物理化学学报 >> 1997, Vol. 13 >> Issue (06): 569-572.doi: 10.3866/PKU.WHXB19970617

研究简报 上一篇    下一篇

醇系溶剂中冠醚与碱金属离子的配位反应

易平贵,俞庆森,林瑞森,宗汉兴   

  1. 湘潭矿业学院化工系，湘潭 411201|浙江大学化学系，杭州 310027
  • 收稿日期:1996-10-10 修回日期:1996-12-18 发布日期:1997-06-15
  • 通讯作者: 易平贵

Coordination Reactions of 18-Crown-6 with the Alkali Ions in Alcohol Solvents

Yi Ping-Gui,Yu Qing-Sen,Lin Rui-Sen,Zong Han-Xing   

  1. Department of Chemical Engineering,Xiangtan Mining Institute 411201|Department of Chemistry,Zhejiang University,Hangzhou 310027
  • Received:1996-10-10 Revised:1996-12-18 Published:1997-06-15
  • Contact: Yi Ping-Gui

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关键词: 量热, 配位反应, 18-冠-6, 醇

Abstract:

The enthalpy changes, entropy changes and equilibrium constants of coordination reactions of 18-crown-6 with the alkali ions Na+ and K+ at 298.15K were measured by using RD-496 microcalorimeter with methanol, ethanol, n-propanol and n-butanol as solvents respectively. The results indicated that the enthalpy changes △rHm, entropy changes △rSm, and the stability of the complexes are closely related with the polarity of the solvents, and the order of the stability is ethanol>methanol>n-propanol>n-butanol>H2O for the same complex in the solvents investigated. The stability order was reasonably explained by relating the stability constants of the complexes with the dielectric constants of these solvents, and by using the model of solvated-desolvated ions and ion pair in the coordination reactions.

Key words: Calorimetry, Coordination reaction, 18-crown-6, Alcohol