Extraction of Lanthanides(III) from Aqueous Nitrate Media with Tetra‐(p‐tolyl)[(o‐Phenylene)Oxymethylene] Diphosphine Dioxide

Abstract

A novel tridentate neutral organophosphorus compound, tetra‐(p‐tolyl)[(o‐phenylene)oxymethylene] diphosphine dioxide (I) has been synthesized and its extracting ability for microquantities of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y from HNO₃ and NH₄NO₃ aqueous solutions has been studied. The effect of HNO₃ concentration in the aqueous phase and that of the extractant concentration in the organic phase on the extraction of metal ions is considered. The stoichiometry of the extracted complexes and conditional extraction constants of Ln(III) have been determined. The extraction behavior of compound I is compared with that of the diglycolamide ligand TODGA. The potentialities of polymeric resin impregnated with compound I for the preconcentration of lanthanides(III) from nitric acid solutions are demonstrated.

Keywords:

• tetra‐(p‐tolyl)[(o‐phenylene)oxymethylene] diphosphine dioxide
• diglycolamide ligands
• lanthanides(III)
• extraction
• solvent impregnated resin

ACKNOWLEDGMENTS

We are grateful to T.A. Orlova and A.E. Lezhnev for their assistance in ICP‐MS measurements; A.N. Pushin and V.I. Shestov for the registration of the ¹H and ³¹P NMR spectra.