Advanced Materials

Liquid crystalline α, α-difluorobenzyl phenyl ethers


  • Ekkehard Bartmann

    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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    • Dedicated to Prof. Rudolf Gompper on the occasion of his 70th birthday

  • I thank Andreas Ruhl for carrying out the chemical syntheses, and Ulrich Finkenzeller, Kazuaki Tarumi, Joachim Krause, Ray Jubb, Heike Kniel, Helga Schubert, Brigitte Schuler, Elke Kurbel, Helga Haas, Jörg Haas and Hermann Heldmann for the measurement of the LC-related physical properties. The NMR and MS spectra were prepared by the Central Analytical Laboratory of E. Merck.


Liquid crystalline compounds containing a difluoromethyleneoxy (CF2O) bridge, which increases the polarity, have been synthesized and investigated. The physical properties related to liquid crystal applications (i.e., phase transitions, viscosity, dielectric anisotropy, birefringence) are reported. The compounds shown unusually low viscosities in combination with mostly reasonable or good values of the other parameters, making them highly interesting for applications in modern display technologies.