Stable, Low-Temperature Discotic Nematic Superstructures by Incorporating a Laterally Substituted Sidearm in Hexakis(phenylethynyl)benzene Discogens

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Title:	Stable, Low-Temperature Discotic Nematic Superstructures by Incorporating a Laterally Substituted Sidearm in Hexakis(phenylethynyl)benzene Discogens
Authors:	Chien, Shih-chien;Chen, Hsiu-hui;Chen, Hsin-chou;Yang, Yu-ling;Hsu, Hsiu-fu;Shih, Tzenge-lien;Lee, Jey-jau
Contributors:	淡江大學化學學系
Keywords:	Liquid crystals;discotic;nematic;Mesogens;Structure-property relationships;Supramolecular materials
Date:	2007-08
Issue Date:	2009-12-01
Publisher:	Weinheim: Wiley - V C H Verlag GmbH & Co. KGaA
Abstract:	A new strategy for preparing room-temperature discotic nematic materials is proposed and developed stepwise to improve various discotic nematic properties. This approach replaces one sidearm of the discotic hexakis(4-hexyloxyphenylethynyl)benzene with a tris(alkoxy) sidearm, 1-ethynyl-2,3,4-tris(hexyloxybenzene), to lower transition temperatures, manipulate discotic nematic ranges, and preserve the discotic nematic superstructure while preventing column formation. Although symmetry considerations play a role in the resulting mesogenic properties, steric hindrance and van der Waals interactions are ascribed to the superior discotic nematic properties of the newly prepared discogens containing a laterally substituted sidearm.
Relation:	Advanced Functional Materials 17(12), pp.1896-1902
DOI:	10.1002/adfm.200601019
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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