Density, Viscosity, Electrical Conductivity, and Surface Tension of Chelate-Based Ionic Liquids [C(10)mim][M(hfac)(3)] (M = Co, Ni, Cu) at Different Temperatures

摘要

Densities, viscosities, electrical conductivities, surface tensions, and melting points of chelate-based ionic liquids [C(10)mim] [M(hfac)(3)] (M = Co-II, Ni-II, Cu-II; hfac = hexafluoroacetylacetonate; C(10)mim = imidazolium cation with C-10 chain) were measured. Densities and viscosities were measured in the temperature range (328.15-343.15) K, and electrical conductivities and surface tensions were measured in the temperature range (323.15-343.15) K. By means of Glasser's theory, the standard molar entropy and crystal energy were estimated. The molar enthalpy of vaporization was calculated by Kabo's method, and the ionicity was evaluated by the Walden rule. The effects of different metals on the properties of ionic liquids were compared, and it was found that different metals have great influence on the transport properties of ionic liquids but little influence on thermodynamic properties.