Abstract
From extraction experiments and γ-activity measurements, the extraction constants corresponding to the general equilibrium Eu3+(aq) + 3 A−(nb) + L(nb) ⇔ EuL3+(nb) + A−(nb) taking place in the two-phase water–nitrobenzene system (\( {\text{A}}^{ - } = {\text{CF}}_{3} {\text{SO}}_{3}^{ - } \); L = tetrakis(2-ethoxyethoxy)-tetra-p-tert-butylcalix[4]arene (1), tetraethyl p-tert-butylcalix[4]arene tetraacetate (2), p-tert-butylcalix[4]arene-tetrakis(N,N-diethylacetamide) (3), hexaethyl p-tert-butylcalix[6]arene hexaacetate (4), p-tert-butylcalix[6]arene-hexakis(N,N-diethylacetamide) (5); aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Further, the stability constants of the EuL3+ complexes in nitrobenzene saturated with water were calculated; they were found to increase in the series of 2 < 4 < 1 < 5 < 3.
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The present work was supported by the Czech Ministry of Education, Youth and Sports, Projects MSM 4977751303 and MSM 6046137307.
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Makrlík, E., Budka, J., Vaňura, P. et al. Extraction of europium trifluoromethanesulfonate into nitrobenzene in the presence of some electroneutral calixarene ligands. J Radioanal Nucl Chem 283, 193–196 (2010). https://doi.org/10.1007/s10967-009-0205-5
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DOI: https://doi.org/10.1007/s10967-009-0205-5