Abstract
Abstract A quantitative assessment of solid-state structural data on five coordinated compounds of both transition and main group elements establishes the geometrical change in the square pyramid as a function of d-orbital configuration. In terms of the trans basal angle θ, a variation in the range 140–174° is obtained. These angle variations are interpreted in terms of nonbonded repulsions between d-orbital electron density and bond electron density. Structural distortion from the trigonal-bipyramidal and square-pyramidal geometries are determined for the five-coordinated compounds by using a dihedral angle method. It is found that the local distortion coordinate for transition-metal complexes approximates the Berry intramolecular exchange coordinate. Main group pentacoordinated compounds follow this coordinate more closely.
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