Extraction of some univalent cations into nitrobenzene by using a synergistic mixture of sodium dicarbollylcobaltate and barium ionophore I

From extraction experiments and gamma-activity measurements, the exchange extraction constants corresponding to the general equilibrium M(+) (aq) + 1 center dot Na(+) (nb) a double dagger" 1 center dot M(+) (nb) + Na(+) (aq) taking place in the two-phase water-nitrobenzene system (M(+) = Li(+), H(3)O(+), NH(4)(+), Ag(+), K(+), Rb(+), Tl(+), Cs(+), 1 = barium ionophore I; aq = aqueous phase, nb = nitrobenzene phase) were determined. Furthermore, the stability constants of the 1 center dot M(+) complexes in water-saturated nitrobenzene were calculated; they were found to increase in the series of Cs(+) < Rb(+) < NH(4)(+), K(+) < H(3)O(+) < Na(+) < Ag(+), Tl(+) < Li(+).