The Structure of a Room-Temperature Ionic Liquid with and without Trace Amounts of Water: The Role of C[BOND]H⋅⋅⋅O and C[BOND]H⋅⋅⋅F Interactions in 1-n-Butyl-3-Methylimidazolium Tetrafluoroborate


  • We wish to thank Mr. Walter Panzeri (CNR-ICRM) for technical assistance, Prof. Enzio Ragg (University of Milano) and Dr. Giovanni Fronza (CNR-ICRM) for stimulating discussions.


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Solvated solvents: Water molecules interact with the imidazolium cation and [BF4] ion (see picture) of the molten ionic-liquid salt 1-n-butyl-3-methylimidazolium tetrafluoroborate. Evidence for short C[BOND]H⋅⋅⋅O and C[BOND]H⋅⋅⋅F interactions is provided by 1H{1H} and 1H{19F} NMR spectroscopy nuclear Overhauser enhancements.