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Very Selective Synergistic Extraction of Univalent Cations into Nitrobenzene and Phenyltrifluoromethyl Sulfone Solutions of Dicarbollylcobaltate in the Presence of Some Calix[4]arene-crowns-6

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Abstract

The exchange extraction constants corresponding to the general equilibria M+(aq) + NaL+(org) ⇌ ML+(org) + Na+(aq) and the respective M+(aq) + CsL+(org) ⇌ ML+(org) + Cs+(aq), taking place in the two-phase water–nitrobenzene and water–phenyltrifluoromethyl sulfone (abbrev. FS 13) systems (M+ = Li+, H3O+, Ag+, K+, \({\text{NH}}_{4}^{ + }\), Tl+, Rb+; L = calix[4]arene-bis(t-octylbenzo-18-crown-6), 1,3-alternate-25,27-bis(1-octyloxy)calix[4]arene-crown-6 and 1,3-alternate-25,27-bis(3,7-dimethyloctyl-1-oxy)calix[4]arene-benzocrown-6; aq = aqueous phase, org = organic phase) were evaluated. Stability constants of NaL+ and CsL+ were determined from the extraction of picrates and iodides by the solutions of L. Further, the stability constants of the ML+ complexes in nitrobenzene and FS 13 saturated with water were calculated. Enormously high selectivities were found in the systems under study.

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Acknowledgements

This work was supported by the Grant Agency of Faculty of Environmental Sciences, Czech University of Life Sciences, Prague, Project No.: 42900/1312/3114 “Environmental Aspects of Sustainable Development of Society”, and by the Czech Ministry of Education, Youth, and Sports (Project 20/2015).

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Vaňura, P., Makrlík, E. & Selucký, P. Very Selective Synergistic Extraction of Univalent Cations into Nitrobenzene and Phenyltrifluoromethyl Sulfone Solutions of Dicarbollylcobaltate in the Presence of Some Calix[4]arene-crowns-6. J Solution Chem 49, 1497–1509 (2020). https://doi.org/10.1007/s10953-020-01033-8

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