Synthesis, thermal and optical behaviour of non-symmetric liquid crystal dimers alpha-(4-benzylidene-substituted-aniline-4 '-oxy)-omega-[pentyl-4-(4 '-phenyl)benzoateoxy]hexane

Guan-Yeow Yeap, Huey-Charn Lee, Wan Ahmad Kamil Mahmood, Corrie T. Imrie, Daisuke Takeuchi, Kohtaro Osakada

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Abstract

A series of six non-symmetric liquid crystal dimers -(4-benzylidene-substituted-aniline-4'-oxy)--[pentyl-4-(4'-phenyl)benzoateoxy]hexane have been synthesized and characterized. These dimers vary from one another in terms of the terminal substituent (H, CH3, C2H5, F, Cl and Br) with different polarizabilities and molecular sizes. Investigation on the thermal behaviour shows that the dimer with a more polarizable terminal substituent of Br atom exhibits a smectic A phase as well as an enantiotropic nematic phase. Influence of the molecular size of the terminal substituent in stabilizing the liquid crystalline properties is also studied.

Original languageEnglish
Pages (from-to)29-37
Number of pages9
JournalPhase Transitions
Volume84
Issue number1
DOIs
Publication statusPublished - 2011

Keywords

  • non-symmetric
  • dimer
  • terminal substituent
  • polarizability
  • molecular size
  • oligomers
  • mesogens
  • core

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