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Speciation of rare-earth metal complexes in ionic liquids : a multiple-technique approach

(2009) CHEMISTRY-A EUROPEAN JOURNAL. 15(6). p.1449-1461
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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 [Eu-2(bet)(8)(H2O)(4)][Tf2N](6), [Eu-2(bet)(8)(H2O)(2)][Tf2N](6)center dot 2H(2)O, and [Y-2(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 [C(4)mim]-[Tf2N] (C(4)mim = 1-butyl-3-methylimidazolium). The speciation of the metal complexes after dissolution in these ionic liquids was investigated by luminescence spectroscopy, H-1, C-13, and Y-89 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.
Keywords
EXAFS spectroscopy, MOLECULAR-DYNAMICS, ionic liquids, rare earths, HEXS (high-energy X-ray scattering), UV/Vis spectroscopy, ABSORPTION FINE-STRUCTURE, X-RAY-SCATTERING, TEMPERATURE MOLTEN-SALTS, LANTHANIDE COMPLEXES, NEAR-INFRARED LUMINESCENCE, COORDINATION ENVIRONMENTS, INORGANIC MATERIALS, AQUEOUS-SOLUTION, ACTINIDE SPECIATION

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MLA
Nockemann, Peter, et al. “Speciation of Rare-Earth Metal Complexes in Ionic Liquids : A Multiple-Technique Approach.” CHEMISTRY-A EUROPEAN JOURNAL, vol. 15, no. 6, 2009, pp. 1449–61.
APA
Nockemann, P., Thijs, B., Lunstroot, K., Parac-Vogt, T. N., Gorller-Walrand, C., Binnemans, K., … Van Deun, R. (2009). Speciation of rare-earth metal complexes in ionic liquids : a multiple-technique approach. CHEMISTRY-A EUROPEAN JOURNAL, 15(6), 1449–1461.
Chicago author-date
Nockemann, Peter, Ben Thijs, Kyra Lunstroot, Tatjana N Parac-Vogt, Christiane Gorller-Walrand, Koen Binnemans, Kristof Van Hecke, et al. 2009. “Speciation of Rare-Earth Metal Complexes in Ionic Liquids : A Multiple-Technique Approach.” CHEMISTRY-A EUROPEAN JOURNAL 15 (6): 1449–61.
Chicago author-date (all authors)
Nockemann, Peter, Ben Thijs, Kyra Lunstroot, Tatjana N Parac-Vogt, Christiane Gorller-Walrand, Koen Binnemans, Kristof Van Hecke, Luc Van Meervelt, Sergey Nikitenko, John Daniels, Christoph Hennig, and Rik Van Deun. 2009. “Speciation of Rare-Earth Metal Complexes in Ionic Liquids : A Multiple-Technique Approach.” CHEMISTRY-A EUROPEAN JOURNAL 15 (6): 1449–1461.
Vancouver
1.
Nockemann P, Thijs B, Lunstroot K, Parac-Vogt TN, Gorller-Walrand C, Binnemans K, et al. Speciation of rare-earth metal complexes in ionic liquids : a multiple-technique approach. CHEMISTRY-A EUROPEAN JOURNAL. 2009;15(6):1449–61.
IEEE
[1]
P. Nockemann et al., “Speciation of rare-earth metal complexes in ionic liquids : a multiple-technique approach,” CHEMISTRY-A EUROPEAN JOURNAL, vol. 15, no. 6, pp. 1449–1461, 2009.
@article{955901,
  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 [Eu-2(bet)(8)(H2O)(4)][Tf2N](6), [Eu-2(bet)(8)(H2O)(2)][Tf2N](6)center dot 2H(2)O, and [Y-2(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 [C(4)mim]-[Tf2N] (C(4)mim = 1-butyl-3-methylimidazolium). The speciation of the metal complexes after dissolution in these ionic liquids was investigated by luminescence spectroscopy, H-1, C-13, and Y-89 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.},
  author       = {Nockemann, Peter and Thijs, Ben and Lunstroot, Kyra and Parac-Vogt, Tatjana N and Gorller-Walrand, Christiane and Binnemans, Koen and Van Hecke, Kristof and Van Meervelt, Luc and Nikitenko, Sergey and Daniels, John and Hennig, Christoph and Van Deun, Rik},
  issn         = {0947-6539},
  journal      = {CHEMISTRY-A EUROPEAN JOURNAL},
  keywords     = {EXAFS spectroscopy,MOLECULAR-DYNAMICS,ionic liquids,rare earths,HEXS (high-energy X-ray scattering),UV/Vis spectroscopy,ABSORPTION FINE-STRUCTURE,X-RAY-SCATTERING,TEMPERATURE MOLTEN-SALTS,LANTHANIDE COMPLEXES,NEAR-INFRARED LUMINESCENCE,COORDINATION ENVIRONMENTS,INORGANIC MATERIALS,AQUEOUS-SOLUTION,ACTINIDE SPECIATION},
  language     = {eng},
  number       = {6},
  pages        = {1449--1461},
  title        = {Speciation of rare-earth metal complexes in ionic liquids : a multiple-technique approach},
  url          = {http://dx.doi.org/10.1002/chem.200801418},
  volume       = {15},
  year         = {2009},
}

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