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Abstract
The temperature dependence of the trace of the polarizability tensor was investigated for three liquid crystals, CB7, PCH 7, CCH7 whose molecule differ by the change of the molecule core. The results show that rotations of fragments of a molecule exist in the nematic phase of liquid crystals as well as in the solid state of CB7 and PCH7 liquid crystals. A linear temperature dependence of α s exists in the isotropic liquid state of liquid crystals as well as for low molecular weight liquids.