Proceedings of International Conference on Applied Innovation in IT
2026/03/31, Volume 14, Issue 1, pp.485-493
Synthesis and Liquid Crystalline Properties of Triazole-Based Azo-Schiff Base Derivatives for Optoelectronic Applications
Haneen J. Atiws, Wassan Baqir Ali and Noor Sabah Al-Obaidi Abstract: A new series of 1,2,4-triazole-based heterocyclic Schiff base derivatives were prepared via a multi-stage synthetic pathway. This pathway begins with the base compound 2-((4-hydroxybenzylidene)amino)acetic acid, which reacts with thiocarbhydrazide to produce the required intermediates. These compounds were subsequently subjected to condensation, isomerization, and structural modification to yield the final derivatives. The chemical structure of the prepared compounds was confirmed using a range of advanced spectroscopic techniques. Fourier transform infrared (FT-IR) spectra revealed the characteristic extensions and vibrations of the imine (–C=N–) and azo (–N=N–) groups. In addition to the signals of the hydroxyl (–OH) and thiol (–SH) groups, both the 1H-NMR and 13C-NMR spectra supported the validity of the proposed structure by showing chemical shifts consistent with the heterocyclic structure and the triazole nucleus. The structural study showed that the molecular shape of 3-phenylthiazolidine-2-one compounds replaced by pentyloxy and octyloxy chains has a spatial distribution and morphological regularity that gives it remarkable mesogenic behavior, indicating the possibility of its use in crystalline liquid material applications or thermally responsive functional materials. According to POM, the birefringent textures and typical upon heating textures patterns of the samples confirm the presence of thermotropic liquid crystalline phases nematic (N) and smectic (SC). The synthesized triazole-based azo-Schiff base derivatives have been found to possess conjugated π-systems and anisotropic molecular order, thus suggesting their potential application in LCD and optoelectronic materials.
Keywords: 1,2,4-Triazole, Schiff Base, Azo Compounds, Liquid Crystals, POM.
DOI: Under indexing
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