Synthesis and mesomorphic properties of -methylstilbene-based liquid crystals

    Authors

    C. Y. Chang; K. W. Ho; C. S. Hsu; C. H. Lin; S. Gauza;S. T. Wu

    Comments

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    Abstract

    Six series of -methylstilbene-based liquid crystals, i.e. 4-(4-alkylphenyl)-4'-amino--methylstilbenes (2a-e), 4-(4-alkylphenyl)-4'-cyano--methylstilbenes (3a-e), 4-(4-alkylphenyl)-4'-isothiocyanato--methylstilbenes (4a-e), 4'-(trans-4-alkylcyclohexyl)-4-fluoro--methylstilbenes (5a-e), 4'-(trans-4-alkylcyclohexyl)-4-amino--methylstilbenes (7a-e) and 4'-(trans-4-alkylcyclohexyl)-4-isothiocyanato--methylstilbenes (8a-e) were synthesised. All of these -methylstilbene-based compounds exhibit an enantiotropic nematic phase. Some of the 4-(4-alkylphenyl)-4'-isothiocyanato--methylstilbenes with longer alkyl chains exhibit a smectic A phase. All of the liquid crystals obtained exhibit a wide nematic range and high birefringence of 0.16-0.46. Both series of isothiocyanato-based, liquid crystal compounds 4a-e and 8a-e containing -methylstilbenes revealed much lower melting points and clearing temperatures than their cyano and amino homologues.

    Journal Title

    Liquid Crystals

    Volume

    36

    Issue/Number

    4

    Publication Date

    1-1-2009

    Document Type

    Article

    First Page

    425

    Last Page

    433

    WOS Identifier

    WOS:000267100700010

    ISSN

    0267-8292

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