Abstract
ABSTRACTOn the basis of extraction experiments and γ-activity measurements, the extraction constant corresponding to the equilibrium Ag+(aq) + 1·Cs+ (nb) 1·Ag+(nb) + Cs+ (aq) occurring in the two-phase water–nitrobenzene system (1 = calix[4]arene-(1,2-phenylene-crown-6,crown-6); aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log Kex(Ag+, 1·Cs+) = −1.3 ± 0.1. Further, the very high stability constant of the 1·Ag+ complex in nitrobenzene saturated with water was calculated for a temperature of 25 °C: log βnb(1·Ag +) = 9.3 ± 0.2. Finally, by using quantum mechanical DFT calculations, the most probable structures A and B of this cationic complex species, which are obviously in a dynamic equilibrium, were derived.
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