Concerning the magnetic properties of covalent octahedral cobalt complexes

Abstract
A detailed theory is developed for the effects of covalency on the magnetic properties of a Co2+ion surrounded by a regular octahedron of ligands. In contrast to previous studies of the cobalt ion, the strong-field representation has been used, in which the octahedral field is diagonalized before the electrostatic interactions. Expressions are derived for the orbital contribution to thegvalue, and for the ligand hyperfine interactions, in terms of the ligand wave function admixture coefficients. The theory is applied to the electron spin resonance measurements on a Co2+: KMgF3crystal. In the usual notation the covalent bonding fractions arefσ= 2.9±1.0%,fπ= 1.9∓1.0%,fs= 0.54±0.03%, ½(fσ+fπ) = 2.4±0.3%. These results are compared with the results of other authors on different iron group ions.

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