SOLVENT EXTRACTION OF THE RARE-EARTH METAL IONS BY A CONE-SHAPED CALDC[4]ARENE SUBSTITUTED AT THE LOWER RTM BY FOUR -CH2P(O)Ph2 LIGANDS |
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| Authors: | MR Yaftian M Burgard D Matt CB Dieleman F Rastegar |
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| Affiliation: | 1. Laboratoire de Chimie Minerale et Analytique U.R.A Ecoie Europeenne de Chimie, Polymeres et Materiaux (ECPM), Universite Louis Pasteur , 405 du C.N.R.S 1, rue Blaise Pascal Cedex, Strasbourg, 67008, France;2. Groupe de Chimie inorganique Moleculaire, U.RA Ecoie Europeenne de Chimie, Polymeres et Materiaux (ECPM), Universite Louis Pasteur , 416 du C.N.R.S 1, rue Blaise Pascal Cedex, Strasbourg, 67008, France |
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| Abstract: | ABSTRACT The extraction properties of cone-5,11,17,23-tetra-t-butyl-25,26,27,28-tetrakis(diphenylphosphinoylmethoxy)calix4]arene (1) in 1,2-dichloroethane towards rare-earth metal ions at 25 °C have been investigated. The slope analysis showed a 1:1 metal/ligand ratio for the extracted species (La, Eu, Er and Y). The distribution coefficients increase with the polarity of the diluents : chloroform ≤ dichioromethane ≤ 1,2-dichloroethane ≤ nitrobenzene. In the competitive extraction of 11 rare-earth metal ions (La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb and Y), ligand 1 exhibits higher extraction efficiency and a better separation factor than tri-n-octylphosphine oxide. |
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| Keywords: | calix[4]arene phosphine oxide rare earths solvent extraction |
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