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Advanced Materials

Liquid crystals based on 2- fluoropyrimidine and -pyridine: synthesis, dielectric anisotropy and phase behavior*

Authors

  • Dr. Matthias Bremer

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    1. Liquid Crystal Research Frankfurter Strasse 250, D-64271 Darmstadt (Germany)64271 Darmstadt (Germany)
    • Liquid Crystal Research Frankfurter Strasse 250, D-64271 Darmstadt (Germany)64271 Darmstadt (Germany)
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  • *

    I thank Michael Günther and Ralf Ročkopf for experimental assistance with the heterocycles, and my colleagues, whose names appear in the literature references, for the synthesis of the isocyclic compounds. Dr. Joachim Krause, Jörg Haas and Hermann Heldmann are gratefully acknowledged for characterizing the new liquid crystals.

Abstract

Polar liquid crystals with strongly positive dielectric anisotropies are of continuing interest to the display industry because theyhelp to lower both the operating voltage and the total power consumption of LCDs in portable devices. Fluorinated heterocyclic materials “Figure, right, MG = mesogenic group” are shown here to exhibit impoved mesophase properties and higher dielectric and optical anisotropies than commonly used materials used in the purely fluorine substituted moietie

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