In this video i have solved problem from GATE 2017, The Problem seems to be easy but was a bit TRICKY, Watch the video to know how to solve... #LIKE #SHARE and #SUBSCRIBE
To all those who are confused in this question, about strong and weak field donor ligand (specially NH3) Actually, NH3 is a middle field ligand, which is neither a clear strong feild donor nor a weak feild donor, although it behaves as strong feild in most of the cases but there are some exceptions where it will behave as weak feild, Co+2 Octahedral complexes are one of example of it. (Refer to Inorganic Chemistry by James E Huhyee or you can also refer: coordination chemistry by Ajai Kumar) This question was asked in GATE 2017, so if you have doubt with the answer you can check official GATE website.
Niloy, I know many students have confusion in it. Always remember, NH3 behaves as strong feild ligand with Co+3 not with Co+2 There are many exceptions in Coordination Compounds and I'll definitely discuss them in my upcoming videos.
Hello sir, in this question you said NH3 is a weak Ligand thus no pairing due to this, in spectrochemical series NH3 is more towards a region of strong ligands, infact it is placed after 14 weak ligands in the series and after NH3 only 9 strong ligands are there then why it is weak. Kindly tell which ligands would be stronger and cause the formation of low field complexes. Thank you.
It is not like that, in spectrochemical series upto NH3 it is weak feild ligand and after that it is strong feild ligands. Now NH3 is not weak feild in all cases there are certain cases in which it will act as strong feild too. But for this particular question it acts as weak feild ligand. Refer James E Huhyee for standard spectrochemical series.
sir your lecturer is very good i have one doubt about CO(NH3)6 there are diamagnetic, Strong field CO2+ no unpaired electrons in T2g level your answer solve is some variation please clarify
IN OCTAHEDERAL COMPLEX WITH STRONG FIELD LIGAND IN Co +2 ONE ELECTRON FROM 3d ORBITAL IS TRANSFERRED TO 4d ORBITAL AND IT'S HYBRIDISATION BECOMES d2sp3 ....
If ligand would be strong feild like CN it will cause pairing and configuration will be t2g^6 and eg¹ Now calculate CFSE it will be around -1.8(delta)+3P bcoz here 3 electrons are paired and it was caused by ligand that's why
Srivani Vudagandla, Just bcoz you are unaware of this thing, this doesn't mean that the one who is telling about that is wrong. Read some standard books and then comment. If you don't know about it, then NH3 is ligand which is kept at middle of spectrochemical series, due to its sigma donating capability is not very strong, and more importantly, it is neither a pi acceptor non a pi donor. Now it depends on metal centre that how it will behave, here with Co+2 it will behave as weak feild. (Reference: Inorganic Chemistry by James E Huhyee)
I've nowhere mentioned that NH3 is strong feild ligand. Electrons are filled according to Hunds rule and the pairing is taking place bcoz all 5 orbitals are already filled.
All 'Bout Chemistry Sir but in case of strong field NH3 the complex Co(NH3) 6]3+ has six electrons in t2g level which all are paired and no electron left in the eg level Plz clear my concept??
To all those who are confused in this question, about strong and weak field donor ligand (specially NH3)
Actually, NH3 is a middle field ligand, which is neither a clear strong feild donor nor a weak feild donor, although it behaves as strong feild in most of the cases but there are some exceptions where it will behave as weak feild, Co+2 Octahedral complexes are one of example of it. (Refer to Inorganic Chemistry by James E Huhyee or you can also refer: coordination chemistry by Ajai Kumar)
This question was asked in GATE 2017, so if you have doubt with the answer you can check official GATE website.
But nh3 acts as a strong field ligand for cobalt and as a weak field for iron
@@Dsp_126 when the 'Co' ion is in +3 oxidation state ...Then NH3 acts as a strong field ligand ...Not in +2......For the metal complexes of Co .
@@Santupatra_99thanks for the information bro!!
great information
@@Dsp_126 NH3 acts as a WFL in case of Cr+2,Mn+2,Fe+2 & Co+2.
As far as i knew ammonia is a strong field ligand
Niloy, I know many students have confusion in it.
Always remember, NH3 behaves as strong feild ligand with Co+3 not with Co+2
There are many exceptions in Coordination Compounds and I'll definitely discuss them in my upcoming videos.
ammonia act as strong field ligand in cobalt 3 complex only... in cobalt 2 it act as weak field ligand.. exceptional case...
@@AllBoutChemistry sir, will you mention in which book this concept is given...pls..
Chandan Sarmah, Meissler and Tarr.
Also I think it's given in Coordination Chemistry by Ajai Kumar
Not with co+2 ...it's is strong ligand with Co+3
u cleared a big doubt..thank you, ur method to approach questions is beneficial.
Hello sur NH3,CN- is strong field ligand .so pair up electrons..
