1. Mo(pyr)2(CO)4 (pyr = pyridine) has two isomers. Predict the number of IR allowed CO stretching vibrations for each isomer. Based on this, would IR spectroscopy be a useful method to distinguish the two isomers? Why or why not?
2. CoCl2 reacts with DMSO to give the compound [Co(DMSO)6][CoCl4], which is dark blue and has a magnetic moment of 4.6 μB. Account for the color and magnetic moment. Does the O or the S bond to the cobalt? Use a Lewis structure to justify your answer.
3. One synthetic method to prepare substituted chromium carbonyl complexes is photochemical:
Cr(CO)6 + L + hν → Cr(CO)5L + CO
Explain why this is an effective synthetic method using an appropriate bonding theory.
4. [Cr(ox)3]3– has an absorption spectrum with the following bands and molar absorption coefficients:
Find 10Dq and B. Hint: Be sure your response is consistent with the Tanabe-Sugano diagram.