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A calamitic symmetric liquid crystalline consisting of an azo group containing 5H-Thiazolo[3,4-b][1,3,4]thiadiazole
moiety compound[III] was synthesized via sequence reactions starting from reaction terephthaldehyde with mercaptoacetic
acid and thiosemicarbazide in the presence of concentrated sulfuric acid to synthesized 5,5'-(1,4-phenylene)bis(5Hthiazolo[4,3-b][1,3,4]thiadiazol-2-amine)[I] then the azo compound [II] synthesized by coupling between diazonium salt of
the compound [I] with phenol at (0-4) ̊C., after that the compound [III] was synthesized by the reaction of the compound [II]
with methyl bromide in alkaline media. The compounds are characterized by melting points, FTIR and 1HNMR spectroscopy.
The mesomorphic behavior was stu
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