1Plz anyone tell howz this.......
Thats tooooo interesting
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
1wel i think K is in +1 state while in d other cmp, Fe is in +2 state........tht may giv sum clue......... with d number of unpaired electrons.........
11But it's only what's inside the coordination sphere that's supposed to determine colour of the complex. So what will explain this?
11macchan, whatever config Fe has, IT IS NOT INSIDE COORDINATION SPHERE. So how will it affect?
33See color arises due to d electrons...
Thats why [Al(H2O)6]3+ is colorless whereas [Ni(H2O)6]3+ is green...
The coordination entities only raises energies of d orbitals and that too to different extents so due to difference in energies of d orbitals due to so called splitting of d orbitals when d electron jumps from one d orbital to other it absorbs some color so imparting color...
:)
1dats k.. abishek.. wats d solution fr d question asked???
11in d example u mentioned,Abhishek, changes happen inside d coord. sphere. In d question, changes r happening outside it.
33A non chemistry explanation...
:P
in second there is Iron so 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...
And if not so then there will be a specific chemistry explanation, (a new exception theory)... explaining another exception
11:D
Only, i din' understand a word of ur explanation. But that's how it's supposed 2 b isn't it? ;)
33Yeah this can be true...
Thats what is there in resonating structures- situation is not changed when electron is with one or other ..yeah but thats with a name....
1lets all together raise hands to praise chemistry....ha ha ha ...
1K+ are usually colourless while Fe2+ are green coloured. Now in solution,
in first case - K+ and [Fe(CN)6]4- are given out. the complex has a specific colour while K+ doesn't.
In case of Fe2+ and [Fe(CN)6]4-, Fe 2+ has some colour and the complex also has some colour. So there is some difference in colour.
:P I don't know :P
33hey is "anhydrous" Fe2+ colored
but! gud! Fe2+ might be forming a complex wid water to form another color and resulting color is the vector sum of the two colors..
11First compund has 1 F while the other has 2 F's. therefore more colour!
P.S : F -> Farbe -> "Colour" in German ;)
1hey aragorn..........tht joke was extremely dumb..........hehe dnt worry my ans is correct i guess.......hehe
11Thanx, Akand !
What was that abt stability of complexes, Ram? I didn't get you.
1wat stability ramku??????????????????? CHELATING ligands???????hehehehehehehe
11BUT THE COORDINATION SPHERE REMAINS UNCHANGED. So if there is charge transfer, there will b charge transfer in both cases and so u should get the same colour. But why is it not so?
1here's something I think might help in the discussion .
http://en.wikipedia.org/wiki/Charge_transfer_complex
b/w good question .thank you.
11I didn't know ligands had interactions with counter ions as well. Won't the ligand's activity be limited within the coordination sphere?
P.S: What is b/w ?
11Hellllllllllllllllllloooooooooooooooooooo?
Anyone reply pleeeeeeeeeeeeeease. :_(
