title: Highly selective synergism for the extraction of lanthanoid(III) ions with β-diketones and trioctylphosphine oxide in an ionic liquid.
abstract: Selective synergism for the extraction of lanthanoids(III) (Ln) with β-diketones such as 2-thenoyltrifluoroacetone, 2-naphthoyltrifluoroacetone, and benzoylacetone has been investigated in the presence of trioctylphosphine oxide as a hydrophobic neutral ligand in 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide as an ionic liquid. The extractability of heavier Ln was remarkably enhanced, resulting in a significant improvement in the separation of Ln. It was found that the present synergism is ascribed to the formation of cationic ternary complexes, followed by ion exchange into the ionic liquid.
authors.affiliation: Faculty of Chemistry, Institute of Science and Engineering, Kanazawa University.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Okamura
authors.forename: Hitomi
authors.initials: H
authors.lastname: Takagi
authors.forename: Taku
authors.initials: T
authors.lastname: Isomura
authors.forename: Kotaro
authors.initials: K
authors.lastname: Morita
authors.forename: Hirohisa
authors.initials: H
authors.lastname: Nagatani
authors.forename: Hisanori
authors.initials: H
authors.lastname: Imura