Complexation of some protonated α-amino acid methyl esters with benzo-18-crown-6 in nitrobenzene saturated with water

Add time:07/24/2019    Source:sciencedirect.com

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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