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Citation: Yi Ping-Gui, Yu Qing-Sen, Lin Rui-Sen, Zong Han-Xing. Coordination Reactions of 18-Crown-6 with the Alkali Ions in Alcohol Solvents[J]. Acta Physico-Chimica Sinica, ;1997, 13(06): 569-572. doi: 10.3866/PKU.WHXB19970617 shu

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

1.
Department of Chemical Engineering,Xiangtan Mining Institute 411201

Received Date: 10 October 1996
Available Online: 15 June 1997

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.
- Calorimetry,
- Coordination reaction,
- 18-crown-6,
- Alcohol
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