Abstract
Assuming the Neugebauer relations to be valid we have made calculations with regard to the effective polarizabilities and hence the optical anisotropy in smectic and cholesteric mesophases of five cholesteryl esters of fatty acids. The variation of optical anisotropy as a function of temperature and the change in optical anisotropy as we pass from the lowest temperature in the smectic phase to the lowest temperature of the cholesteric phase are correlated with the number of C-C bonds in the alkyl end groups of the molecules. It emerges that the end groups do not contribute significantly to the effective optical anisotropy owing to the existence of rotational isomerism.
Similar content being viewed by others
References
Hartshorne N H and Stuart A 1970Crystals and polarising microscope 2 edn (London: Edward Arnold) p. 151
Krishnamurti D and Subramhanyam H S 1975Mol. Cryst. Liq. Cryst. 31 153
Madhusudana N V 1980Mol. Cryst. Liq. Cryst. 59 117
Pelzl G and Sackmann H 1973Phys. Chem. 254 354
Subramhanyam H S 1976Acta Cienc. Indica 2 187
Subramhanyam H S and Krishnamurti D 1973Mol. Cryst. Liq. Cryst. 22 239
Winchell N W 1954The optical properties of organic compounds (New York: Academic Press) p. 274
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Subramhanyam, H.S., Hunjan, U.S. Optical anisotropy of some cholesteryl esters of fatty acids. Pramana - J Phys 23, 639–643 (1984). https://doi.org/10.1007/BF02846686
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02846686
Keywords
- Optical anisotropy
- cholesteryl esters
- fatty acids
- Neugebauer relations
- smectic phase
- cholesteric phase
- rotational isomerism