- CHEM 360 INORGANIC
- Exams and
- Due April 19th, 2001
- 1. Explain why octahedral complexes of
Cr(III) undergo ligand substitution much slower than corresponding
complexes of Fe(III). (15 points)
- 2. The complex
[Fe(ethylenediamine)3]2+ is paramagnetic but
diagmagnetic, why? (10 points).
- 3. Dissolution of Fe(III) perchlorate in
acidic solution (pH = 1) results in a pale violet colored
solution, which changes to an intense yellow-brown color as the pH
is increased to 4 or 5. Explain this observation (15 points).
- 4. You have been provided with a sample of
a supposedly "inert" Cr(III) complex, [Cr(III)L5X].
However, upon addition of a new ligand Y you observe rapid ligand
exchange to form [Cr(III)L5Y]. You find that in
addition to the Cr(III) complex there is a trace of Cr(II) in
solution. Explain why ligand exchange for the octahedral Cr(III)
is rapid. (20 points).
- 5. Why is the trans effect order of ligands
essentially the same as the trans influence for octahedral
complexes, but the series are nearly reversed for square planar
complexes? (10 points).