Clusters octahedral geometry

The oxidation state of the tetramanganese cluster, having octahedral geometry and N303 coordination, is Mn4Iv. Electrochemical investigation shows that the complex undergoes a reversible oxidation... 

Fig. 30. The capped octahedral geometry established for the Ost(CO)18 cluster. For reasons of clarity the carbonyls have been omitted.

The structures of the Cr6 core are affected by the terminal phosphine ligands. The variation of the chromium octahedra contrasts with molybdenum clusters, which always have almost regular octahedral geometry. In a crystal, the structure of a molecule is influenced by steric... 

Thus far, dimensional reduction has not been applied in this way to any of the other parent solids listed in Table I. Of particular interest are systems that straddle the divide between the edge-bridged and face-centered octahedral geometries. Will reduced niobium-molybdenum halide mixtures simply disproportionate or will they lead to new mixed-metal clusters If the latter, then where does the crossover in cluster geometries occur An important factor in applying dimensional reduction is recognizing the variability in the stable electron counts within a particular cluster system. An extreme case occurs... 

Octahedral geometries are closely maintained in the clusters in Table II, and direct metal-metal bonding would need to bisect these octahedral axes. It is a feature of many Os3 clusters that octahedral geometry at the metal atoms is maintained as far as constraints such as ring formation will allow. These... 

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