Ionic Liquid Crystals Based on Mesitylene-Containing Bis- and Trisimidazolium Salts Auteur(s): Trilla Montserrat, Pleixats Roser, Parella Teodor, Blanc C., Dieudonne-George P., Guari Yannick, Wong Chi Man Michel (Article) Publié: Langmuir, vol. 24 p.259-265 (2008) Texte intégral en Openaccess : Ref HAL: hal-00319583_v1 PMID 18052223 DOI: 10.1021/la702305t WoS: 000251916100039 Exporter : BibTex | endNote 49 Citations Résumé: The synthesis of novel ionic liquid crystals (ILCs) based on bis- and trisimidazolium salts (I-, BF4-, and [N(SO2CF3)2]-) bearing hydrophobic hexadecyl chains and a bridging mesitylene moiety is reported. The study of their mesomorphic properties is presented, including the characterization of the Smectic A phase by differential scanning calorimetry and polarized optical microscopy. A detailed powder X-ray diffraction (p-XRD) study as a function of temperature confirmed that cooling gives rise to a glass transition from the liquid-crystalline smectic A phase to a metastable lamellar phase. In addition, in the case of bisimidazolium iodide, the ability of these molecules to form self-aggregates in solution has been demonstrated by diffusion nuclear magnetic resonance (NMR) experiments. -------------------------------------------------------------------------------- |