Problem Solving Approach: Orgel Diagram | Electronic Spectra | Transitions | CSIR-NET | June 2019

This video is a part of Problem Solving series, in this series you will get videos which will just contain solution of problem and how you can approach them.
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[@shyamaleegogoi143]

Sir, please explain how Mn2+ undergoes spin allowed transitions ????

[@sandhyatandale448]

Thank you so much

[@kiransingh1004]

Thanks sir

[@PriyaPriya-se9sf]

Sir How to ni+2 broad band this are not show jahn teller distortion

[@chemmgic2811]

🙏🙏

[@gopalakrishnanr8192]

Ni(2) there is no jhon teller distortion then it will give 3 sharb band, but they are telling 3 broad band, why?

[@abhishekmishra9010]

In the given option, Ni2+ exhibits broad bands but there is no John-Teller distortion in Ni2+ then why option (d) is correct... Plz explain it... It should give 3 sharp bands

[@AllBoutChemistry]

The reason for Broad band in Ni+2 case is the change in symmetry of the molecule upon transition. For ground state Ni+2 we have 6e in t2g and 2e in eg state. Which makes symmetrical electron density along the axes. Now consider first transition from t2g to eg orbital, making 5e in t2g and 3e in eg orbital, thus creating asymmetry in electron density along the axes, thus the symmetry of molecule will be disturbed or distorted which will be depicted in terms of broad peaks.

[@AllBoutChemistry]

Similar explanation can be done for other transitions as well

[@abhishekmishra9010]

Thank u

[@shafnat3262]

@@AllBoutChemistry then the first transition should give a strong band....here all the 3 bands are broad...why so??

[@rudranilghosh2713]

Sir can you make a detailed video on tanabe sugano diagram in youtube /unacademy free /unacademy plus? It'll be helpful for msc purpose.

[@AllBoutChemistry]

Ok Rudranil I will try to make it soon, 👍

[@jamaladyan3487]

Sir aap u academy pe online coaching dete ho for csir

[@AllBoutChemistry]

Yes

[@kundanlal3328]

Sir please make video of physical spectroscopy

[@kundanlal3328]

Please make a video on main Group elements

[@jeerusrinivasarao1173]

Sir I want numerical explanation for jam from all topics and plz help me if you can

[@AllBoutChemistry]

I will try to make videos on that

[@shaileshankalgi1168]

There is no given the complex is tetrahedral or octahedral

[@PriyaPriya-se9sf]

Sir pls explain me

[@Mounikaseshu]

Y Co2+ give only 2 signals but u mention 3 signals in orgel diagram and u didn't explain it also...directly u explained Cr3+ as 3 signals..can u please tell that

[@AllBoutChemistry]

Cr+3 is the one which gives 3 signals and it violates the statement given that's why I just talked about it.

[@Mounikaseshu]

@@AllBoutChemistry y Co2+ give only two signals y not 3

[@AllBoutChemistry]

@@Mounikaseshu in orgel diagram of Co2+ you can see the cross point, where A2g and T1g(P) cross each other, so the transition happens to be from T1g to T2g and T1g to A2g or T1g(P) Due to cross point last two transitions are not descrete and they appears to be same. Giving only two peaks in electronic spectra

[@Mounikaseshu]

@@AllBoutChemistry tq sir

[@rameshk9271]

@@Mounikaseshu Co+2 is d7 complex.. It has 5e in t2g and 2e in eg. In this only 2 transition are spin allowed 3rd transition will be spin forbidden

[@brijesh_shah]

Thanks sir