Probing the local structure of pure ionic liquid salts with solid- and liquid-state NMR

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DOIResolve DOI: http://doi.org/10.1002/cphc.200900624
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TypeArticle
Journal titleChemPhysChem
ISSN1439-7641
Volume11
Issue1
Pages260268; # of pages: 9
Subjectchemical shifts; computational chemistry; ionic liquids; NMR spectroscopy; solid-state structures
AbstractRoom-temperature ionic liquids (RTILs) are gaining increasing interest and are considered part of the green chemistry paradigm due to their negligible vapour pressure and ease of recycling. Evidence of liquid-state order, observed by IR and Raman spectroscopy, diffraction studies, and simulated by ab initio methods, has been reported in the literature. Here, quadrupolar nuclei are used as NMR probes to extract information about the solid and possible residual order in the liquid state of RTILs. To this end, the anisotropic nature and field dependence of quadrupolar and chemical shift interactions are exploited. Relaxation time measurements and a search for residual second-order quadrupolar coupling were employed to investigate the molecular motions present in the liquid state and infer what kind of order is present. The results obtained indicate that on a timescale of ~10−8 sec or longer, RTILs behave as isotropic liquids without residual order.
Publication date
LanguageEnglish
AffiliationNRC Steacie Institute for Molecular Sciences; National Research Council Canada
Peer reviewedYes
NPARC number17653021
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Record identifierd796c5f7-e6c4-4539-992e-849f8d2c7906
Record created2011-03-31
Record modified2016-05-09
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