Effect of p-tert-Butylcalix[4]arene Fitted with Phosphinoyl Pendant Arms as Synergistic Agent in the Solvent Extraction and Separation of Some Trivalent Lanthanoids with 4-Benzoyl-3-methyl-1-phenyl-5-pyrazolone |
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Authors: | Maria Atanassova Victoria Lachkova Nikolay Vassilev Sabi Varbanov Ivan Dukov |
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Affiliation: | (1) Department of General and Inorganic Chemistry, University of Chemical Technology and Metallurgy, 8 Kliment Okhridski blvd., BG-1756 Sofia, Bulgaria;(2) Department of Ecology, University of Forestry, 10 Kliment Okhridski blvd., BG-1756 Sofia, Bulgaria;(3) Institute of Organic Chemistry, Bulgarian Academy of Sciences, Block 9, P. Bonchev Street, BG 1113 Sofia, Bulgaria |
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Abstract: | The synergistic solvent extraction of five selected lanthanoid ions (La3+, Nd3+, Eu3+, Ho3+ and Lu3+) with a 4-benzoyl-3-methyl-1-phenyl-5-pyrazolone(HP) and the 5,11,17,23-tert-butyl-25,26,27,28-tetrakis(dimethylphosphinoylmethoxy)calix[4]arene, (S) in CHCl3 has been studied. It was found that in presence of this phosphorus-containing calix[4]arene the lanthanoids have been extracted as LnP3 · S. On the basis of the experimental data, the values of the equilibrium constants have been calculated. The influence of the synergistic agent on the extraction process has been discussed. A synergistic effect of almost three orders of magnitude occurs in the extraction of Ln(III) with mixture of HP and S. The values of the separation factors (S.F.) between the adjacent elements have been evaluated. On the basis of the IR and NMR spectra the stoichiometry and the structure of the solid complexes of Eu(III) with HP and Eu(III) with HP and S were proposed. |
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Keywords: | 4-benzoyl-3-methyl-1-phenyl-5-pyrazolone lanthanoids separation factors phosphorus-containing calix[4]arene synergistic solvent extraction |
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