Physicochemical properties and structures of room-temperature ionic liquids. 3. Variation of cationic structures

A series of room-temperature ionic liquids (RTILs) were prepared with different cationic structures, combined with an anion and the thermal property, density, self-diffusion coefficients of the cation and anion, viscosity, ionic conductivity were measured over a wide temperature range. It was found that the relative cationic and anionic self-diffusion coefficients for the RTILs appear to be influenced by the shape of cationic structure and that the microscopic ion dynamics and ionic state significantly contributes to the macroscopic physicochemical properties of the ionic liquids.