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Identifying intermolecular multiple-quantum coherences in ionic liquids
Yanan Li1, Florin Teleanu2, Alexej Jerschow1
1Department of Chemistry, New York University, 100 Washington Square East, New York, 10003, NY, United States.
Abstract:
Intermolecular multiple quantum coherences (iMQCs) may arise in isotropic systems with high spin concentrations, of which ionic liquids are an important example. In examining the 1H, 19F, and 11B nuclei of the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]), we identified the existence of homonuclear iMQCs for all these nuclei. In addition, for the 11B quadrupolar nuclei, we investigated the possible excitation of intramolecular triple quantum coherences (TQCs) which could in principle arise from the slow tumbling in ionic liquids. These experiments showed that while iMQCs can be excited for 11B, (intramolecular) triple-quantum coherences were not detectable. These findings may help clarifying the ion dynamics and intermolecular interactions in ionic liquids.
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