Synthetic ionic liquids and conductivity in organic solvents

Objective To explore the synthetic ionic liquids whether or not can enrich the ester compounds in indoor air.Methods The ionic liquids 1-methyl acetate-3-methylimidazolium bis(trifluoromethanesulfonyl) imide([CH2 COOCH3 MIM] NTf2) and 1-(4-methyl methyl benzoate)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide([CH2 C6 H4 COOCH3 MIM] NTf2) were synthesized by a two-steps method.Their structures were characterized and analyzed by IR,HNMR and MS spectroscopy.And the conductivity in various solvents including DMSO and ethyl acetate was studied at different concentrations and temperatures.Results The spectrum analysis showed that the ionic liquids were qualified.The conductivity of ionic liquids in different solvents increased as the concentration and temperature increased.The conductivity of ionic liquids in DMSO was higher than that in ethyl acetate.The ionic liquid [CH2 COOCH3 MIM]NTf2 had higher conductivity than [CH2 C6 H4 COOCH3 MIM]NTf2 in the same condition.Conclusion The synthetic ionic liquids have stronger interaction with ester solvents,so they are suitable for enriching the ester materials.