11I think this is because there can be a large number of transitions of electons and this will lead to higher chance of getting radiations in visible range!
Complexes in which two metals of different oxidation state are close together are frequently highly coloured.Why?
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8 Answers
1111i mean electron transfer from the D orbital of 1st metal to the 2nd metal atom..
1the transition metal cation having partly filled up (n-1)d orbitals undergo d-d transition of electron in their compounds. the wavelength of the radiation absorbed in this d-d transition falls in the visible range of electromagnetic spectrum. this makes the compounds of transition metals coloured.
1this is due to charge transfer from one metal to another......maybe
my chem sir had said that colour due to charge transfer i.e transfer of electron from one metal to another or from ligandl to metal results in deeper colours
eg: Fe+2 is light green but brown ring is quite deep coloured cos colour here is due to charge transfer from NO to Fe
19may be some stuff relating to jump of electrons from non bonding orbitals to anti bonding orbitals !!!