Stability Constants of Some Univalent Cation Complexes of Tetra-tert-butyl p-tert-Butylcalix[4]arene Tetraacetate in Nitrobenzene Saturated with Water

摘要

From extraction experiments and y-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~+ NH~+ As~+ K~+Rb~+ Tl~+ Cs~+; L = tetra-tert-butyl p-tert-butylcalix[4]arene tetraacetate; aq = aqueous phase, nb = nitrobenzeneVse) were evaluated. Further, the stability constants ofthe ML~+ complexes in water saturated nitrobenzene were calculated; they were found to increase in the series Cs~+< Rb~+ < Ti~+ < K~+ < NH_4~+ < Ag~+ < Li~+ .