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    Title: Synthesis and Mesomorphic Properties of Multiynylthiophenes: 2, 3, 4, 5-Tetrakis(4-alkoxyphenylethynyl)thiophenes and 2, 3, 5-Tris(4-alkoxyphenylethynyl)thiophenes
    Authors: 徐秀福;Hsu, Hsiu-fu
    Contributors: 淡江大學化學學系
    Date: 2004-06-15
    Issue Date: 2009-12-01
    Publisher: American Chemical Society (ACS)
    Abstract: The synthesis and characterization of multiynylthiophenes, tetrakis(4-alkoxyphenylethynyl)thiophenes (1) and tris(4-alkoxyphenylethynyl)thiophenes (2), are reported, and their structure−mesomorphism relationship is discussed. The tetraynyl series 1 with a trapezoid core do not show any liquid-crystalline properties. With one less peripheral arm, series 2 compounds are of the Y-shape geometry with rigid linear spacers and nematic phases are observed for the octyloxyl, decyloxyl, and dodecyloxyl derivatives. Although the dipole−dipole interactions, desymmetrization, and disparity of the mesogenic cores can be accountable for their corresponding mesomorphic behaviors, the formation of the nematic phases of 2 may be most likely attributed to the shape disparity of these two series of compounds.
    Relation: Chemistry of materials 16(12), pp.2379-2385
    DOI: 10.1021/cm030612t
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

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