Mesomorphic and ion conducting properties of dialkyl(1,4-phenylene)diimidazolium salts

Abstract

A new family of dialkyl(1,4-phenylene)diimidazolium salts has been synthesized. Salts containing triflate and bis(trifluoromethanesulfonyl)imide anions and different alkyl chains have been prepared. The molecular structures of didodecyl(1,4-phenylene)diimidazolium triflate and bis(trifluoromethylsulfonyl)imide salts were determined by single crystal X-ray diffraction, and the mesomorphic and ionic conducting properties of all these compounds were investigated and are reported here.

Cholesteryl-containing ionic liquid crystals composed of alkylimidazolium cations and different anions

“…In comparison with the imidazolium chloride salts, the imidazolium tetrachloroaluminates presented a higher conductivity increase both in mesophase and in isotropic phase due to stronger interaction among AlCl 4 À and imidazolium cations, although very little difference in conductivity was observed in the imidazolium-based salts with the same anions. This result is similar to the conductivity in normal imidazolium-based ionic liquids [49].…”

Di‐ and Tricationic Organic Salts: An Overview of Their Properties and Applications

“…Bromide salts decomposed before melting; [CF 3 SO 3 – ] salts exhibited two phase transitions, with the second transition (temperatures over 100 °C) giving a SmC mesophase. The [NTf 2 – ] salts presented different mesomorphic properties: the mesophase had a wider temperature range, with smectic transition (classified as SmT) occurring at around 50 °C, which allowed these salts to be described as ionic liquid crystals 82…”

The liquid crystal state: An intermediate state to obtain crystal packing

“…These Hbonds induce structural directionality contrary to classical salts in which the cohesion is mainly due to ionic bonds (Fig. 1a) [25][26][27][28][29][30][31][32][33][34][35][36][37]. Moreover, complementary electrostatic, π-stacking and van der Waals interactions can also occur in these salts (Fig.…”