Hexa(1,1,3,3-tetramethyl-butyl)-hexakis(dimethylphosphinoyl-methoxy)-calix[6]arene: Synthesis, characterization and implementation as a synergistic agent in the solvent extraction of lanthanoids
| Autor: | Sabi Varbanov, S. Shenkov, E. Tashev, Tania Tosheva, Ivan Dukov, Victoria Lachkova, Maria Atanassova, Nikolay Vassilev |
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| Rok vydání: | 2017 |
| Předmět: |
Lanthanide
Phosphine oxide Chloroform 010405 organic chemistry Chemistry Inorganic chemistry Nuclear magnetic resonance spectroscopy 010402 general chemistry HEXA 01 natural sciences Medicinal chemistry 0104 chemical sciences Inorganic Chemistry NMR spectra database chemistry.chemical_compound Materials Chemistry Proton NMR Physical and Theoretical Chemistry Conformational isomerism |
| Zdroj: | Polyhedron. 134:135-142 |
| ISSN: | 0277-5387 |
| Popis: | A new lower rim phosphorus-containing calix[6]arene with six dimethyl-methylene phosphine oxide groups, namely 5,11,17,23,29,35-hexa(1,1,3,3-tetramethyl-butyl)-37,38,39,40,41,42-hexakis-(dimethylphosphinoylmethyleneoxy)-calix[6]arene (S), has been synthesized and characterized. The structure of this calix[6]arene was identified and confirmed by elemental analysis, IR, 1H and 31P{H} NMR spectroscopy and ESI-mass-spectrometry. The 1H and 31P{H} NMR spectra indicate that at room temperature in DMSO-d6 and 1,1,2,2-tetrachloroethane-d2 solutions, S exists as a mixture of conformers. The synergistic solvent extraction of selected lanthanoid ions (La, Nd, Eu, Ho, Lu) with 4-benzoyl-3-methyl-1-phenyl-5-pyrazolone (HP) and S in chloroform has been studied. It was found that in the presence of S the lanthanoid ions have been extracted as LnP3·S species. A very large synergistic enhancement (up to 105) was established. The stoichiometry and the structure of the solid complex of Eu(III) with HP and S (1:3:1) were proposed based on elemental analysis, IR, 1H NMR and 31P NMR data. |
| Databáze: | OpenAIRE |
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