Al-Hamdani, Uhood J. published the artcileChloro-benzothiazole Schiff base ester liquid crystals: synthesis and mesomorphic investigation, Safety of 6-Chlorobenzothiazol-2-ylamine, the publication is Liquid Crystals, database is CAplus.
Nine new rod-like chlorobenzothiazole based liquid crystals – containing Schiff base and ester linking groups bearing different terminal substituents I [R = H, Cl; R1 = (4-methoxyphenyl), nonyl, (4-octylsulfanylphenyl), etc.] and II [R2 = acetyl, ethoxycarbonyl, [(3,4,5-trimethoxyphenyl)methyleneamino], etc.] were described. Although a few similar chloro substituted benzothiazole compounds were known, none was studied for their liquid crystal properties. All these compounds I and II possess liquid crystal behavior except compds I [R = Cl; R1 = (3,4,5-trimethoxyphenyl)] and II [R2 = [(3,4,5-trimethoxyphenyl)methyleneamino]]. The effect of the nature of the terminal groups on thermal stability and optical properties of the mesomorphic compounds I and II was evaluated. With the exception of compound I [R = H; R1 = (4-octylsulfanylphenyl)] , all the other compounds possess polarity resulting from the polar chloride atom substituted at position-6 of the benzene ring of the benzothiazole moiety which provides a polar group at the one terminal end of the mols. The presence of the fused-ring system (benzothiazole) adds a mol. width that contributes to increase the mol. breadth, causing a thickening effect which disrupts the liquid crystalline packing. New compounds I and II were prepared via reaction of phenolic Schiff bases with the corresponding carboxylic acids or the carboxyl Schiff bases with the corresponding phenols. The synthesized compounds I and II were characterized using 1H- and 13C-NMR and FT-IR spectroscopy, mass spectrometry and elemental anal. Polarised optical microscope and thermal properties were measured to study the thermal and mesophase behaviors.
Liquid Crystals published new progress about 95-24-9. 95-24-9 belongs to thiazole, auxiliary class Organic Pigment, name is 6-Chlorobenzothiazol-2-ylamine, and the molecular formula is C7H5ClN2S, Safety of 6-Chlorobenzothiazol-2-ylamine.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/thiazole,
Thiazole | chemical compound | Britannica