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CH1012
4-COORDINATE COMPLEXES II
This tendency towards a tetrahedral geometry is sometimes over-ridden by
the directional properties associated
with the orientation of the d-orbitals and a
square planar geometry is observed for the d8-metal ions      eg Pt(0) 6s15d9     Pt(II) 5d8.
Zn(NH3)42+
4so3d10
Pt(NH3)2Cl2
6so5d8