Sardon, Siti Nur Fadhilah and Abd Rahman, Nor Mas Mira and Karim, Md. Rabiul and Mat Zahid, Noor Idayu and Mohamad Salleh, Noordini (2021) Effects of lateral methyl and terminal substituents on thermal, mesomorphic and optical properties of azo-ester mesogens. Journal of Molecular Structure, 1225. ISSN 0022-2860, DOI https://doi.org/10.1016/j.molstruc.2020.129112.
Full text not available from this repository.Abstract
Four azo-ester mesogens with lateral methyl were synthesized where these compounds are differed by the terminal substituents i.e. -H, -Cl, -Br and -CN. The compound with-H terminal substituent displayed nematic behavior with narrow mesophase range while electron-withdrawing groups terminated compounds exhibited mesophase behavior with wider nematic range. The presence of lateral methyl group and different terminal substituents used in this study could be utilized to generate anticipated mesophase. Their mesogenic behavior was also compared with previously investigated analogues and other structurally related series to evaluate the effect of lateral methyl group on the mesomorphism. Optical investigations demonstrated that their absorption spectra are identical in shape because of the structural similarities in the mesogenic unit whereas the fluorescence spectra exhibited blue emission and were red-shifted with the incorporation of terminal substituents. The synthesized azo-ester compounds could be potential candidate as fluorescent materials for practical applications such as organic light-emitting diode applications. (c) 2020 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Education, Malaysia (FRGS/1/2016/STG01/UM/02/6) |
| Uncontrolled Keywords: | Azo-ester mesogens; Lateral methyl group; Electron-withdrawing substituent; Liquid crystalline behavior; Optical behavior |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Science |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 07 Apr 2022 06:29 |
| Last Modified: | 07 Apr 2022 06:29 |
| URI: | http://eprints.um.edu.my/id/eprint/27902 |
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