Cover Picture: From Short-Range to Long-Range Intermolecular NOEs in Ionic Liquids: Frequency Does Matter (Angew. Chem. Int. Ed. 35/2013)



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The nuclear Overhauser effect … … (NOE) is used for studying the local structures in ionic liquids. In their Communication on page 9242 ff., H. Weingärtner et al. report a new model theory that makes it possible to analyze intermolecular 1H-19F NOE data of 1-butyl-3-methylimidazolium tetrafluoroborate. The arrow in the picture indicates that a H-F NOE at a H–F distance of about 20 Å can be predicted, although it is common knowledge that this effect is only observed for a distance of 5 Å.