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From extraction experiments and  γ -activity measurements, the exchange extraction constants corresponding to the general equilibrium M + (aq)+NaL + (nb)⇔ML + (nb)+Na + (aq) taking place in the two-phase water-nitrobenzene system (M + =Li + , Ag + , Rb + , Tl + , Cs + ; L= p-tert -butylcalix[4]arene-tetrakis( N,N -diethylacetamide); aq=aqueous phase, nb=nitrobenzene phase) were determined. Moreover, the stability constants of the ML +  complexes in water-saturated nitrobenzene were calculated; they were found to increase in the cation order Cs +  &lt; Rb +  &lt; Tl +  &lt; Ag +  &lt; Li + .

zeitschrift für physikalische chemie

Contribution to the Complexation of some Univalent Metal Cations with  p-Tert -Butylcalix[4]arene-Tetrakis( N,N -Diethylacetamide) in Nitrobenzene Saturated with Water