Synthesis of new schiff base ester liquid crystals with a benzothiazole core

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

A series of new calamitic liquid crystals, 6-methoxy-2-(4-alkanoyloxybenzylidenamino)benzothiazoles, comprising a benzothiazole core, terminal methoxy group and a Schiff base linkage were synthesised and characterised. This series comprises 12 members wherein members differ by the length of the alkanoyloxy chain (Cn-1H2n-1COO-, where n = 2-8, 10, 12, 14, 16, 18). Their mesomorphic properties were studied by using differential scanning calorimetry, optical polarising microscopy and powder X-ray diffraction techniques. The short chain derivatives (n = 2 and 3) were non-mesogenic compounds, while an enantiotropic nematic phase was present throughout the remaining members of the series. The smectic C phase emerged from the decanoyloxy derivative onwards.

Original languageEnglish
Pages (from-to)547-554
Number of pages8
JournalLiquid Crystals
Volume37
Issue number5
DOIs
StatePublished - 1 May 2010

Keywords

  • 6-methoxy-2-(4-alkanoyloxybenzylidenamino)benzothiazole
  • Nematic
  • Schiff bases
  • Smectic C

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