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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/24949

    Title: Effects of reducing structural symmetry on mesophase behaviour: the synthesis and characterization of the 2-alkoxy-6-[4-(4-alkoxyphenyl)buta-1,3-diynyl]naphthalenes
    Authors: 徐秀福;Hsu, Hsiu-fu;Lin, Wei-chung;Lai, Ying-hui;Lin, Shu-yu
    Contributors: 淡江大學化學學系
    Date: 2003-06-01
    Issue Date: 2009-12-01
    Publisher: Taylor & Francis
    Abstract: Unsymmetrical 2-alkoxy-6-[4-(4-alkoxyphenyl)buta-1,3-diynyl]naphthalenes were synthesized and their mesomorphic properties studied. In addition to an increase the mesophase temperature range of 10°C, the melting temperatures are significantly lower while there is a less pronounced decrease in the clearing temperatures when compared with those of the symmetrical 1,4-bis(6-alkoxy-2-naphthyl)butadiynes. Further reducing the symmetry by introducing the two terminal chains of unequal length shows little effect on the mesogenic properties. Shortening the linker from a butadiynyne unit to an ethyne unit significantly reduces the overall mesophase and nematic temperature ranges but the smectic range markedly increases.
    Relation: Liquid Crystals 30(8), pp.939-944
    DOI: 10.1080/0267829031000136084
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

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