Mesogenic Schiff base esters with benzothiazole core: Synthesis and phase transition studies

Sie Tiong Ha*, Teck Ming Koh, Guan Yeow Yeap, Hong-Cheu Lin, Siew Ling Lee, Yip Foo Win, Siew Teng Ong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A series of new rod-shaped mesomorphic compounds, 6-ethoxy-2-(4- alkanoyloxybenzylidenamino)benzothiazoles, consisting of a 2,6-disubstituted benzothiazole core and a Schiff base central linkage, were synthesized and their structures were ascertained via elemental analysis and spectroscopic techniques. Their mesomorphic properties were studied using differential scanning calorimetry (DSC), polarized optical microscopy (POM) and X-ray diffraction (XRD) analysis. All compounds showed enantiotropic mesomorphism. Whilst the lower members of the series, hexanoyloxy and octanoyloxy derivatives exhibited nematic phase, the higher members (decanoyloxy, dodecanoyloxy, tetradecanoyloxy, hexadecanoyloxy and octadecanoyloxy derivatives) exhibited nematic and smectic C phases.

Original languageEnglish
Pages (from-to)195-204
Number of pages10
JournalPhase Transitions
Volume83
Issue number3
DOIs
StatePublished - 1 Mar 2010

Keywords

  • 6-ethoxy-2-(4-alkanoyloxybenzylidenamino)benzothiazoles
  • Enantiotropic
  • Nematic
  • Schiff bases
  • Smectic C

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