Dynamic Motion of Twisted πsystem-Induced Temperature-Dependent Dielectric Response in the Neat Liquid State

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    Abstract

    Molecular assemblies of twisted πmolecules of tetraphenylene with long alkoxy chains (1) and tetra[2,3]thienylene with long alkylamide chains (2) or long alkoxy chains (3) and their dielectric properties were investigated. Different degrees of intermolecular interaction of 1-3 afforded different molecular assemblies, including an ordered columnar structure, disordered columnar, and lamellar structures. The introduction of long alkyl chains enabled us to create thermally stable liquid crystalline or liquid states. Temperature-dependent dielectric measurement revealed that the dynamic flipping motion of the tetra[2,3]thienylene core of 3 induced a temperature- and frequency-dependent dielectric anomaly in the neat liquid phase. This flipping motion of the central tetra[2,3]thienylene πcore occurred relatively easily in the liquid state with a high degree of freedom of molecular motion.

    Original languageEnglish
    Pages (from-to)20152-20159
    Number of pages8
    JournalJournal of Physical Chemistry C
    Volume123
    Issue number33
    DOIs
    Publication statusPublished - 2019 Aug 22

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Energy(all)
    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films

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