REORIENTATIONAL LINESHAPE ANALYSIS OF THE NEMATIC AND ISOTROPIC PHASES OF 4-CYANO-4' -PENTYLBIPHENYL

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1977

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Ohio State University

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Theoretical considerations have shown that vibrational band shapes in isotropic media will he superpositions of Lorentzian. lines; however, in an anisotropic environment, non-Lorentzian band shapes are $predicted.^{1}$ In order to test this theory, we have measured the reorientational lineshape of the $C\equiv N$ stretching vibration of the liquid crystal, 4-cyano-$4^{\prime}$ -pentylbipbenyl (5CB), in its isotropic and nematic phases, The latter conveniently provides an anisotropic medium, Raman spectra in the 2220 $cm^{-1}$ region, obtained above and below the phase transition temperature, will be presented and discussed.

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$^{1}$R. I. Cukier, J. Chem. Phys. 60, 734 (1973).
Author Institution: Department of Chemistry, Michigan State University

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http://hdl.handle.net/1811/10139

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Abstracts of OSU International Symposium on Molecular Spectroscopy 1970-1979