Highly efficient separation of actinides from lanthanides by a phenanthroline-derived bis-triazine ligand

Frank Lewis, Laurence Harwood, Michael Hudson, Michael Drew, Jean Desreux, Geoffrey Vidick, Nouri Bouslimani, Giuseppe Modolo, Andreas Wilden, Michal Sypula, Trong Vu, Jean Simonin

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232 Citations (Scopus)
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Abstract

The synthesis, lanthanide complexation and solvent extraction of actinide(III) and lanthanide(III) radiotracers from nitric acid solutions by a phenanthroline-derived quadridentate bis-triazine ligand is described. The ligand separates Am(III) and Cm(III) from the lanthanides with remarkably high efficiency, high selectivity and fast extraction kinetics compared to its 2,2’-bipyridine counterpart. Structures of the 1:2 bis complexes of the ligand with Eu(III) and Yb(III) were elucidated by X-ray crystallography and force field calculations, respectively. The Eu(III) bis-complex is the first 1:2 bis-complex of a quadridentate bis-triazine ligand to be characterized by crystallography. The faster rates of extraction were verified by kinetics measurements using the rotating membrane cell technique in several diluents. The improved kinetics of metal ion extraction are related to the higher surface activity of the ligand at the phase interface. The improvement in the ligands properties on replacing the bipyridine unit with a phenanthroline unit far exceeds what was anticipated based on ligand design alone.
Original languageEnglish
Pages (from-to)13093-13102
JournalJournal of the American Chemical Society
Volume133
Issue number33
DOIs
Publication statusPublished - 2011

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