| Summary: | In this work, the ionic liquids 1-ethyl-1-methylpyrrolidinium ethylsulfate [EMpyr][ESO4], 1-n-butyl-1- ethylpyrrolidinium ethylsulfate [BEpyr][ESO4], 1-n-butyl-1-methylpyrrolidium methylsulfate [BMpyr][MSO4], and triethylmethylammonium methylsulfate [E3MN][MSO4] were synthesized, and their experimental densities, speeds of sound, dynamic viscosities, and refractive indices were studied as a function of temperature at atmospheric pressure. Thermal expansion coefficient, molar volume, and molar refraction of these ionic liquids were calculated from the experimental density and refractive index values. A thermal analysis for pyrrolidinium and ammonium-based ionic liquids at temperatures between T ) (253.15 and 363.15) K is presented.
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