Low-Viscous, Low-Melting, Hydrophobic Ionic Liquids: 1-Alkyl-3-methylimidazolium Trifluoromethyltrifluoroborate

New hydrophobic ionic liquids, 1-alkyl-3-methylimidazolium (alkyl = methyl, ethyl, n-propyl, n-butyl, n-hexyl) trifluoromethyltrifluoroborate ([CF3BF3]-), have been synthesized by a metathesis reaction between 1-alkyl-3methylimidazolium halide and K[CF3BF3]. All these new ionic liquids exhibit low viscosities (26–77 cP at 25 °C) and low melting points, resulting in high conductivities correspondingly.