The deeply intense, signature purple coloration of the powerful oxidizing permanganate ion () explicitly cannot be explained by standard transitions, as the central is in a strictly configuration. Wha

Question

The deeply intense, signature purple coloration of the powerful oxidizing permanganate ion ($MnO_4^-$) explicitly cannot be explained by standard $d-d$ transitions, as the central $Mn$ is in a strictly $d^0$ configuration. What quantum mechanical mechanism genuinely produces this colour?

Prashant Kotian · Accepted Answer

Correct answer: B. In the highly oxidized ion, Manganese exists in a oxidation state with zero -electrons available for transitions. The intense color actually stems from Charge Transfer Spectra. An electron from the lone pairs situated on the oxygen ligands is momentarily excited by visible light into an empty -orbital on the highly electrophilic metal center. This heavy absorption completely filters out specific visible wavelengths, leaving the deep purple color.

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