Question 4. Draw a simple molecular orbital diagram for the carbon monoxide (CO) molecule and explain, using...

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Chemistry

Question 4.

  1. Draw a simple molecular orbital diagram for the carbon monoxide(CO) molecule and explain, using an accurate bonding description,how this molecule can act as a ligand within metal carbonylcompounds.
  2. Explain why CO possesses one infrared (IR) active vibrationalmode u(CO), whereas, the di-nitrogen molecule,N2, does not?
  3. Using your bonding description from part (i.),together with the knowledge that CO ligands contain an IR activevibrational mode, explain the variations in u(CO)cm-1 values which arise for the following isoelectroniccomplexes:

Compound

u(CO) cm-1

[V(CO)6]-

1860

Cr(CO)6

2000

[Mn(CO)6]+

2095

CO (uncoordinated)

2143

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