Effects of cation and anion on physical properties of room-temperature ionic liquids

To investigate the effects of the cation and anion on the physical properties of room-temperature ionic liquids, the temperature dependences of the viscosity and density of 12 (7 cationic, 6 anionic) room-temperature ionic liquids were measured and analyzed. The effects of the cation were investigated using chainlike and cyclic (aromatic and non-aromatic) nitrogen-based room-temperature ionic liquids, and amide-type (N(SO2CxF2x + 1)2, x = 0, 1, 2) anions and anions of various shapes were used to investigate the effects of the anion.