Room-Temperature Ionic Liquids with High Conductivities and Wide Electrochemical Windows

Room-temperature ionic liquids (RTILs), N -alkyl- N -methylpyrrolidinium and N -alkyl- N -methylpiperidinium fluorohydrogenates formulated by and propyl, and butyl), have been synthesized by the reactions of the corresponding chlorides and anhydrous hydrogen fluoride. These RTILs exhibit relatively low viscosities (11.5-34.4 cP), high conductivities (12.3-74.6 mS cm −1 ), and wide electrochemical widows around 5 V using glassy carbon electrodes. The fluorohydrogenate salts of symmetric cations, N , N -dimethylpyrrolidinium and N , N -dimethylpiperidinium obtained by evacuation at room temperature are solids, exhibiting the composition of DMPyrF-2HF and DMPipF-2HF.