Colour originated by
charge transfer when electronic transition occurs from one part of the Complex
to other part i.e. Such type is also
called internal Redox reaction.
Intensity of colour in such type transition is very high as they do not require following 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)].
Intensity of colour in such type transition is very high as they do not require following 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],
Examples, [Fe(CO)5] , [Fe (pi-C2H5)2], [Cr (pi-C6H6)2],
(C) Charge transfer from metal to metal:
Examples:
Examples:
(2) Prussian Blue:
Fe4[Fe(CN)6]3
IUPAC Name: Iron(III)hexacyanoferrate(II)
Common Name:
(Ferric ferrocyanide)
(2) Turnbull Blue: Fe3[Fe(CN)6]2
IUPAC Name: Iron(II)hexacyanoferrate(III)
Common Name:
(Ferrous ferricyanide)
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