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Synthesis and phase transition behaviours of new non-symmetric liquid crystal dimers

Seou, Chi-Kien and Ha, Sie-Tiong and Win, Yip-Foo and Lee, Siew Ling and Yeap, Guan-Yeow (2014) Synthesis and phase transition behaviours of new non-symmetric liquid crystal dimers. Liquid Crystals, 41 (11). p. 1634. ISSN 0267-8292

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Official URL: http://dx.doi.org/10.1080/02678292.2014.938373

Abstract

A new series of non-symmetric liquid crystal dimers N-(4-(n-(4-(benzothiazol-2-yl)phenoxy)alkyloxy)-4-nitro-benzylideneimine) containing benzothiazole and benzylideneaniline as the mesogenic core units connected by a flexible alkyl spacer, -(CH2)(n)-, with n ranging from 2 to 6, 8, 10 and 12 have been prepared. Their molecular structures were proposed via spectroscopic techniques. Mesomorphic properties were studied using differential scanning calorimetry and polarising optical microscopy. The results showed that the clearing temperatures decreased upon lengthening of the alkyl spacers. Whilst even member with the shortest alkyl spacer (n=2) exhibited nematic phase, the rest of even members (n=4, 6, 8, 10 and 12) possessed smectic and nematic properties. Nematic phase range gradually decreased from n=2 to n=12. Odd members are belonged to non-mesogenic compounds except for n=5 which exhibited monotropic (metastable) nematic phase.

Item Type:Article
Uncontrolled Keywords:benzylideneaniline, benzothiazole
Subjects:Q Science
Divisions:Science
ID Code:62780
Deposited By: Fazli Masari
Deposited On:14 Jun 2017 08:38
Last Modified:14 Jun 2017 08:38

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