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Saturday, August 24, 2019

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 -1 , 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:


Prussian Blue: Fe4[Fe(CN)6]3    

Turnbull Blue: Fe4[Fe(CN)6]3

Related Question:


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