Coordination isomerism is a form of structural isomerism in which the composition of the coordination complex ion varies. In a coordination isomer the total ratio of ligand to metal remains the same, but the ligands attached to a specific metal ion change. Examples of a complete series of coordination isomers require at least two metal ions and sometimes more.
For example, a solution containing ([Co(NH)] and [Cr(CN)]) is a coordination isomer with a solution containing [Cr(NH)] and [Co(CN)].