1ok ani now i m with u
Fe2[Fe(CN)6]=blue
Zn2[Fe(CN)6]=bluish white
Cu2[Fe(CN)6]=chocolate brown
Colours in complexes are decided by the constituents of the coordination sphere, right? So why do K4[Fe(CN)6] and Fe2[Fe(CN)6] differ in colour though coordination sphere is intact?
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230 Answers
1
1i kno dat Zn is bluish wit in color......
but wat abt d complex...
11Ram, TR maari pesadha
Complex only is bluish white in colour
11Vishal is correct. These are products obtained in qualitative analysis of cations.
11Pandi, read the entire thread for full understanding of what's going on!
1@ Ramkumar .. u go on tlking abt cash prizes only ! 1 Lac yaad hai ? :P
1@mallika..
this s not reward dear.................
fine.............see that.......
11k, Bright ideas anyone?
@ Ram :
Mokka podardha niruthu da. Threadda perissakunadhu podhum!
3colours in a coordination cpd is depend on the oxdn state of the central metal ion. So this might be the reason for ur doubt
1I ll kill u guyz............
i was sayin dis fr a lon time.................
11No one said u were wrong, Ram. But the central metal ion is the same in both the complexes. So why the colour difference, Pandian?
1now finally acc to me the ans is
exeptions r there in chemistry
11Aragorn........
the colors of the complexes too depend upon the oxidation state of the metal ion.
the color of the complex is due to the splitting of the d-orbital......
and the this splitting increases with increase in the oxidation number of the metal ion......
if now also it is not clear then tell i'll give the full description........
1hey ani... cant give reasons for dat.. dats y its exceptional.............
11Hold on, Sunil. Oxidation state of central metal atom right?
So in both complexes, central metal atom is Fe in +2 state. So why colour change?
33Fe2+ will form another complex with water so there are two complexes in the solution so the color is the sum of two colors due to two different complexes..
[1]
Or see my first page post
Situation is symmetric about Fe, whichever Fe is inside coordination sphere theres no difference, so Might be there actual structure will be different as 3 Fe might be changing there positions ( as it increases entropy so favorable :P) so theres the difference... :P
11No not the central metal ion but the oxidation state of the metal ion outside the coordination sphere.......
Let me explain :-
Like [Cr(H2O)6]2+ and [Cr(H2O)6]3+
both have different colour....
Former has blue colour while the later has violet-blue-gey colour.
Understood......
This all depend upon the oxidation state of the metal ion outside the coordination sphere..
Ur question has the same case.......
11In your example above, the coordination sphere is diff so colour is diff while in my q the coordination sphere is the same but still colour is diff
33Noo
Here Oxdn state of Cr is different..
***Edited***Aragorn and I replied at same time :P