(f) Coordination polyhedron
The spatial arrangement of the ligand atoms which are directly
attached to the central atom/ion defines a coordination
polyhedron about the central atom The most common
coordination polyhedra are octahedral, square planar and
tetrahedral For example, [Co(NH3)6]
3+ is octahedral, [Ni(CO)4] is
tetrahedral and [PtCl4]
2– is square planar Fig