ScienceDirectSynthesis and mesomorphic properties of new heterocyclic liquidcrystals with Central Ester–Chalcone linkages

Lim, Chery Yong Wei and Ha, Sie Tiong and Yeap, Guan Yeow and Sastry, S. Sreehari (2017) ScienceDirectSynthesis and mesomorphic properties of new heterocyclic liquidcrystals with Central Ester–Chalcone linkages. Journal of Taibah University for Science, 11 (1). pp. 133-140. ISSN 1658-3655

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    Abstract

    A series of new calamitic liquid crystals, 4-[3-(pyridin-4-yl)prop-2-enoyl]phenyl 4-alkyloxybenzoates, comprising a pyridyl core,ester–chalcone central linkage and terminal alkyloxy chain were synthesized and characterized. This series consists of four membersthat differ by the length of the alkyloxy chain (CnH2n+1O , where n = 10, 12, 14, 16). The structures of the title compounds wereelucidated using spectroscopic and spectrometric techniques, such as FT-IR, NMR (1H and13C) and EI-MS. The mesomorphicproperties were studied using differential scanning calorimetry and optical polarizing microscopy. The decyloxy-containing com-pound was found to be non-mesogenic, whilst the compounds containing n-dodecyloxy to n-hexadecyloxy chains exhibited anenantiotropic smectic A phase with a fan-shaped texture. From the structure–property relationship study, it was proposed that thenumber of carbons in the alkyloxy chain must be at least 12 (n ≥ 12) to generate the smectic phase in the corresponding substitutedArCOOArCOCH CHC5H4N compounds.

    Item Type: Article
    Subjects: Q Science > QD Chemistry > QD1-999 Chemistry
    Divisions: Pusat Pengajian Sains Kimia (School of Chemistry) > Article
    Depositing User: Mr Noorazilan Noordin
    Date Deposited: 26 Oct 2017 10:59
    Last Modified: 26 Oct 2017 10:59
    URI: http://eprints.usm.my/id/eprint/37239

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