Stability Constants of Some Univalent Cation Complexes of 2,3-Naphtho-15-crown-5 in Nitrobenzene Saturated with Water |
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Authors: | E Makrlík P Vaňura P Selucký |
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Institution: | (1) Faculty of Applied Sciences, University of West Bohemia, Husova 11, 306 14 Pilsen, Czech Republic;(2) Institute of Chemical Technology, Technická 5, 166 28 Prague, Czech Republic;(3) Nuclear Research Institute, 250 68 Řež, Czech Republic |
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Abstract: | The extraction of micro amounts of cesium by nitrobenzene solutions of sodium, potassium and rubidium dicarbollylcobaltates
(M+B−;M+=Na+,K+,Rb+) has been investigated in the presence of 2,3-naphtho-15-crown-5 (N15C5, L). The equilibrium data were explained by assuming
that ML+ and ML2+ complexes (M+=Na+,K+,Rb+, Cs+; L=N15C5) were present in the organic phase. The stability constants of the complex species ML+ and ML2+ have been determined in nitrobenzene saturated with water. It was found that the stability of the complex cation ML+ (where M+=Na+,K+,Rb+, Cs+; L=N15C5) in water-saturated nitrobenzene solutions increases along the series Cs+<Rb+<K+<Na+, whereas that of the species ML2+ in the same medium increases in the order Cs+<Rb+<Na+<K+. |
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Keywords: | Univalent cations 2 3-Naphtho-15-crown-5 Stability constants Water– nitrobenzene system Extraction |
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