Abstract
Abstract 1,3-Dimethylimidazolium bis(fluorosulfonyl)amide, [C1mim]FSA, is an ionic liquid with a lower viscosity than the bis(trifluoromethanesulfonyl)amide salt, [C1mim]NTf2, but with a higher melting point. The single-crystal X-ray structure analysis reveals that this is because the [C1mim]FSA crystal has low coordination ion number and three types of highly symmetric polydentate C–H···O hydrogen bonds.
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