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Ion pairing and the rotational mobility of organic ions in solution

✍ Scribed by George C. Levy; J. TerryBailey

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
315 KB
Volume
13
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Carbon‐13 dipolar spin‐lattice relaxation times can be used to study microscopic ion mobility in solvent‐separated and contact ion‐pair systems. Two chemically stable ion pairs were studied. Cyclohexylammonium formate observed in a number of solvents allows correlation of relaxation times—and therefore ion rotational mobility—with empirical solvent polarity indices. Estimation of the effective anion radius shows a change of a factor of three in size arising from solvation/ion‐pairing effects. Trimesate trianion (1,3,5‐tricarboxybenzene) with differing cations present in solution is a good probe of changes in the solvation sphere and degree of ion aggregation. Variable temperature studies give an activation energy for overall ionic reorientation of c. 5 kcal/mol.

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