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 |
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Authors: | P Vanura E Makrlík |
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Institution: | (1) Department of Analytical Chemistry, Prague Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic;(2) Institute of Physical Engineering, University of West Bohemia, Veleslavínova 11, 301 14 Pilsen, Czech Republic |
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Abstract: | 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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Keywords: | |
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