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From extraction experiments, the exchange extraction constants corresponding to the general equilibriums M +  (aq) + NaL +  (org) ⇔ ML +  (org) + Na +  (aq) or M +  (aq) + CsL +  (org) ⇔ ML +  (org) + Cs +  (aq), which take place in the two-phase water–nitrobenzene extraction system (M +  = Li + , H 3 O + , Ag + , K + , NH 4  + , Tl + , Rb + ; L = calix[4]arene-bis crown5(1,3- alternate ), 26,28-dipropoxycalix[4]arene-crown-5(1,3- alternate ), 11,23-dibromo-25,28-dipropoxycalix[4]arene-crown-5 (1,3- alternate ) and 1,3- alternate -25,27-dihydroxycalix[4]arene-crown-5; aq = aqueous phase, org = organic phase), were evaluated. The stability constants of the NaL +  and CsL +  complexes were calculated from the extraction of the respective picrates in the system of water–nitrobenzene solution of L. Further, the stability constants of the ML +  complexes in nitrobenzene saturated with water were determined. High selectivities were found in some systems under study.

Calix[4]arene-crown-5 as a selective extraction reagents for K + /H + , Rb + /H + and Rb + /Cs + separations