Correlation between hydrocarbon flexibility and physicochemical properties for cyclohexyl-imidazolium based ionic liquids studied by 1H and 13C NMR

► Cyclohexyl-imidazolium based ionic liquids. ► Physical properties of these species were compared with n-alkylimidazolium series. ► Cyclohexyl substituents lead lower fluidity in ionic liquids. ► Temperature dependence of NMR spectra is consistent with macroscopic observations.