Volumetric and viscosity properties of binary mixtures containing asymmetrical Gemini ionic liquid

Densities and dynamic viscosities of binary solutions containing asymmetrical Gemini ionic liquid (GIL), 1-(3-(trimethylammonio)prop-1-yl)-3-methylimidazolium bis(dicyanamide) ([N111C3MIM][N(CN)2]2) with acetonitrile (MeCN), methanol (MeOH) or ethanol (EtOH) over the entire mole fraction range have been measured from 293.15 K to 333.15 K under atmospheric pressure. Excess molar volumes (VmE) and excess viscosities (Δη) of the solutions were calculated based on the experimental density and viscosity values of pure [N111C3MIM][N(CN)2]2, molecular solvents, and their binary mixtures. The values of VmE and Δη were fitted by using the Redlich-Kister equations and the optimal fitting parameters were obtained. The results indicate that the values of VmE and Δη reveal negative deviations from ideal solutions. There exists a minimum excess values. Negative values of V_m^E and Δη for all the binary mixtures indicate, compared to pure [N111C3MIM][N(CN)2]2 and molecular solvents, stronger interactions between [N111C3MIM][N(CN)2]2 and MeCN, MeOH or EtOH. These negative values are also related to the difference in size and shape of the molecules studied. Moreover, the variation of VmE and Δη on temperature suggests that temperature has an enormous influence on the intermolecular interactions between [N111C3MIM][N(CN)2]2 and molecular solvents. © All Right Reserved.