Does Back-Donation Decrease Down the Column for Cr(CO)6, Fe(CO)5, and Ni(CO)4?

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The discussion centers on the concept of back-donation in metal carbonyl complexes, specifically Cr(CO)6, Fe(CO)5, and Ni(CO)4. Participants clarify that back-donation refers to the transfer of electron density from the metal to the CO ligand, not the reverse. There is confusion regarding the comparison of back-donation across these complexes, as they are not isoelectronic and have different coordination numbers (CNs). The conversation emphasizes the need to determine whether to analyze back-bonding on a per ligand basis or per complex, highlighting the complexity of comparing back-donation in these metal carbonyls.
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Cr(CO)6
Fe(CO)5
Ni(CO)4

Is there more back-donation (from the CO) going up OR down the above column? I always get this mixed up.
 
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Back donation is from the metal back to the ligand, not the other way as you have indicated ("from the CO").

These compounds are not isoelectronic and have different CN's. How do you want to compare the backbonding? Per ligand or per complex?
 

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