Stability of Complexes of NH4+ with 18-Crown-6, Dicyclohexyl-18-Crown-6, Dibenzo-18-Crown-6 and Dibenzo-24-Crown-8 in Water Saturated Nitrobenzene

被引：0
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作者：
P. Vanura
E. Makrlík
机构：
[1] Prague Institute of Chemical Technology,Department of Analytical Chemistry
[2] University of West Bohemia,Institute of Physical Engineering
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2001年 / 250卷
关键词：
Physical Chemistry; Inorganic Chemistry; Aqueous Phase; 18C6; Stability Constant;
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摘要：
From extraction experiments with 22Na tracer, the exchange extraction constants corresponding to the NH4+(aq) + NaL+ (nb)⇄NH4L+(nb) + Na+ (aq) equilibrium taking place in the two-phase water-nitrobenzene system (L = 18-crown-6, dicyclohexyl-18-crown-6, dibenzo-18-crown-6 and dibenzo-24-crown-8; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Furthermore, the stability constants of the NH4L+ complexes in nitrobenzene saturated with water were calculated; they were found to increase in the order dibenzo-24-crown-8 (DB24C8) < dibenzo-18-crown-6 (DB18C6) < dicyclohexyl-18-crown-6 (DCH18C6) < 18-crown-6 (18C6).
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页码：369 / 371
页数：2
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