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what is the cause of colour of potassium permagnate

what is the cause of colour of potassium permagnate
 

Grade:12

1 Answers

Umakant biswal
5349 Points
7 years ago
dear yuvraj
The color in KMnO4 arises from an electronic transition, but it is actually not a d-d transition, since the Mn in this compound has no d electrons. 
it arises from a charge transfer reaction within a molecule , in which photon promote an electron from the highest energy molecular orbital in one of the Mn-o bond to an empty d orbital on the manganese , 
the promotion in equivalent to the energy of a yellow photon 
so, yellow light is absorbed leaving us to see its purple colour . 
REGARDS 
 

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