Complexation of trivalent lanthanoid ions with 4-benzoyl-3-phenyl-5-isoxazolone and p-tert-butylcalix[4]arene fitted with phosphinoyl pendant arms in solution during synergistic solvent extraction and structural study of solid complexes by IR and NMR |
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| Authors: | Maria Atanassova Victoria Lachkova Nikolay Vassilev Sabi Varbanov Ivan Dukov |
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| Institution: | 1. University of Chemical Technology and Metallurgy, Department of General and Inorganic Chemistry, 8 Kliment Ohridski Blvd., BG1756 Sofia, Bulgaria;2. University of Forestry, Department of Ecology, 10 Kliment Ohridski Blvd., BG1756 Sofia, Bulgaria;3. Institute of Organic Chemistry, Bulgarian Academy of Sciences, Block 9, Acad. G. Bonchev Street, BG 1113, Sofia, Bulgaria |
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| Abstract: | The liquid extraction of 14 lanthanoids with a 4-benzoyl-3-phenyl-5-isoxazolone (HPBI) alone in CHCl3 as a diluent from perchlorate medium at constant ionic strength μ = 0.1 is investigated. The synergistic solvent extraction of five selected lanthanoid ions (La3+, Nd3+, Eu3+, Ho3+ and Lu3+) with 4-benzoyl-3-phenyl-5-isoxazolone (HPBI) and 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis-(dimethylphosphinoylmethoxy)calix4]arene, (S) in CHCl3 has been studied too. The stoichiometry of the extracted species was characterised by a classical log–log plot analysis. It was found that the composition of the extracted species with HPBI are Ln(PBI)3 and in the presence of the phosphorus-containing calix4]arene the lanthanoid ions have been extracted as Ln(PBI)3S2]. The values of the equilibrium constants and the separation factors have been calculated. The influence of the synergistic agent on the extraction process has been discussed. |
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| Keywords: | Lanthanoids Phosphorus-containing calix[4]arene 4-Benzoyl-3-phenyl-5-isoxazolone Synergistic solvent extraction Separation factors Solid complexes NMR |
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