Stability constants of cesium complexes with 18-crown-6 in ionic liquids

被引：0

作者：

A. G. Vendilo

H. Rönkkömäki

M. Hannu-Kuure

M. Lajunen

Y. Asikkala

A. A. Petrov

V. G. Krasovsky

E. A. Chernikova

P. Oksman

L. H. J. Lajunen

K. I. Popov

机构：

[1] State Research Institute of Reagents and High-Purity Substances (IREA),Finnish Institute of Occupational Health

[2] Chemical Agents Team,Department of Chemistry

[3] University of Oulu,Department of Physical and Colloid Chemistry

[4] Moscow State University of Food Technologies,Zelinsky Institute of Organic Chemistry

[5] Russian Academy of Sciences,undefined

来源：

Russian Journal of Coordination Chemistry | 2008年 / 34卷

关键词：

Ionic Liquid; 18C6; Stability Constant; Crown Ether; Propylene Carbon;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The stability constants of the complex[Cs(18C6)]+ (18C6 is 18-crown-6 (L)) in N-butylpyridinium methyl sulfate (I) and of the complex [Cs(18C6)2]+ in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (II) were measured by using 133Cs NMR spectroscopy at 23°C. It was found that logK(Cs + L) in solvent I is 1.20±0.13 and logK(CsL + L) in solvent IIis 1.18±0.05. For the complex [Cs(18C6)2]+, the dependence of its stability constant on the temperature in the 23–50°C range was obtained and the enthalpy change in the complexation was determined: ΔH(CsL + L)= −47 kJ/mol. It was demonstrated that the enthalpy change is favorable for the formation of [Cs(18C6)2]+, while the entropy change hinders the complexation.

引用

页码：635 / 640

页数：5

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