The coordination number of the metal ion is 6.
Coordination isomerism occurs in compounds containing complex anionic and sophisticated cationic parts and can be viewed as an interchange of some ligands from the cation to the anion.
Hence, there are two complex compounds bound together, one with a charge and the other with a positive charge.
In coordination isomers, the anion and cation complexes of a complex exchange one or more ligands.
For example, the [Zn(NH3)4][Cu(Cl4)] and [Cu(NH3)4][Zn(Cl4)] compounds are coordination isomers.
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