Synthesis and liquid crystalline studies of disc-shaped molecule on azo-bridged benzothiazole-phenyl ethers

Guan Yeow Yeap*, Mursyida Abdul Rahim, Chien Min Lin, Hong-Cheu Lin, Nobuyuki Maeta, Masato M. Ito

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A new series of triphenylene core attached by six peripheral arms containing benzothiazole-azo with terminal ethoxy unit have successfully been synthesized and their liquid crystalline properties were characterized. The members in this series differ by the length of the methylene unit of [sbnd](CH2)n[sbnd], where n, varied following ascending order from 5 to 10. The molecular structure was characterized by elemental (C, H and N) analysis and spectroscopic methods including Fourier Transform Infrared (FT-IR) and Proton Nuclear Magnetic Resonance (1H NMR). The texture and the phase transition temperatures were investigated by using polarizing optical microscopy (POM) and differential scanning calorimetry (DSC). The disc-shape molecule with shorter spacer (n = 5) showed monotropic nematic phase. The higher homologues with n = 8–10 exhibited enantiotropic nematic phase and monotropic smectic C phase. The XRD diffraction studies further confirm the presence of smectic C without any discotic columnar phase.

Original languageEnglish
Pages (from-to)734-740
Number of pages7
JournalJournal of Molecular Liquids
Volume223
DOIs
StatePublished - 1 Nov 2016

Keywords

  • Discotic liquid crystal
  • Nematic phase
  • Phase transition
  • Smectic C phase
  • Triphenylene

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