kfu Posted March 28, 2009 Share Posted March 28, 2009 Helo How are you ? My question is in the picture attached . Please clarify the answer . Please explain why the answer . Thank you for forum . Link to comment Share on other sites More sharing options...
Tartaglia Posted April 4, 2009 Share Posted April 4, 2009 Associative as NO can reversibly act as a 1e or a 3e donor Link to comment Share on other sites More sharing options...
vedmecum Posted April 15, 2009 Share Posted April 15, 2009 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 . Link to comment Share on other sites More sharing options...
Tartaglia Posted April 15, 2009 Share Posted April 15, 2009 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 Link to comment Share on other sites More sharing options...
vedmecum Posted April 16, 2009 Share Posted April 16, 2009 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 . :-) Link to comment Share on other sites More sharing options...
Tartaglia Posted April 16, 2009 Share Posted April 16, 2009 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 Link to comment Share on other sites More sharing options...
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