FT-IR LINEAR DICHROIC SOLUTE SPECTRA OF NEMATIC SOLUTIONS AS A TOOL FOR IR BAND ASSIGNMENT

FT-IR polarization spectra of diphenylacethylene (tolane), pyrene and maleic anhydride, dissolved and oriented in a nematic liquid crystal m ixture, were recorded and processed by means of the Thulstrup-Eggers p rocedure of stepwise reduction. The IR active vibrations could be uneq uivocally assigned to their symmetry classes on the basis of their ban d polarizations. Some peculiarities were observed for the polarization s of a few spectral bands.