The polar domains within model ionic liquids are assessed by intermolecular NOE interaction studies. The cation–cation distances in pure ionic liquids 1-butyl-3-methylimidazolium (see picture) and 1-butyl-2,3-dimethylimidazolium tetrafluoroborate are obtained and used to provide models of the local structure of the liquids.
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Mele et al. (2006) studied this question.
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