A comparison study on the properties of 1,3-dialkylimidazolium tetrafluoroborate salts prepared by halogen-free and traditional method

摘要: Abstract A series of 1,3-dialkylimidazolium tetrafluoroborate salts had been prepared via one-step alkylation N-alkylimidazole with trialkyloxonium and traditional two-step method, respectively. The possible impurities in these ionic liquids (ILs) such as Cl−, Br−, Na+ alkyl imidazoles were measured. Detailed characterizations two approaches the ILs properties performances spectroscopic properties, phase behavior, viscosity, refractive index, electrochemical systemically conducted. obtained results showed that variety synthesized methods resulted distinct changes physicochemical for same IL. Therein, comparison behaviors employed emphasized. Furthermore, most cases, by possessed higher lower index well conductivity than one-step. It was worth noting 1-decyl-3-ethylimidazolium ([DEIm]BF4) respectively exhibited distinctly different fluorescence behaviors. reason might be attributed to significant improvement on purities strategy.