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

Research output: Contribution to journalArticle

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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

Cite this

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

In: Phase Transitions, Vol. 84, No. 1, 2011, p. 29-37.

Research output: Contribution to journalArticle

Yeap, Guan-Yeow ; Lee, Huey-Charn ; Mahmood, Wan Ahmad Kamil ; Imrie, Corrie T. ; Takeuchi, Daisuke ; Osakada, Kohtaro. / 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. In: Phase Transitions. 2011 ; Vol. 84, No. 1. pp. 29-37.
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AU - Lee, Huey-Charn

AU - Mahmood, Wan Ahmad Kamil

AU - Imrie, Corrie T.

AU - Takeuchi, Daisuke

AU - Osakada, Kohtaro

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AB - 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.

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KW - polarizability

KW - molecular size

KW - oligomers

KW - mesogens

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