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Solvent dependence of 13C relaxation times and reorientational dynamics in tribromobenzene

✍ Scribed by A. F. T. Chen; S. P. Wang; M. Schwartz

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
374 KB
Volume
26
Category
Article
ISSN
0749-1581

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✦ Synopsis

The "C spin-lattice relaxation times and nuclear Overhauser enhancements of protonated carbons in 1,3,5tribromobenzene were measured in a number of solvents of widely varying viscosity. Derived reorientational correlation times were found to increase approximately linearly with solution viscosity, as predicted by hydrodynamic theories of rotational diffusion.

Rotational correlation times calculated from the Perrin stick model were two to three times longer than the measured t, values. Similarly, correlation times predicted by the Hu-Zwanzig slip model were too small by a factor of two. On the other hand, application of the newer HynesKapraI-Weinberg theory furnished reorientational correlation times that were in virtually quantitative agreement with the experimental results.

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