Abstract
The nuclear spin-lattice relaxation times of the nematogen PAA in the isotropic phase and of some nonmesomorphic azobenzene and azoxybenzene derivatives have been measured. A similar behaviour of the phenyl carbon T 1, temperature dependence has been obtained for the mesogenic and non-mesogenic compounds. It is also shown that for PAA the reorientation rate of the methoxy group is comparable with the molecular diffusion rate.
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