Physical and Chemical Properties of 1-Butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [Bmim]NTf2 Ionic Liquid

Abstract

Some physical and chemical properties of ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Bmim]NTf₂) were measured and analyzed separately. At 20 ºC, the density of [Bmim]NTf₂ was 1.4682 g cm-3 and the viscosity was 56.0 m Pas. The relationship of viscosity (η) and temperature (t) was η (mPas) = 87.66-1.58 t (ºC). [Bmim]NTf₂ is insoluble in water and most petroleum aromatics solvents but soluble in some molecular solvents. The conductivity was related with temperature, solvent and concentration. The conductivity increased as temperature increase or the concentration increased. [Bmim]NTf₂ had excellent the chemical-stability and thermostability.