Title: Speciation of Rare-Earth Metal Complexes in Ionic Liquids: A Multiple-Technique Approach
Authors: Nockemann, Peter ×
Thijs, Ben
Lunstroot, Kyra
Parac-Vogt, Tatjana
Görller-Walrand, Christiane
Binnemans, Koen
Van Hecke, Kristof
Van Meervelt, Luc
Nikitenko, Sergey
Daniels, John
Hennig, Christoph
Van Deun, Rik #
Issue Date: 2009
Publisher: VCH Verlagsgesellschaft
Series Title: Chemistry - a European Journal vol:15 issue:6 pages:1449-1461
Abstract: The dissolution process of metal complexes in ionic liquids was investigated by a multiple-technique approach to reveal the solvate species of the metal in solution. The task-specific ionic liquid betainium bis(trifluoromethylsulfonyl)imide([Hbet][Tf2N])
is able to dissolve stoichiometric amounts of the oxides of the rare-earth elements. The crystal structures of the
compounds [Eu2(bet)8(H2O)4]Tf2N]6, [Eu2(bet)8(H2O)2][Tf2N]6·2H2O, and [Y2(bet)6(H2O)4][Tf2N]6 were found to
consist of dimers. These rare-earth complexes are well soluble in the ionic liquids [Hbet][Tf2N] and [C4mim][Tf2N] (C4mim = 1-butyl-3-methylimidazolium). The speciation of the metal complexes after dissolution in these ionic liquids was investigated by luminescence spectroscopy, 1H, 13C, and 89Y NMR spectroscopy, and by the synchrotron
techniques EXAFS (extended X-ray absorption fine structure) and HEXS (high-energy X-ray scattering). The combination of these complementary analytical techniques reveals that
the cationic dimers decompose into monomers after dissolution of the complexes in the ionic liquids. Deeper insight into the solution processes of metal compounds is desirable for applications of ionic liquids in the field of
electrochemistry, catalysis, and materials chemistry.
ISSN: 0947-6539
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
Chemistry - miscellaneous
Biochemistry, Molecular and Structural Biology Section
× corresponding author
# (joint) last author

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