Vibrational Spectra of Liquid Crystals. VIII. Infrared Spectroscopic Measurements of Order in Nematics and Nematic Solutions

  • Bernard J. Bulkin
  • Terry Kennelly
  • Wai Bong Lok


In an early study of the infrared spectrum of a nematic phase, Neff et. al. (1) used infrared dichroism to examine the effect of an electric field on the intensity of the CN stretching vibration in 4-methoxybenzylidene-4′-cyanoaniline. The dichroic ratios were used to obtain values of the order parameter as a function of field strength.


Liquid Crystal Vibrational Spectrum Nematic Phase Infrared Band Transition Moment 
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  1. 1.
    V.D. Neff, L.W. Gulrich, and G.H. Brown, in G.H. Brown, G.J. Dienes and M.M. Labes, eds., Liquid Crystals, Gordon & Breach, New York, 1966, pp. 21–35.Google Scholar
  2. 2.
    I. Chabay, Chem. Phys. Lett., 17, 283 (1972).CrossRefGoogle Scholar
  3. 3.
    B. Schrader and E-H Körte, Angew. Chem. Internat. Ed., 11, 226 (1972).CrossRefGoogle Scholar
  4. 4.
    B.J. Bulkin and W.B. Lok, J. Phys. Chem., 77, 326 (1973).CrossRefGoogle Scholar
  5. 5.
    J.P. Hegar and R. Mercier, Helv. Phys. Acta., 45, 886 (1972).Google Scholar
  6. 6.
    See for example, L.J. Bellamy, The Infrared Spectra of Complex Molecules, 2nd ed., Methuen, London, 1958.Google Scholar

Copyright information

© Plenum Press, New York 1974

Authors and Affiliations

  • Bernard J. Bulkin
    • 1
  • Terry Kennelly
    • 1
  • Wai Bong Lok
    • 1
  1. 1.Hunter College of the City University of New YorkNew YorkUSA

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