Sternheimer Antishielding of the Fluorine Ion in Octahedral (MeF6)4-Complexes of Transition Metals from Perturbed Angular-Correlation Measurements

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Abstract
Sternheimer antishielding factors of fluorine in octahedral transition metal complexes have been determined from nuclear quadrupole coupling data derived from differential perturbed angularcorrelation measurements taking into account ionic and covalent contributions to the electric field gradient at the fluorine nucleus. It has been found that the antishielding effect increases with increasing d-occupation in the metal ion, but is different for perovskite and rutile complexes and cannot be described by a scalar factor for the F--ions in rutile fluorides, where the fluor position is of less than axial symmetry

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