Which kind of isomerism exists between [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6]?
Answer & explanation
Correct answer: option 3
Coordination isomerism: This type of isomerism arises from the interchange of ligands between cationic and anionic entities of different metal ions present in a complex. An example is provided by [Co(NH3)6][Cr(CN)6], in which the NH3 ligands are bound to Co3+ and the CN– ligands to Cr3+. In its coordination isomer [Cr(NH3)6][Co(CN)6], the NH3 ligands are bound to Cr3+ and the CN– ligands to Co3+.