Experimental Evidence for a Calix[4]arene-Proton Complex |
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| Authors: | Emanuel Makrlík and Petr Vaňura |
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| Institution: | (1) Faculty of Applied Sciences, University of West Bohemia, Pilsen, Czech Republic;(2) Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic;(3) Institute of Chemical Technology, Prague, Czech Republic |
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| Abstract: | From extraction experiments and γ-activity measurements, the extraction constant corresponding to the equilibrium H+(aq) + 1
·Na+(nb) ⇆ 1
·H+(nb) + Na+(aq) taking place in the two-phase water-nitrobenzene system (1 = p-tert-butylcalix4]arene-tetrakis(N, N-diethylacetamide); aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log K
ex(H+, 1
·Na+) = −1.4 ± 0.1. Further, the stability constant of the p-tert-butylcalix4]arene-tetrakis(N,N-diethylacetamide)-H+ complex in water saturated nitrobenzene was calculated for a temperature of 25°C as log βnb(1
· H+) = 8.1 ± 0.1. |
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| Keywords: | |
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