| Summary: | Synthesis and characterization of bent-shaped liquid crystal with azobenzene is presented
in this study. The bent-shaped liquid crystal was obtained from biphenyl as the central
core which was derived from resorcinol. There were four major steps in synthesizing this
bent-shaped compound. First was the diazonium coupling reaction which was then
followed by Williamson ether synthesis reaction. This reaction was continued with the
hydrolysis reaction and finally esterification took place. In this step, the carboxylic
compound reacted with resorcinol to form an ester. This reaction was catalyzed by DCC
and DMAP. The final compound obtained was 1,3'-Biphenyl[4-(4-
decanloxyphenylazo)benzoate] which was orange in color. The percentage of yield of the
compound was 13.76 % and the melting point was 186.25⁰C. The molecular structures of
the compounds were identified using FT-IR spectroscopy and ¹H NMR spectroscopy.
The final compound contained an ester functional group which was proven by the FT-IR
spectroscopy. This compound showed an absorption band at 1733.18 cm⁻¹ which
corresponds to the ester functional group. Besides that, ¹H NMR spectroscopy was used
to ascertain the molecular structure of the final compound. There was no mesophase
detected based on the DSC analysis. Therefore, the final compound was a crystalline
solid.
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