Aluminum Bromide‐1‐Methyl‐3‐Ethylimidazolium Bromide Ionic Liquids: I . Densities, Viscosities, Electrical Conductivities, and Phase Transitions

The solid‐liquid phase diagram, experimental glass transition points, densities, viscosities, and electrical conductivities of the aluminum bromide‐1‐methyl‐3‐ethylimidazolium bromide ionic liquid are reported. Certain compositions of this two‐component molten salt are liquid at room temperature. Density, viscosity, and conductivity data were collected over the range of aluminum bromide mole fractions from ca. 0.35 to 0.75 and over the range of temperatures from ca. 25° to 100°C. Equations are presented that describe both the composition and temperature dependence of the densities and transport properties. Both the viscosities and the conductivities display the non‐Arrhenius temperature dependence typically associated with glass forming ionic liquids. Temperature‐dependent activation energies are derived for these transport processes by using the Vogel‐Tammann‐Fulcher equation.