C21J Tutorial Paper (Organometallic Chemistry)

1. In order to have a vanadium carbonyl that satisfies the noble gas formalism, what would be the simplest formula? Why do you think this fails to occur?

2. Write balanced equations for the following reactions:

(a) Mo(CO)6 - is refluxed with KI in THF
(b) Ni(CO)4 - is treated with PCl3

3. Determine whether or not the following compounds obey the 18-electron rule:
(a)H2Fe(CO)4
(b)Mn2(I)2(CO)8
(c)HMn(CO)4

4. Explain the relative position of the IR stretching absorptions in [V(CO)6]- versus Cr(CO)6.

5. Write the formulas for the mononuclear metal carbonyl molecules formed by V, Cr, Fe, and Ni. Which ones satisfy the noble gas formalism?

6. Why are the simplest carbonyls of the metals Mn, Tc, Re and Co, Rh, Ir groups polynuclear?

7.  Draw the structures of Fe2(CO)9, and Ru3(CO)12 and Rh4(CO)12.

8. Which are the only to metals to react directly with CO under conditions suitable for practical syntheses?

9. How are the following compounds made? What are their principal physical characteristics?
(a)Fe(CO)5
(b)Co2(CO)8
(c)Mn2(CO)10

10. Explain why Mo(py)2(CO)4 has two forms, one having a single CO stretching band in the IR spectrum, the other four.

11.  Discuss the similarities and differences between CN- and CO as ligands.
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