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Radiochimica Acta 96 (2008) 1-10
TRLFS and EXAFS investigations of lanthanide and actinide complexation by triflate and perchlorate in an ionic liquid
S. Stumpf1, I. Billard1, C. Gaillard1, P.J. Panak, K. Dardenne

The solvation of the Eu-perchlorate (ClO4–) and triflate (CF3SO3–, OTf–) salts as well as of Cm(ClO4)3 and Am(ClO4)3 in the ionic liquid C4mimTf2N (1-butyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide) has been comparatively investigated by application of laser fluorescence spectroscopy and X-ray absorption spectroscopy. Moreover, the ClO4–/OTf– ligand exchange reaction for the two actinide cations has been analyzed by the same spectroscopic techniques. A structural model for the different complexes was determined by the interpretation of the spectroscopic data. The lanthanide and the two actinide cations show the same coordination in C4mimTf2N. Moreover, a sequence for the strength of complexing ligands could be deduced from the spectroscopic data for the lanthanide and the two actinides: ClO4–>OTf–≥Tf2N–>H2O.
1 :  DRS-IPHC - Département Recherches Subatomiques
Ionic liquids – Lanthanides – Actinides – Eu(III) – Cm(III) – Am (III) – TRLFS – XAFS – Complexation – Luminescence