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Solvent extraction of europium trifluoromethanesulfonate into nitrobenzene in the presence of p-tert-butylcalix[6]arene and p-tert-butylcalix[8]arene |
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| Authors: | Emanuel Makrl??k P Va??ura P Selucky |
| Institution: | 1. Faculty of Applied Sciences, University of West Bohemia, Husova 11, 306 14, Pilsen, Czech Republic 2. Department of Analytical Chemistry, Institute of Chemical Technology, Prague, Technick?? 5, 166 28, Prague 6, Czech Republic 3. Nuclear Research Institute, 250 68, ?e?, Czech Republic |
| Abstract: | From extraction experiments and ??-activity measurements, the extraction constants corresponding to the general equilibrium Eu3+(aq) + 3A?(aq) + L(nb) ? EuL3+(nb) + 3A?(nb) taking part in the two-phase water?Cnitrobenzene system (A? = CF3SO3 ?; L = p-tert-butylcalix6]arene, p-tert-butylcalix8]arene; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Further, the stability constants of the EuL3+ complexes in nitrobenzene saturated with water were calculated for a temperature of 25 °C as log ?? nb(EuL3+) = 6.4 ± 0.1 (L = p-tert-butylcalix6]arene) and log ?? nb(EuL3+) = 11.3 ± 0.1 (L = p-tert-butylcalix8]arene). |
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