Document Type

Article

Date

12-14-1974

Embargo Period

3-27-2013

Keywords

Chemistry

Disciplines

Chemistry

Description/Abstract

The isotropic contact NMR shifts of the coordinated cis and tram methanol methyl proton resonances of a series of Co(CH30H)5X2+ complexes were measured, where the ligand X was pyridine, /I- and a-picoline, DMF, DMSO, acetonitrile, and water. The question of how to separate the observed shifts into their respective Fermi contact and dipolar (pseudocontact) contributions was examined in detail with the result that a new procedure for carrying out the separation was proposed. The dipolar shifts for these complexes were found to vary widely, with the acetonitrile complex exhibiting the largest dipolar shift. For the DMSO and water complexes the sign of the dipolar shift was reversed relative to the others. Qualitatively this sign reversal may be related to the difference in ligand field strengths of methanol and X relative to the spin orbit soupling constant for cobalt (II). It was also concluded that the Fermi contact shift varied between complexes.

Additional Information

Copyright 1975 Magnetic Resonance. This article may be downloaded for personal use only. Any other use requires prior permission of the author and Magnetic Resonance.

The article may be found at

http://dx.doi.org/10.1016/0022-2364(75)90155-9

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