The 13C relaxation measurements were obtained for all resolved carbon resonances in the nematic and isotropic phases of MBBA. Also obtained were the NOE measurements in the isotropic phase. The study indicates that a flexibility gradient occurs along the n-butyl chain and that the 13C relaxation is governed by the anisotropic rotational diffusion of the entire molecule.
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Hutton et al. (1978) studied this question.
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