Effect of Methyl Groups onto Imidazolium Cation Ring on Liquid Crystallinity and Ionic Conductivity of Amphiphilic Ionic Liquids

Phase transition behavior of imidazolium dodecylsulfonate was considerably affected by the introduction of methyl groups onto the imidazolium cation ring. Methyl group on the 2-position eliminated the liquid crystallinity. That on the 4-position was effective to suppress the crystallization.