Some Mechanistic Aspects of the Cholesteric Liquid Crystal Induced Circular Dichroism (LCICD) Phenomenon

  • F. D. Saeva


Mechanistic aspects of the LCICD phenomenon have been investigated as an extension of our initial observation that achiral molecules dissolved in cholesteric liquid crystals display circular dichroism in the region of their electronic transitions.

LCICD has been previously found to be dependent on the chirality of the cholesteric helix, orientations of electric transition dipoles and λo of the cholesteric pitch band. More recently the LCICD intensity has been observed to be a function of the pitch of the cholesteric mesophase, temperature and texture. The sign of the LCICD has been found to be dependent on the cholesteric matrix as well as on its chirality. The results of solute concentration studies will also be presented along with a discussion of the origin of LCICD in terms of the following two proposed mechanisms:
  1. 1.

    exposure of the dissolved solute to a helical ordering of liquid crystal molecules, and

  2. 2.

    helical ordering of solute within the cholesteric structure.



Liquid Crystal Circular Dichroism Cholesteric Liquid Crystal Liquid Crystal Molecule Circular Dichroism Band 


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Copyright information

© Plenum Press, New York 1974

Authors and Affiliations

  • F. D. Saeva
    • 1
  1. 1.Xerox CorporationRochester Research CenterWebsterUSA

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