Coordination isomerism involves the interchange of ligands between cationic and anionic entities. In [Co(NH₃)₆][Cr(CN)₆], NH₃ binds to Co³⁺ and CN⁻ to Cr³⁺. In its coordination isomer [Cr(NH₃)₆][Co(CN)₆], the ligand binding arrangement switches.
Explain the concept of coordination isomerism with an example involving [Co(NH₃)₆][Cr(CN)₆].
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Coordination isomerism arises when there is a redistribution of ligands between the cation and anion in a coordination compound. In [Co(NH₃)₆][Cr(CN)₆], coordination isomerism is demonstrated. The hexaamminecobalt(III) cation and hexacyanochromate(III) anion interchange ligands. The possible coordination isomers include [Cr(NH₃)₆][Co(CN)₆], where chromium coordinates ammonia, and [Co(NH₃)₆][Cr(CN)₆], where cobalt coordinates cyanide. This interchange affects the chemical and physical properties of the isomers. Coordination isomerism highlights the versatility of ligand distribution within coordination compounds, influencing their reactivity and behavior.