Measurement of H/D isotope effects on the 19F resonances of sequentially deuterated 1-n-butyl-3-methylimidazolium hexafluorophosphate and tetrafluoroborate isotopologues reveals the formation of aliphatic C–H⋯X hydrogen bonds between the fluorinated anions and protons along the N-alkyl sidechains of the cations.
A. Khrizman, H. Y. Cheng, G. Bottini and G. Moyna, Chem. Commun., 2015, 51, 3193 DOI: 10.1039/C4CC09783A
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