Solvent extraction of barium picrate by p-tert-butylcalix[4]arene-tetrakis (N,N-diethylacetamide) |
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| Authors: | E Makrlík P Vaňura |
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| Institution: | (1) Faculty of Applied Sciences, University of West Bohemia, Husova 11, 306 14 Pilsen, Czech Republic;(2) Prague Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic |
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| Abstract: | Summary From extraction experiments andg-activity measurements, the extraction constant of the Ba2+(aq)+2A-(aq)+L(nb)?BaL2+(nb)+2A-(nb) equilibrium in the two-phase water-nitrobenzene system (L = p-tert-butylcalix4]arene-tetrakis (N,N-diethylacetamide); aq = aqueous phase, nb = nitrobenzene phase) was evaluated as logKex(BaL2+,2A-)=6.5±0.1. Furthermore, the stability constant of the p-tert-butylcalix4]arene-tetrakis (N,N-diethylacetamide)̵barium complex in nitrobenzene saturated with water was calculated for
at 25 °C as logbnb(BaL2+)=15.4±0.1. |
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