Effect of Structure on the Stability of Nematic Mesophases

  • Michael J. S. Dewar
  • A. Griffin
  • R. M. Riddle


Studies into the effect of structural modifications on the central ring of liquid crystals of the type
in which the central group is a non-benzenoid ring are rare (1, 2, 3). It was our purpose to extend the range of such ringed compounds and to reinvestigate some previously reported systems. As noted by Young et al (4) molecular modifications must be systematic and must be accompanied by as small a perturbation of the molecular properties as possible if one is to correctly analyze the results only in terms of the specific modification made. Therefore we have employed identical terminal and wing groups and have chosen central rings which insure the same length-to-breadth ratio as found in the molecule chosen as the reference compound bis-(p-methoxyphenyl)-terephthalate.


Lone Pair Central Group Central Ring Nematic Phase Isotropic Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    M.J.S. Dewar and R.S. Goldberg, J. Amer. Chem. Soc., 92, 1582 (1970).CrossRefGoogle Scholar
  2. 2.
    L. Verbit and R.L. Tuggey, Mol. Cryst. Liq. Cryst., 17, 49 (1972).CrossRefGoogle Scholar
  3. 3.
    M.J.S. Dewar and R.M. Riddle, unpublished work.Google Scholar
  4. 4.
    W.R. Young, I. Haller, and L. Williams, in Liquid Crystals and Ordered Fluids, J.F. Johnson and R.S. Porter, editors, Plenum Press, N.Y., 1970, p. 383.Google Scholar
  5. 5.
    R.S. Porter, E.M. Barrall, II, and J.F. Johnson, Accounts Chem. Res., 2, 53 (1969).CrossRefGoogle Scholar
  6. 6.
    G.W. Gray, Molecular Structure and the Properties of Liquid Crystals, Academic Press, New York, N.Y., Chapter 8, (1962).Google Scholar
  7. 7.
    For a discussion of this point see W. Elser, Mol, Cryst. Liq. Cryst., 8, 230 (1969) and ref. 2.Google Scholar
  8. 8.
    C.S. Oh, Mol. Cryst. Liq. Cryst., 19, 95 (1972).CrossRefGoogle Scholar
  9. 9.
    W.R. Young, I. Haller, and D.C. Green, J. Org. Chem., 37, 3707 (1972).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1974

Authors and Affiliations

  • Michael J. S. Dewar
    • 1
  • A. Griffin
    • 1
  • R. M. Riddle
    • 1
  1. 1.Department of ChemistryUniversity of Texas at AustinAustinUSA

Personalised recommendations