Which type of structural isomerism is demonstrated by the pair of coordination compounds [Co(NH3)5(SO4)]Br and [Co(NH3)5Br]SO4?
Answer and explanation
Correct answer: C. Ionization isomerism
- Step 1: Structural isomers differ in the connectivity or arrangement of chemical bonds within the coordination sphere.
- Step 2: Ionization isomerism occurs when a ligand within the coordination sphere and a counterion outside the sphere exchange positions.
- Step 3: In aqueous solution, yields bromide ions ( giving a cream precipitate with ), whereas yields sulfate ions ( giving a white precipitate with ), confirming ionization isomerism.
Answer
Ionization isomerism
Why not the others: 'Linkage isomerism' arises with ambidentate ligands (such as or ) coordinating through different atoms; 'Coordination isomerism' occurs in compounds containing both cationic and anionic complex ions; 'Hydrate (solvate) isomerism' involves water molecules acting as ligands versus water of crystallization.
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