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Int. J. Mol. Sci. 2009, 10(11), 4772-4788; doi:10.3390/ijms10114772

Synthesis, Characterization and Texture Observations of Calamitic Liquid Crystalline Compounds

Received: 1 September 2009 / Revised: 1 October 2009 / Accepted: 19 October 2009 / Published: 4 November 2009
(This article belongs to the Special Issue Liquid Crystals)
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Several divinylic mesogenic monomers were synthesized based on coupling the monomer 4-(4-pentenyloxy)benzoic acid with chlorohydroquinone, 2,5-dihydroxyacetophenone, methylhydroquinone or 2-methoxyhydroquinone. This resulted in novel mesogens of phenylene esters with different lateral substituent groups. The effect of the lateral substituent group on the thermotropic phase behavior for these liquid crystalline compounds was investigated using DSC and optical polarized microscopy. All the mesogens proved to have a wide nematic liquid crystalline range. Only the phenylene ester, which has a methoxy lateral substituent, exhibited both nematic and smectic phases. Structural confirmation of all new derivatives was accomplished by 1H- and 13C-NMR spectroscopic analysis, along with CH elemental analysis.
Keywords: liquid crystalline texture; nematic phase; smectic phase liquid crystalline texture; nematic phase; smectic phase
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Qaddoura, M.A.; Belfield, K.D. Synthesis, Characterization and Texture Observations of Calamitic Liquid Crystalline Compounds. Int. J. Mol. Sci. 2009, 10, 4772-4788.

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Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert