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E. Makrlík, P. Vanura
Contribution to the Thermodynamics of Complexes of Alkali Metal Cations with Benzo-18-Crown-6 in the Water–Nitrobenzene Extraction System
Keywords: Thermodynamics, Alkali Metal Cations, Crown Compound, Extraction and Stability Constants, Water–Nitrobenzene System
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+, K+, Rb+, Cs+; L = benzo-18-crown-6; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Further, the stability constants of the ML+ complexes in water saturated nitrobenzene were calculated; they were found to increase in the cation order Cs+ < Rb+ < Li+ < Na+ < K+.
Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0942-9352
Volume: 220, 09/2006
Pages: 1125 - 1130