Abstract
The nature of species formed in the extraction of Ln(III) (where Ln(III)=La, Gd, Lu) with 5,7-dibromo-8-hydroxyquinoline (5,7(Br)HO x) in CHCl 3 from water phase and La(III) with 5,7-dichloro-8-hydroxyquinoline (5,7(Cl)HO x) in CHCl 3 from water and water–methanol phases was examined. It was stated that during the extraction from water phase the six-coordinated chelates were extracted. In the presence of methanol in the water phase eight-coordinated mixed ligand adducts were observed. The parameters of the extraction process and separation factors of La–Gd, Gd–Lu and La–Lu pairs were calculated.
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