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Advances in Physical Chemistry - Volume 2016 2016, Article ID 7647695, 7 pages -

Research Article

Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia

Department of Chemical Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia

Department of Applied Chemistry and Chemical Engineering, University of Rajshahi, Rajshahi 6205, Bangladesh

Received 28 July 2016; Revised 19 October 2016; Accepted 10 November 2016

Academic Editor: Jan Skov Pedersen

Copyright © 2016 Yee-Ting Chong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A homologous series of liquid crystal bearing with heterocyclic thiophene Schiff base ester with alkanoyloxy chain CH3CH2nCOO–, where , 6, 8, 10, 12, 14, 16 was successfully synthesized through the modification of some reported methods. The structural information of these compounds was isolated and characterized through some spectroscopic techniques, such as FTIR,

H, and

C NMR and elemental analysis. Textural observation was carried out using a polarizing optical microscope POM over heating and cooling cycles. It was found that all synthesized compounds 3a–g exhibited an enantiotropic nematic phase upon the heating and cooling cycle with high thermal stability. Moreover, a characteristic bar transition texture was observed for compounds 3f and 3g which have shown transition of nematic-to-smectic C phase. This has been further confirmed by obtaining relative phase transition temperature using the differential scanning calorimetry DSC.





Autor: Yee-Ting Chong, Norazilawati Muhamad Sarih, Sie-Tiong Ha, and Md. Rezaul Karim Sheikh

Fuente: https://www.hindawi.com/



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