FIELD-DEPENDENCE OF CHEMICAL-SHIFTS IN COBALT(III) NMR-SPECTROSCOPY - THEORETICAL PREDICTIONS

Ramsey's suggestion of fourth-order perturbation theory contribution to a field-dependent chemical shielding arising from paramagnetic currents is more closely examined. The effect is shown to be opposite in sign to the field-invariant chemical shielding tensor and, for cobalt(III) chemical shifts, only becomes important for some complexes for field strengths in excess of 20 T. © 1979 Australian Journal of Chemistry, All rights reserved.