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 - Prussian Blue: Fe4[Fe(CN)6],
Turnbull Blue: Fe4[Fe(CN)6],
Related Question:
Examples - Prussian Blue: Fe4[Fe(CN)6],
Turnbull Blue: Fe4[Fe(CN)6],
Related Question:
Which of the
Complex of the following pairs has the highest value of CFSE?
Colour of Complexes due to charge transfer:
Why violet colour of [Ti(H2O)6]Cl3 disapear (colourless) on heating heating ?
Why [Ni(CN)4]-2 is colourless while [Ni(H2O)4]-2 although both have +2 oxidation state and 3d*8 configuration ?
Why [FeF6]3– is colourless whereas [CoF6]3– is coloured ?
Why Fe(CO)5 is colourless while Fe(bipy)(CO)3 is intensely purple in colour ?
Why all the tetrahedral Complexes are high spin Complexes ?
Colour of Complexes due to charge transfer:
Why violet colour of [Ti(H2O)6]Cl3 disapear (colourless) on heating heating ?
Why [Ni(CN)4]-2 is colourless while [Ni(H2O)4]-2 although both have +2 oxidation state and 3d*8 configuration ?
Why [FeF6]3– is colourless whereas [CoF6]3– is coloured ?
Why Fe(CO)5 is colourless while Fe(bipy)(CO)3 is intensely purple in colour ?
Why all the tetrahedral Complexes are high spin Complexes ?
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