New Homologues Series of Heterocyclic Schiff Base Ester: Synthesis and Characterization

Chong, Y.T. and Sarih, N.M. and Ha, S.T. and Sheikh, M.R.K. (2016) New Homologues Series of Heterocyclic Schiff Base Ester: Synthesis and Characterization. Advances in Physical Chemistry, 2016. pp. 1-7. ISSN 1687-7985, DOI https://doi.org/10.1155/2016/7647695.

Preview

PDF (Full Text) ChongYT_(2016).pdf - Published Version Download (4MB)

Abstract

A homologous series of liquid crystal bearing with heterocyclic thiophene Schiff base ester with alkanoyloxy chain (CH3(CH2)nCOO–, 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, 1H, and 13C 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).

Item Type:	Article
Funders:	Postgraduate Research Fund (PPP). Vote PG013-2013A, Fundamental Research Grant Scheme (FRGS). Vote FP031-2014B
Uncontrolled Keywords:	New Homologues Series; Heterocyclic Schiff Base Ester; Synthesis; Characterization
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science > Department of Chemistry
Depositing User:	Ms. Juhaida Abd Rahim
Date Deposited:	14 Jul 2017 06:01
Last Modified:	14 Jul 2017 06:01
URI:	http://eprints.um.edu.my/id/eprint/17511

Actions (login required)

View Item