A New Class of Hydrophobic Ionic Liquids: Trialkyl(2-methoxyethyl)ammonium Perfluoroethyltrifluoroborate

New hydrophobic ionic liquids consisting of trialkyl(2-methoxyethyl)ammonium ([R1R2R3NCH2CH2OCH3]+, R1, R2, R3 = CH3 or C2H5) cation and perfluoroethyltrifluoroborate ([C2F5BF3]-) anion were prepared by neutralization of aq. [R1R2R3NCH2CH2OCH3][OH] with aq. H[C2F5BF3]. The new [C2F5BF3]--based ionic liquids show much lower melting points and viscosities (58–86 cP at 25 °C), hence higher ionic conductivities, than the [BF4]--based ones.