Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

In this research synthesis, purification and characterization of six long-chain imidazolium-based ionic liquids (ILs) including C10, C12 and C14 alkyl chain with Chloride and NTf2 anions was investigated. All of these studied ILs were characterized using NMR, CHNSO and DSC and some of impurities such as water, chloride and metal contents were reported. The temperature dependence of some physicochemical properties such as density, dynamic and kinematic viscosity, refractive index, surface tension and thermal stability of the synthesized ILs were also studied in the range of 283.15 to 363.15 K and the results were compared with those from literature. Moreover, using the measured data, thermal expansion coefficient and molar polarizability of the ILs was calculated. On the other hand the effect of alkyl chain length and anion was explained. The results revealed that although the refractive indices and viscosities increased as alkyl chain length increases but the density and surface tension results were reciprocally decreased. Besides, the results suggest that the synthesized ILs were the best choice as fuel additives.