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Phase Transitions
A Multinational Journal
Volume 91, 2018 - Issue 5
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Research Articles

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

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Pages 509-520 | Received 25 Oct 2017, Accepted 08 Jan 2018, Published online: 25 Jan 2018
 

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 (CnH2n+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.

Acknowledgments

The authors would like to thank Universiti Tunku Abdul Rahman for the financial supports and research facilities.

Disclosure statement

No potential conflict of interest was reported by the authors.

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