Abstract
Longitudinal relaxation of 13 C and 1 H in chloroform dissolved in a nematic liquid crystal has been observed between 25 and 34°C at 89.6 and 400.1 MHz (for 1 H) by the selective and nonselective inversion recovery method. The data can be satisfactorily explained by a combination of fast reorientation of the solute and slow fluctuations in the nematic phase, under consideration of the intramolecular dipole-dipole and external random field interactions together with cross correlations between the two. Local structure fluctuations in the nematic phase have played a substantial role in the spin relaxations. The external random field interaction on the proton and the cross correlation relating this interaction have considerably been dependent on the observing frequency.
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