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Synthesis and Characterization of New Main Chain Liquid Crystalline Coumarin Compound with Ester Moiety  

Lee, Jong-Back (Department of Chemical Engineering, Dongeui University)
Kang, Byung-Chul (Department of Chemical Engineering, Dongeui University)
Lee, Gang-Choon (Department of Chemical Engineering, Dongeui University)
Lee, Dong-Jin (Korea Institute of Ceramic Engineering & Technology)
Hideyuki, Kihara (Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST))
Publication Information
Elastomers and Composites / v.44, no.4, 2009 , pp. 416-422 More about this Journal
Abstract
4-(6-bromohexyloxy)benzoic acid was synthesized from benzyl 4-Hydroxybenzoate and 1,6-dibromohexane. It was reacted with hydroquinone to obtain a new mesogenic ester having an bromine group. One kind of new photoresponsive coumarin compound was prepared by the reaction of mesogenic ester with coumarin sensitive to the ultraviolet. Structures of the compound were identified by FT-IR and $^1H$-NMR spectroscopies. Their phase transition temperatures and thermal stability were also investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and x-ray diffraction analysis. From optical polarizing microscopy, the prepared compound was found to show enantiotropic liquid crystallinity with smectic and nematic textures.
Keywords
4-(6-bromohexyloxy)benzoic acid; coumarin compound; liquid crystallinity; DSC; POM; X-ray;
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