Magneto-Structural Correlations in Linear and Bent Oxo-Bridged Transition-Metal Dimers: Comparisons, Interpretations, and Predictions of Ground-State Magnetic Properties

The angular dependence of the magnetic properties of all known octahedrally coordinated oxo-bridged dimers with trivalent 3d transition metals are interpreted in terms of the most simple concepts. These concepts are based on a combination of kinetic exchange and the chemically intuitive angular overlap model. The use of an angular overlap model allows the separation of the σ donor properties of the bridging oxide ligand into sσ and pσ contributions. An estimate of the sσ and the pσ angular overlap model parameters is given. An analysis of the magnetic properties of the known oxo-bridged dimers allows us to predict the magnetic properties of unknown oxo-bridged dimers with trivalent 3d transition metal ions.