inorganic reaction mechanisms ???

[kfu]

Helo

 

How are you ?

 

My question is in the picture attached .

 

Please clarify the answer .

 

Please explain why the answer .

 

Thank you for forum .

[Tartaglia]

Associative as NO can reversibly act as a 1e or a 3e donor

[vedmecum]

i don't know correct ans . but acc. to me its n't because of NO but due to formation of pentavalent ( sp3d hybridization ) transition state (as in your case) which acc. to Werner theory is highly unstable so complex again get its tetravalent state .

[Tartaglia]

Unfortunately Vedmecum, it is indeed due to the reversible 1e (bent ) NO and 3e (linear) NO interconversion. There are a number of other ligands which show similar effects eg the indenyl ligand which can flip eta-3 to eta-5. The complexes above are coordinatively unsaturated, the 1e (bent) NO configuration makes them electronically unsaturated 16e species, which then exhibit very low activation energy associative ligand substitution mechanisms

[vedmecum]

Tartaglia ,may be your ans. is correct to some extent but mine guess was also correct , you can verify it from the following links:-

 

1. http://www.chemguide.co.uk/inorganic/complexions/ligandexch.html

2. http://www.britannica.com/EBchecked/topic/136410/coordination-compound/277812/Substitution#ref=ref1008332

3. pages 706-710 http://books.google.com/books?id=ocKWuxOur-kC&pg=PA701&lpg=PA701&dq=substition+reaction+in+inorganic+chemistry&source=bl&ots=M7v4IiixEZ&sig=BaCbUwt8vT5_f6C5JEwlTC-PG7o&hl=en&ei=5t_mSbTWLsuHkQXy6pWbBw&sa=X&oi=book_result&ct=result&resnum=9#PPA711,M1 . :-)

[Tartaglia]

Vedmecum, The point of the question is the 1e/3e interconversion of the NO ligand. This is a rather common undegraduate organometallic chemistry exam question