Synthesis and mesomorphic behaviours of a homologous series of 2-(4-alkyloxybenzylidenamino)benzothiazoles

Kok Leei Foo, Sie Tiong Ha*, Yip Foo Win, Guan Yeow Yeap, Hong-Cheu Lin, S. Sreehari Sastry

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The synthesis and characterisation of a series of new rod-shaped liquid crystal (LC), 2-(4-alkyloxybenzylidenamino)benzothiazoles possessing even number of carbon atoms at the alkyloxy chain (CnH2n + 1O-, n = 2, 4, 6, 8, 10, 12, 14, 16, 18) are reported. The molecular structures of title compounds were elucidated using FTIR and nuclear magnetic resonance spectroscopic techniques. The phase behaviour of these new compounds was characterised and studied by differential scanning calorimetry and polarising optical microscopy. Lower members (n = 2, 4 and 6) did not exhibit mesophase. Octyloxy derivative was monotropic LC. Enantiotropic smectic A phase was observed from n-decyloxy derivatives onward to the last homologous synthesised.

Original languageEnglish
Pages (from-to)1516-1525
Number of pages10
JournalLiquid Crystals
Volume41
Issue number11
DOIs
StatePublished - 2 Nov 2014

Keywords

  • 2-(4-alkyloxybenzylidenamino)benzothiazoles
  • Schiff bases
  • enantiotropic
  • liquid crystals
  • smectic A

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