Abstract
From extraction experiments and γ-activity measurements, the exchange extraction constants corresponding to the general equilibrium C+(aq)+1·Na+(nb)⇔⟺1·C+ (nb)+Na+ (aq) taking place in the two-phase water–nitrobenzene system (C+=protonated α-amino acid methyl ester, 1=benzo-18-crown-6; aq=aqueous phase, nb=nitrobenzene phase) were evaluated. Furthermore, the stability constants of the 1·C+ complex species in nitrobenzene saturated with water were calculated; they were found to increase in the following cation order: protonated l-tryptophan methyl ester<protonated l-phenylalanine methyl ester<protonated l-leucine methyl ester, protonated l-methionine methyl ester<protonated l-valine methyl ester.
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