Complexation of some univalent organic cations with benzo-18-crown-6 in nitrobenzene saturated with water |
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Authors: | Emanuel Makrlík Petr Vaňura Pavel Selucký |
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Institution: | 1.Faculty of Environmental Sciences,Czech University of Life Sciences,Prague 6,Czech Republic;2.Department of Analytical Chemistry,Institute of Chemical Technology,Prague 6,Czech Republic;3.Nuclear Research Institute,?e?,Czech Republic |
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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+ = methylammonium, ethylammonium, propylammonium, ethanolammonium, diethanolammonium, triethanolammonium, cation TRIS+, hydrazinium, hydroxylammonium; 1 = benzo-18-crown-6; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Furthermore, the stability constants of the 1·C+ cationic complex species in nitrobenzene saturated with water were calculated; they were found to increase in the following cation order: triethanolammonium < propylammonium < ethylammonium, diethanolammonium < methylammonium < ethanolammonium < cation TRIS+ < hydrazinium < hydroxylammonium. ![MediaObjects/11532_2012_52_Fig1_HTML.jpg](/content/D269307056004404/MediaObjects/11532_2012_52_Fig1_HTML.jpg) |
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