Question

Why absorption of kmno4 occurs at bluish green region of spectrum?

Answer 1

The oxidation state of Mn in KMnO4 is +7, which means that Mn does not have any d electrons left. Theoretically, Mn7+ complexes should not be colored because electronic transitions are not possible (since there are no d electrons left). However, KMnO4 has a deep purple color because of charge transfer from the ligand (O2–) to the metal center. This is called a ligand-to-metal charhmge transfer. Charge transfers are beyond Laporte and spin selection rules thus they are always allowed giving the complex very high molar extinction coefficients.
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