Journal
PHASE TRANSITIONS
Volume 84, Issue 1, Pages 29-37Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01411594.2010.513613
Keywords
non-symmetric; dimer; terminal substituent; polarizability; molecular size
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Funding
- Ministry of Science, Technology and Innovation (MOSTI), Malaysia
- Universiti Sains Malaysia [03-01-05-SF0366 (305/PKIMIA/613328)]
- Research University [1001/PKIMIA/811127]
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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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