화학공학소재연구정보센터
Journal of Physical Chemistry A, Vol.103, No.11, 1447-1456, 1999
NMR relaxation studies of the (CH3)-C-13 spin grouping in the vicinity of the T-1 minimum
The perturbation-response behavior of various nuclear spin polarizations associated with methanol's (CH3)-C-13 spin grouping were examined in the vicinity of the T-1 minimum. Dipole-dipole auto- and cross-correlation spectral densities indicate unhindered methyl rotation about a triad axis oriented perpendicular to the principal axis of an axially symmetric reorienting molecular framework. This finding is consistent with a strongly associated solute (methanol)/solvent (glycerol) mixture. In the motional regime investigated, it is predicted that relaxation-induced polarization transfer is manifest in differential frequency shifts of various multiplet components. Indeed, this study clearly demonstrates reproducible second order spectral shifts. However, the theory developed in this work accounts for only a portion of the observed shifts.