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Advanced Materials

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

Authors

  • Dr. Matthias Bremer

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

    I thank Michael Günther and Ralf Roßkopf 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, Jorg 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 they help to lower both the operating voltage and the total power consumption of LCDs in portable devices. Fluorinated heterocyclic materials (Figure, right, where MG is a mesogenic group) are shown here to exhibit improved mesophase properties and higher dielectric anisotropies than commonly used materials based on carbocyclic structures (Figure, left)

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