Synergistic Extraction of Some Univalent Cations into Nitrobenzene by Using Sodium Dicarbollylcobaltate and Dibenzo-21-crown-7

摘要

From extraction experiments and γ-activity measurements, the exchange extraction constants corresponding to the general equilibrium M~+ (aq) ~+ 1·Na~+ (nb) <=> 1·M~+ (nb) ~+ Na~+ (aq) taking place in the two-phase water-nitrobenzene system (M~+ = Li~+, FT, NH~+, Ag~+, K~+, Rb~+, Tl~+, Cs~+; 1 = dibenzo-21-crown-7; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Furthermore, the stability constants of the 1·M~+ complexes in water - saturated nitrobenzene were calculated; they were found to increase in the series of H~+ < Ag~+ < Li~+ < Cs~+ < K~+, Rb~+ < NH_4~+ < Tl~+.