Fehco 3 pph 3 2 or cuhpme 3 2 the fe complex is more

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3. (10 pts)Aside from CO, what other ligands mentioned in the big ligand table (Intro 15-20) in your notes can act like -backbonding (or -acceptor) ligands and would have easily monitored IR stretching frequencies (in the 2800-1600 cm1region) that might prove useful as “sensors” for measuring the amount of electron density (or lack thereof) on a transition metal center? [Hint:there are 3 or 4 reasonable choices] Discuss which of these would be the best choice for this and why.

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