Coordination Number 7

Not very common for 1st row complexes and the energy difference between the structures seems small and distortions occur so that prediction of the closest "idealized" shape is generally difficult. Three geometries are possible:

• Capped octahedron (C_3v) Geometry

Figure 1: K₃[NbOF₆]

• Capped trigonal prism (C_2v)

• Pentagonal Bipyramid (D_5h)

Figure 2: bis-(tert-butylacac)₂(DMSO)di-oxoUranium