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Solvent dependence of 13 C relaxation times and reorientational dynamics in tribromobenzene
Author(s) -
Chen A. F. T.,
Wang S. P.,
Schwartz M.
Publication year - 1988
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260260807
Subject(s) - chemistry , rotational correlation time , rotational diffusion , relaxation (psychology) , cage effect , viscosity , solvent effects , nuclear overhauser effect , thermodynamics , solvent , spin–lattice relaxation , diffusion , protonation , nuclear magnetic resonance , analytical chemistry (journal) , nuclear magnetic resonance spectroscopy , stereochemistry , molecule , organic chemistry , nuclear quadrupole resonance , physics , psychology , social psychology , ion
The 13 C spin–lattice relaxation times and nuclear Overhauser enhancements of protonated carbons in 1, 3, 5‐tribromobenzene 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 τ c 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 Hynes–Kapral–Weinberg theory furnished reorientational correlation times that were in virtually quantitative agreement with the experimental results.