Coordination Compounds

Coordination Compounds

Question

The Colour of KMnO4 is due to 

  • M → L charge transfer transition

  • d-d transition

  • L →M charge transfer transition

  • σ →σ*

Answer

C.

L →M charge transfer transition

KMnO4 → K+ + MnO-4
Therefore,
In MnO4-, Mn has +7 oxidation state having no electron in d- orbitals.
It is considered that higher the oxidation state of metal, greater is the tendency to occur L →M charge transfer because ligand is able to donate the electrons into the vacant d- orbital of metal.
Since, charge transfer is Laporte as well as spin allowed, therefore, it shows colour.

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