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

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

PPh3 is a strong sigma donor...so 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??
Thanks

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

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