Two compounds from alkylcyanobiphenyl series, 4-n-pentyl-4'-cyanobiphenyl (5CB) and 4-n-hexyl-4'-cyanobiphenyl (6CB) were investigated by FTIR spectroscopy in the two phase states, namely crystalline and liquid crystal ones. The differences in the band shapes in the FTIR spectra of the two phases have been observed and analyzed in order to verify theoretical results regarding orientational order in the two phases of LC compounds. The spectral -structural correlations, which reflect the development of spatial geometry of the LC molecules, has been found.
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