ISSN:
0749-1581
Keywords:
13C relaxation
;
Molecular reorientation
;
Rotational diffusion
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Although dibromomethane is a simple molecule, little work has been directed toward the analysis of its reorien-tational motion. This is surprising, since two components of its inertia tensor are nearly degenerate and may, in principle, be treated as a quasi-symmetric top. The 13C spin-lattice relaxation times and nuclear Overhauser enhancements were measured at various temperatures in the liquid phase. Field-dependent measurements indicated the presence of the scalar relaxation mechanism. Calculated rotational diffusion constants were found to be in reasonable agreement with values predicted by the J-diffusion model of inertially controlled reorientation. The results show that scalar coupling of the second kind is an important mechanism for 13C spin-lattice relaxation in this molecule. The data further indicates that dibromomethane may indeed be exhibiting quasi-symmetric top behavior of this phase.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260280104
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