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The complexes $[Co(NH_3)_6][Cr(CN)_6]$ and $[Cr(NH_3)_6][Co(CN)_6]$ are the examples of which type of isomerism?
A
Geometrical isomerism
B
Linkage isomerism
C
Ionization isomerism
D
Coordination isomerism
Detailed Solution
In both compounds the cation and the anion are complex ions.
In the first, $NH_3$ ligands are bound to Co and $CN^-$ ligands to Cr; in the second, $NH_3$ ligands are bound to Cr and $CN^-$ ligands to Co.
The ligands have been interchanged between the cationic and anionic coordination entities of the two different metal ions.
This type of isomerism is called coordination isomerism.
Linkage isomerism needs an ambidentate ligand bound through different atoms, and ionisation isomerism involves exchange of a ligand with the counter ion, which is not the case here.
In the first, $NH_3$ ligands are bound to Co and $CN^-$ ligands to Cr; in the second, $NH_3$ ligands are bound to Cr and $CN^-$ ligands to Co.
The ligands have been interchanged between the cationic and anionic coordination entities of the two different metal ions.
This type of isomerism is called coordination isomerism.
Linkage isomerism needs an ambidentate ligand bound through different atoms, and ionisation isomerism involves exchange of a ligand with the counter ion, which is not the case here.