Ionic liquid crystals based on mesitylene-containing bis- and trisimidazolium salts.
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.
Trilla
Montserrat
M
Department of Chemistry and NMR Service, Universitat Autonoma de Barcelona, Cerdanyola del Vallès, Barcelona, Spain.
Pleixats
Roser
R
Parella
Teodor
T
Blanc
Christophe
C
Dieudonné
Philippe
P
Guari
Yannick
Y
Man
Michel Wong Chi
MW