Nine-coordinate compounds stereochemistry

Only two stereochemistries need be considered for nine-coordinate compounds ... 

Nine-coordinate zirconium occurs in ZrC5Hs(CF3COCHCOCF3)3 using the formalism according to which an % -cyclopentadienyl ligand occupies three coordination sites but the stereochemistry is not readily described in terms of idealized nine-vertex polyhedra.312,313 Compounds of the type... 

Albertsson, J., 1972d, On the Stereochemistry of Nine-Coordinate Lanthanoid Compounds, Thesis, Lund. 

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