Course 21J - Inorganic Reaction Mechanisms

Problem Paper # 4

November 10, 2003

For each of the following metal and ligand combinations, formulate the simplest neutral compound that conforms to the 18-electron rule.
Draw a reasonable structure for each compound.

(a) Ni, CO; (b) Fe, CO, COT (COT = cyclooctatraene);

(c) Co, Cp, CO; (d) Fe, Cp, CO;

(e) Ni, Cp, NO; (f) Co, Cp, NO.

2. Predict the structures of the following complexes:

(a) Ni(CO)4 ; (b) (PEt3)2Pd(CH3)2 ;

(c) Fe(CO)4(C2H4) ; (d) PdCl2(CH3CN)2 ;

(e) Rh(PPh3)3Cl ; (f) [Co(CO)4]-

3. Which of the two complexes has the lower CO stretching frequency in the infrared spectrum? Rationalise your choice.

(a) Mo(CO)6 or Mo(CO)4(PPh3)2

(b) Cr(CO)6 or Cr(dien)(CO)3

(c) Fe(CO)5 or Fe(CO)4Br2

(d) Mo(CO)4(PMe3)2 or Mo(CO)4(PPh3)2

4. Outline preparative methods for the following metal carbonyls:

Ni(CO)4; Fe(CO)5; Co2(CO)8; Mo(CO)6; Ru(CO)5.

5. What is reductive carbonylation? Give an example where this method is applied to prepare a metal carbonyl.

6. Draw catalytic cycles for hydrogenation of olefins and Pd-catalyzed oxidation of alkenes.

Copyright © 2003 by Tara Dasgupta, all rights reserved.

Maintained by Prof. Robert J. Lancashire,
The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created November 2003. Links checked and/or last modified 16th November 2003.