:1994-03-15
  • Contact: Lin Hua-Kuan

摘要:

使用改进的RD-1型热导式量热计测定了镍(Ⅱ)-、钴(Ⅱ)-、锌(Ⅱ)-N-(对位取代苯基)亚氨基二乙酸等三个二元配位体系的生成热.这些配合物的生成热不仅与配体的质子化热之间存在着线性关系,而且它们的大小按金属离子来说是完全符合Irving-Williams序列的,并利用配体的多环水化结构解释了N-(取代苯基)亚氨基二乙酸根质子化热呈正值(吸热)的实验事实。

关键词: 直线焓关系, 多环水化结构, 氢键

Abstract:

The formation heats of binary complex compounds formed from N-(para substituted phenyl) iminodiacetic acid (p-RPhIDA) with Ni(Ⅱ), Co(Ⅱ) and Zn(Ⅱ) have been determined by means of a model RD-1 conduction automatic calorimeter at 25.0±0.2 ℃ in the presence of KNO_3 (0.1 mol·L~(-1)). It was found that linear enthalpy relation ships not only did exist between the formation heats of the binary complex compounds (Ni(Ⅱ )-, Co(Ⅱ)-, Zn(Ⅱ)-p-RPhIDA) and the protonation heats of p-RPhIDA but the order of maghitude of these formation heats is in agreement with Irving-Willams order for the metal ions. The experimental fact of positive (endothermic) protonation heats of p-RPhIDA has been explained by means of polyring hydration structure of N-(para-substituted phenyl) iminodiacetate.

Key words: LER, Polyring structure of hydration, Hydrogen bonding