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：
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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.
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页码：635 / 640
页数：5
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