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CONCEPT OF COLOUR IN METAL COMPLEXES:

(1) Origin of colours:
(2) d-d transition:
(3) Selection rule of d-d transition:
(4) Charge transfer:
Colour originated by charge transfer when electronic transition occurs from one part of the Complex to other part i.e such type are also called internal Redox reaction .
Intensity of clour in such type transition is very high as they donot require to follow any selection rule.
(A) Charge transfer from ligands to metal:
Examples , MnO4 - , MnO4 -2 , CrO4 -2, Cr2O7 -2 , [Fe(H2O)5(NO)]+2 , Na4[Fe(CN)5(NOS)].

(B) Charge transfer from metal to ligands:
Examples, [Fe(CO)5] , [Fe (pi-C2H5)2],  [Cr (pi-C6H6)2],

(C) Charge transfer from metal  to metal:
Examples - Prussian Blue: Fe4[Fe(CN)6],
                      Turnbull Blue: Fe4[Fe(CN)6],

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