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Mo(CO)6 and Mo(CO)5PPh3 :CO vibrational stretching


How does the CO-vibrational frequency  change when I pass from  Mo(CO)6 to Mo(CO)5PPh3??

PPh3 is a strong sigma the metal has more electron density and  I think the retrodonation on the CO will be greater --> so I think the frequency will decrease.

Can have it sense??

True, substition of CO with PPh3 lowers frequency of remaining C=O about 54 cm-1.


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