Photo- and Thermochromic Liquid Crystal Polysiloxanes

Authors

  • Dr. Ivan Cabrera,

    1. Department of Structural Chemistry, The Weizmann Institute of Science, Rehovot 76100 (Israel)
    Search for more papers by this author
  • Prof. Dr. Valeri Krongauz,

    Corresponding author
    1. Department of Structural Chemistry, The Weizmann Institute of Science, Rehovot 76100 (Israel)
    • Department of Structural Chemistry, The Weizmann Institute of Science, Rehovot 76100 (Israel)
    Search for more papers by this author
  • Prof. Dr. Helmut Ringsdorf

    Corresponding author
    1. Institut für Organische Chemie der Universität, J.-J. Becher-Weg 18-20, D-6500 Mainz (FRG)
    • Institut für Organische Chemie der Universität, J.-J. Becher-Weg 18-20, D-6500 Mainz (FRG)
    Search for more papers by this author

  • This work was supported by the Minerva Foundation, Munich (FRG).

  • Dedicated to Professor Ernst Fischer on the occasion of his 65th birthday

Abstract

original image

The liquid crystalline polysiloxanes 1 display a controllable range of colors. Irradiation of film with visible light results in a pale yellow color; irradiation of the yellow film with UV light results in a deep red color. If yellow film is irradiated with UV light at −20°C, it turns blue. Upon subsequent irradiation with visible light, it turns yellow once again. The blue film is stable at −20°C in the absence of light; upon warming to above −10°C, however, it turns red.

Ancillary