Advertisement

The Preparation and Thermodynamic Properties of Some Chiral 4-Alkyl-4′-Cyanostilbenes and Tolans

  • Robert J. Cox
  • Nicholas J. Clecak
  • Julian F. Johnson
Chapter

Abstract

It is well established that optically active nematogens exhibit cholesteric mesophases. The term “chiral nematic” was coined by Dolphin1 to describe this general class of liquid crystals. Examples of chiral nematic liquid crystals have been synthesized based on Schiff bases1,2 aromatic esters,3 cinnamic esters4 and biphenyls.5 We have recently prepared two new series of liquid crystals with the trans stilbene and tolan structures6,7 and have now obtained the optically active analogs in these series. This paper will describe the compound preparation and list the thermodynamic properties that were obtained.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D. Dolphin and Z. Muljiani, J. Chem Phys. 58, 413 (1973).CrossRefGoogle Scholar
  2. 2.
    J. A. Castellano, C. H. Oh, M. T. McCaffrey, Mol. Cryst. Liq. Cryst. 27, 417 (1973).CrossRefGoogle Scholar
  3. 3.
    B. H. Klanderman, T. R. Criswell, J. Am. Chem. Soc. 97, 1585 (1975).CrossRefGoogle Scholar
  4. 4.
    M. Leclercq, J. Billard, J. Jacques, Mol. Cryst. Liq. Cryst. 8, 367 (1969).Google Scholar
  5. 5.
    G. W. Gray and D. G. McDonnell, presented at the Sixth International Liquid Crystal Conference, Kent State University, Kent, Ohio, August 1976.Google Scholar
  6. 6.
    R. J. Cox and N. J. Clecak, Mol. Cryst. Liq. Cryst. 37, 263 (1976).CrossRefGoogle Scholar
  7. 7.
    R. J. Cox and N. J. Clecak, Mol. Cryst. Liq. Cryst. 37, 241 (1976).CrossRefGoogle Scholar
  8. 8.
    E. M. Barrail II and J. F. Johnson, Liquid Crystals and Plastic Crystals, G. W. Gray and P. A. Winsor, editors, Vol. II, E. Horwood, Chichester, England (1974), p. 254.Google Scholar

Copyright information

© Springer Science+Business Media New York 1978

Authors and Affiliations

  • Robert J. Cox
    • 1
  • Nicholas J. Clecak
    • 1
  • Julian F. Johnson
    • 1
    • 2
  1. 1.IBM Research LaboratorySan JoseUSA
  2. 2.University of ConnecticutStorrsUSA

Personalised recommendations