Synthesis of A New Series of Benzothiazole Compounds and Study of Their Liquid Crystal Properties

Document Type : Original Article


Koya University, Faculty of Science and Health, Department of Chemistry, Koya KOY45, Kurdistan Region, Iraq.



A series of benzothiazole Schiff bases with different benzyloxy chain lengths (4-alkoxy-benzylidene)-(6-pentyloxy-benzothiazol-2-yl)-amines are synthesized possessing different carbon chains at the alkoxy substituent (O-CnH2n + 1, n = 1 to 6). Synthesized compounds are thoroughly characterized using proton nuclear magnetic resonance (1H-NMR) and Fourier-transform infrared spectroscopy (FT-IR). Differential polarizing optical microscopy (POM) and scanning calorimetry (DSC) are used to investigate the mesomorphic phase behavior of the synthesized Schiff bases. Liquid crystal phases have been observed for each compound within the series (n = 1 to 5). All of the substances show both the N and SmC phases, particularly when n=6, the N phase is not visible, and only the SmC phase is present.


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