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Chemistry doubt!

I Have got a problem.

The complex [FeF6]3- Does not have any color while [CoF6]3- Has a color.

Why? .

From theory in both the complexes d-d transition is possible

Note by Prakhar Bindal
1 week, 4 days ago

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exceptional case !!! Despite of five unpaired electrons the complex is coulourless. It is explained in terms of extra stability of half filled configuration due to which energy involved in electronic transiition is having shorter wavelength then the visible spectrum. Pawan Pal · 1 week, 4 days ago

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@Pawan Pal Ohh . do you know more exceptions? Prakhar Bindal · 1 week, 4 days ago

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let me give my explanation too ....High spin Fe3+ is likely with a weak field ligand like F-so this is a high spin d5 ion and no d→d transitions are possible from the 6 S ground state because there are no other sextet states possible. In the case of Co3+, this is a high spin d6 ion and the 4 D ground state is split into 4 Eg and 4 T2g states by the Oh crystal field. The only spin allowed transition will be between these states Shubham Dhull · 1 week, 3 days ago

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@Shubham Dhull i do not know how to write sub-script or superscript ! Shubham Dhull · 1 week, 3 days ago

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d-d transition in [FeF6]3- are spin only and quite weak making it almost colorless. however in [CoF6]3- d-d transition from t2g to eg falls under visible region giving it a consistent blue color. Ayush Agarwal · 1 week, 3 days ago

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@Ayush Agarwal Yep that can be explained. but..

We mostly see colors by charge transfer and dd transition. we never see that the transitions are quite weak or so. but yeah i know it must be an exceptional case.

And neverthless thanks for answering and BTW how much are you getting in the AITS? Prakhar Bindal · 1 week, 3 days ago

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@Prakhar Bindal Well. This one didn't go well. No ideas why i performed so bad. What's your rank ? Ayush Agarwal · 1 week, 2 days ago

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@Ayush Agarwal Mine is bad too bad. in mains its 34 dont ask advanced.

what about you? And whats highest rank at your centre Prakhar Bindal · 1 week, 2 days ago

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@Prakhar Bindal nothing is exceptional , everything can be explained ! which rank u got in the aits occured on 13 th nov. ? in mine i got 43rd rank (out of 3034 ) ! :) Shubham Dhull · 1 week, 3 days ago

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@Shubham Dhull @Prakhar Bindal Shubham Dhull · 1 week, 3 days ago

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tune mujhe tag nahi kiya ! :( Shubham Dhull · 1 week, 3 days ago

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@Shubham Dhull bhul gya tha :P Prakhar Bindal · 1 week, 3 days ago

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@Prakhar Bindal K, let it go . i know i am stupid ! by the way best of luck for NSEP ! Shubham Dhull · 1 week, 3 days ago

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@Shubham Dhull Thanks and you aren't stupid! Prakhar Bindal · 1 week, 3 days ago

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@Prakhar Bindal Abhi coordination chal raha hai Prince Loomba · 1 week, 4 days ago

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@Prince Loomba Friday tak khatam hoga, And maybe this will be studied in d block Prince Loomba · 1 week, 4 days ago

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@Prince Loomba K. go on! Prakhar Bindal · 1 week, 4 days ago

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