Spin-Hamiltonian parameters for the VOF53− ion were determined from solution, frozen glass, powder, and single-crystal ESR spectra. The most important finding is the presence of superhyperfine splittings due to the equatorial and axial fluorine ligands; the strongest interaction is found to result from the in-plane π bonding between the 3dxy orbital of vanadium and the 2py orbitals of fluorine. Bonding in the complex ion has been discussed in terms of LCAO MO theory.
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Manoharan et al. (1968) studied this question.
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