Novel benzene-bridged triphenylene-based discotic dyads.

摘要: We report the synthesis and characterization of two series novel triphenylene-based benzene-bridged symmetric discotic dimers. Two triphenylene discotics have been connected to a rigid benzene ring via flexible methylene spacers. In one series, moiety was tethered with an ester linkage, while in second it is ether linkage. Within each orientation linkage core around has changed by substituting at o-, m-, p-positions. These materials characterized from their spectral elemental analysis. The thermotropic liquid crystalline properties were investigated polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction studies. All virgin compounds do not display any mesomorphism; however, charge transfer complexes trinitrofluorenone, electron acceptor, exhibited columnar mesophases. direct current (dc) conductivity ratios studied variable temperature. small value demonstrates that long spacers as well connectivity dilute column packing, hence making π-π interaction less efficient for entire length. A hexagonal assembly triphenylene-benzene dimer 12 on highly oriented pyrolytic graphite (HOPG) surface visualized tunneling microscopy (STM).