Abstract
From extraction experiments and c-activity measurements, the exchange extraction constants corresponding to the general equilibrium M+ (aq) + CsL+ (nb) , ML+ (nb) + Cs+ (aq) taking place in the two-phase water nitrobenzene system (M+ = K+, Rb+, NH+4,Ag+, Tl+; L = calix[4]arene-bis(t-octylbenzo-18-crown-6); aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Furthermore, the stability constants of the ML+ complexes in nitrobenzene saturated with water were calculated; they were found to increase in the following cation order: NH+4 < K+ < Ag+ < Rb+ < Tl+.
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