On the Benzene Ring Rotations in Liquid Crystals

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Abstract
By using IR correlation function analysis for benzene ring rotaions of liquid crystal HOAB it has been found that these rotations occur in random angular jumps of 30[ddot] in the smectic phase and of 60[ddot] in the nematic and isotropic phases. The corresponding rotaional correlation times are of the order of 10−12 s which aapears to be comparable with those for benzene ring rotations in ordinary organic liqids.