Coordination Polyhedron

The coordination polyhedron (or coordination polygon) is the three-dimensional spatial arrangement traced out by the ligand donor atoms/ions that are directly attached to the central atom. In K₄[Fe(CN)₆] the six carbon donor atoms of the cyanide ligands trace out an octahedron, so the coordination polyhedron is octahedral; in [Ni(CO)₄] the four carbon donor atoms trace …