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Mesomorphic behaviors of a series of heterocyclic thiophene-imine-ester-based liquid crystals

Foo, K. L. and Ha, S. T. and Yeap, G. Y. and Lee, S. L. (2018) Mesomorphic behaviors of a series of heterocyclic thiophene-imine-ester-based liquid crystals. Phase Transitions, 91 (5). pp. 509-520. ISSN 0141-1594

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Official URL: http://dx.doi.org/10.1080/01411594.2018.1428973

Abstract

The synthesis and characterization of a series of heterocyclic liquid crystal, 4-{[(thiophen-2-yl)methylidene]amino}phenyl 4-alkoxybenzoates possessing even number of carbon atoms at the alkoxy chain (CnH2 n +1O-, n = 6, 8, 10, 12, 14, 16, 18) are reported. The molecular structures of title compounds were elucidated using Fourier-transform infrared spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR) spectroscopic techniques along with mass spectrometric analysis. The phase behavior of these compounds was characterized and studied by differential scanning calorimetry and polarizing optical microscopy. All members exhibited enantiotropic nematic phase except for the highest member (n = 18) which is a non-mesogen. Influence of alkoxy chain length on the transition temperatures of crystal-to-nematic (melting point) and nematic-to-isotropic (clearing point) was studied. Nematic phase range was found to increase from n = 6 to n = 10, then it started to descend from n = 12 to n = 16 and finally the nematic phase disappeared when n changed to 18.

Item Type:Article
Uncontrolled Keywords:enantiotropicheterocyclic
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:85474
Deposited By: Widya Wahid
Deposited On:30 Jun 2020 16:45
Last Modified:30 Jun 2020 16:45

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