Potassium Permanganate

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Purple color of KMnO4 is mainly due to:

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1. **Electronic State**: In Permanganate ($MnO_4^-$), Manganese is in the **$+7$** oxidation state. Its configuration is **$3d^0$ (d-zero)**.
2. **Impossibility of d-d**: Since there are no electrons in the $d$-orbitals, typical $d\u2013d$ transitions (promotion between split $d$-orbitals) cannot occur.
3. **The Mechanism**: The intense purple color comes from **Ligand-to-Metal Charge Transfer (LMCT)**.
4. **Process**: Electrons shift from the filled $p$-orbitals of Oxygen (the ligand) to the empty $d$-orbitals of Manganese.
5. **Intensity**: Charge transfer transitions are much 'more allowed' than $d\u2013d$ transitions, which is why $KMnO_4$ has such a vivid, dark color even at low concentrations.

Potassium Permanganate

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