Phosphoryl Podands Ph2P(O)CH2O(CH2CH2O)nCH2P(O)Ph2 (Ln, n = 0–5): Complexation and Extraction of Rare Earth Elements. Crystal Structures of [Ln2L03(NO3)6] · xH2O (Ln = Nd, x = 1.99; Ln = Eu, x = 1; Ln = Er, x = 6.5; Ln = Lu, x = 6) and [LnL2(NO3)3(H2O)] (Ln = Nd, Er)

Abstract

Extraction of rare earth elements with bis(diphenylphosphorylmethyl) ethers of oligoethylene glycols Ph₂P(O)CH₂O(CH₂CH₂O)_nCH₂P(O)Ph₂ (Lⁿ, n = 0–5) in 1,1,7-trihydrododecafluoroheptanol–water system with variable HNO₃ concentration from 0.5 to 6 mol/L has been studied Complexes of Nd, Eu, Lu, and Er nitrates with L⁰ and L² have been obtained. Crystal structures of [Ln₂L₃⁰(NO₃)₆] · xH₂O (Ln = Nd, x = 1.99; Ln = Eu, x = 1; Ln = Er, x = 6.5; Ln = Lu, x = 6) and [LnL₂(NO₃)₃(H₂O)] (Ln = Nd, Er) have been studied by X-ray diffraction, IR spectroscopy, and thermogravimetry. Correlation between X-ray diffraction and extraction data has been revealed.