Coordination CompoundMedium
Question
The purple colour of KMnO4 is due to the transition
Options
A.C.T.(L → M)
B.C.T.(M → L)
C.d - d
D.p - d
Solution
The permangenate ion has an intense purple colour. Mn (+ VII) has a d0 configuration. So the colour arise from charge transfer and not from d - dspectra. In MnO4- an electron is momentarily changing O-- to O- and reducing the oxidation state of the metal from Mn(VII) to Mn(VI). Charge transfer requires that the energy levels on the two different atoms are fairly close.
O = (8) = 2, 6; Mn(25) = 2, 8, 15
K L K L M
Hence the charge transfer occurs from L → M.
O = (8) = 2, 6; Mn(25) = 2, 8, 15
K L K L M
Hence the charge transfer occurs from L → M.
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