Question

Explain ionisation isomerism and linkage isomerism in coordination compounds with example.

Hint:

Ionisation isomerism occurs due to exchangeable ions, while linkage isomerism occurs when a ligand bonds through different atoms.

Answer 1

Step 1: Ionisation Isomerism: - Occurs when two coordination compounds produce different ions in solution but have the same molecular formula. - Example: \[ [Co(NH_3)_5Br]SO_4 \quad \text{and} \quad [Co(NH_3)_5SO_4]Br \] Step 2: Linkage Isomerism: - Occurs when a ligand can bind through two different donor atoms. - Example: \[ [Co(NO_2)(NH_3)_5]^{2+} \quad \text{(Nitro complex, N-bound)} \] \[ [Co(ONO)(NH_3)_5]^{2+} \quad \text{(Nitrito complex, O-bound)} \]