Abstract
The spin Hamiltonian parameters g factors g i ( i = x, y, z) and the hyperfine structure constants A i of vitamin B 12r have been theoretically studied from the perturbation formulas of these parameters for a Co 2+(3d 7) ion with low spin ( S = 1/2) in rhombically distorted octahedra. The related crystal-field parameters are determined from the point-charge-dipole model and the local structure around Co 2+ in vitamin B 12r. The theoretical spin Hamiltonian parameters are in good agreement with the experimental data.
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