Mesomorphic, optical, dielectric, and electro-optic properties of azo-ester materials: Effect of lateral methyl and terminal substituents

Kamal, Salwa J. and Salleh, Noordini Mohamad and Mahmud, Habibun Nabi Muhammad Ekramul and Abdullah, Iskandar and Gopal, Sanjeev R. and Velayutham, Thamil Selvi and Zahid, Noor Idayu Mat (2021) Mesomorphic, optical, dielectric, and electro-optic properties of azo-ester materials: Effect of lateral methyl and terminal substituents. Journal of Molecular Liquids, 336. ISSN 0167-7322, DOI

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The effect of introducing a lateral methyl substituent and the two different alkoxy terminal groups on the mesophase behavior of three-benzene-ring molecular core of azo-ester compounds bearing 2-methylbutoxy unit on the opposite terminal side (C1-C6) were explored. Their structures were confirmed by several spectroscopic techniques (Fourier transform infrared spectroscopy, H-1 and C-13 nuclear magnetic resonance spectroscopy). The mesomorphic properties of these compounds were studied by differential scanning calorimetry, polarized optical microscopy, and small- and wide-angle X-ray scattering. Except for the un-substituted terminals (C1 and C4), all other derivatives are liquid crystalline, exhibiting enantiotropic nematic liquid crystal phase. The alteration of the alkoxy chain length from methoxy to butoxy at the phenyl ester terminal group (ring A) for each set of laterally-neat and laterally methyl-substituted mesogens decreases the nematic temperature range. A decrease in the mesophase temperature range is also observed when a lateral methyl substituent is incorporated into phenylazo ring of the mesogenic core (ring C). Optical study demonstrated that their absorption spectra are identical in shape due to the structural similarities of the mesogenic core. The corresponding fluorescence spectra exhibited blue-emission with the laterally methyl substituted compounds having a relatively higher fluorescence intensity compared to that of its laterally un-substituted analogues. Furthermore, the laterally methyl-substituted derivatives were subjected to the planar alignment and their dielectric and electro-optic properties were investigated. The nematic phase of the aligned samples shows antiferroelectric switching behavior with spontaneous polarization, P-s similar to 5 mu C/cm(2). (C) 2021 Elsevier B.V. All rights reserved.

Item Type: Article
Funders: University of Malaya Research University Grant-Faculty Program[GPF060B-2018], SATU Grant[ST001-2020], Imam Abdulrahman Bin Faisal University, Saudi Arabian Cultural Mission
Uncontrolled Keywords: Azo-ester;Lateral methyl substitution;Terminal group;Mesomorphic behavior;Dielectric properties;Electro-optic properties
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science
Depositing User: Ms Zaharah Ramly
Date Deposited: 22 Aug 2022 03:08
Last Modified: 22 Aug 2022 03:08

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