Sir, in which book this concept is given about pairing energy? Also, NH3 is strong field ligand according to Huhey book, Pg no. 405, Fourth edition,
zabardast concept mila..
thankyou sir
Excellent sir...eye opening...
nh3 strong field legand as per calculation..although it has between character....and form low spin complex....😶
I am short of words to praise u ....so nice plz keep up uploading more n more such a useful videos
thank you.. keep supporting
Hello sir, in this question you said NH3 is a weak Ligand thus no pairing due to this, in spectrochemical series NH3 is more towards a region of strong ligands, infact it is placed after 14 weak ligands in the series and after NH3 only 9 strong ligands are there then why it is weak. Kindly tell which ligands would be stronger and cause the formation of low field complexes. Thank you.
It is not like that, in spectrochemical series upto NH3 it is weak feild ligand and after that it is strong feild ligands. Now NH3 is not weak feild in all cases there are certain cases in which it will act as strong feild too. But for this particular question it acts as weak feild ligand.
Refer James E Huhyee for standard spectrochemical series.
Sir, In G D Tuli, it is given that for d7 ion in HS state, cfse is -8Dq+2P. But you are saying that it was only -8Dq
Sir in this complex ammonia acts as strong field ligand know.
Thank you for posting this video bro🙂🙂🙂
My professor said in strong field ligand first fill all the t2g shell then goes upwards?? I m confused
sir your lecturer is very good i have one doubt about CO(NH3)6 there are diamagnetic, Strong field CO2+ no unpaired electrons in T2g level your answer solve is some variation please clarify
NH3 is weak feild ligand with Co+2
Sir please solve more questions from pairing energy. I get confused here so much 🙁
parveen ahmed, ok sure.. I'll solve more questions on this topics in upcoming videos
All 'Bout Chemistry . Thank you Sir for responding. And please upload sooner as gate exam is too near
Weak field pair up hota hai naa?
Sir NH3 is also a strong field ligand. Isn't it??
Yes this is wrong sir
when CN is present ...the pairing energy 1p or 3p in this case..becuse only one electron is paired up for this ligand
1p
BHAI, try making orbital diagram without splitting you'll notice even after pairing d2sp3 isn't possible sp3d2 is the only configuration left here....
IN OCTAHEDERAL COMPLEX WITH STRONG FIELD LIGAND IN Co +2 ONE ELECTRON FROM 3d ORBITAL IS TRANSFERRED TO 4d ORBITAL AND IT'S HYBRIDISATION BECOMES d2sp3 ....
Very nice sir. I also need organic reaction problems.
there are many problems solved on organic as well.
please watch them too :)
Sir plz make a videos on chemical kinetics especially on chain,parellel, consecutive rxns ND theory's
Alright...
If the ligand is strong field ligand like CN then what is the csfe. Please explain
If ligand would be strong feild like CN it will cause pairing and configuration will be t2g^6 and eg¹
Now calculate CFSE it will be around -1.8(delta)+3P bcoz here 3 electrons are paired and it was caused by ligand that's why
For low spin....
the cfse is = -1.8∆+1P
Because only one electron gets paired due to strong ligand field..
Other two are paired due to hund's rule
In my notes it's written that for fe cu co cd NH3 is strong ligand
Hi! Wonderful video. Though, I have to clarify what the rule is 3:03. :)
Ammonia is strong ligand ????
Ammonia... ia a weak field ligand...
those who said it is strong field ligand... go through the standard book...
NH3 acts as a WFL in case of Cr+2,Mn+2,Fe+2 & Co+2
No it's wrong?!!t2g will fill first as ammonia is stronger ligand so and is 1.8 if with 3p
That's wrong answer. Refer Meissler and Tarr
@@AllBoutChemistry jam tomorrow!! Now I got confused totally
Nice.
Please make magnetism lecture
alright... I'll try
Option D is correct .. apki negtive marking ho gyi ..
Sir upload this type of questions
Srinivasa Rao, watch my other videos, I'm trying to upload as many questions as possible.
Ammonia is a strong field ligand
nice
Ammonia is strong field ligand
Thank you sir
Strong field nh3
-1.8+3p ans aave
Ammonia is sf
Wrong
ammonia is strong field ligand u r confusing the students
Srivani Vudagandla,
Just bcoz you are unaware of this thing, this doesn't mean that the one who is telling about that is wrong. Read some standard books and then comment.
If you don't know about it, then NH3 is ligand which is kept at middle of spectrochemical series, due to its sigma donating capability is not very strong, and more importantly, it is neither a pi acceptor non a pi donor. Now it depends on metal centre that how it will behave, here with Co+2 it will behave as weak feild. (Reference: Inorganic Chemistry by James E Huhyee)
when CO in +2 oxidation state then Nh3 acts as weak field ligand
@@rjfacts2111 that means Co ²+ always shows high spin?...pls explain
NH3 acts as a WFL in case of Cr+2,Mn+2,Fe+2 & Co+2
Sorry to say bro but u r urself confused...
No bro You are wrong
How is it possible as NH3 ligand is strong field ligand so it has pairing energy??
I've nowhere mentioned that NH3 is strong feild ligand. Electrons are filled according to Hunds rule and the pairing is taking place bcoz all 5 orbitals are already filled.
All 'Bout Chemistry
Sir but in case of strong field NH3 the complex Co(NH3) 6]3+ has six electrons in t2g level which all are paired and no electron left in the eg level
Plz clear my concept??
Here Co is in +2 not in +3 so that matters
Nice.
Thank you :)