X-Ray absorption spectroscopy investigation of 1-alkyl-3-methylimidazolium bromide salts
- Dipartimento di Chimica, Universita di Roma ''La Sapienza'', P. le A. Moro 5, 00185 Roma (Italy)
- Sincrotrone Trieste S.C.p.A s.s. 14, km 163.5, I-34149 Basovizza, Trieste (Italy)
- Institut Neel, Departement MCMF, 25 Avenue des Martyrs, 38042 Grenoble and FAME beamline at ESRF, 38043 Grenoble (France)
- CASPUR, Inter-University Consortium for Supercomputing in Research, via dei Tizii 6b, 00185 Roma (Italy)
X-ray absorption spectroscopy (XAS) has been used to unveil the bromide ion local coordination structure in 1-alkyl-3-methylimidazolium bromide [C{sub n}mim]Br ionic liquids (ILs) with different alkyl chains. The XAS spectrum of 1-ethyl-3-methylimidazolium bromide has been found to be different from those of the other members of the series, from the butyl to the decyl derivatives, that have all identical XAS spectra. This result indicates that starting from 1-buthyl-3-methylimidazolium bromide the local molecular arrangement around the bromide anion is the same independently from the length of the alkyl chain, and that the imidazolium head groups in the liquid ILs with long alkyl chains assume locally the same orientation as in the [C{sub 4}mim]Br crystal. With this study we show that the XAS technique is an effective direct tool for unveiling the local structural arrangements around selected atoms in ILs.
- OSTI ID:
- 22038672
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 7 Vol. 135; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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