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In the formation of metal carbonyls, whi...

In the formation of metal carbonyls, which orbitals are involved in the overlap ?

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(i) Filled bonding `pi_(2p)` orbital of CO with empty metal d-orbital resulting in `sigma`-bond between metal atom and carbon atom of CO.
(ii) Filled metal d-orbital with empty antibonding `pi_(2p)*` orbital of CO resulting in additional `pi`-bond between the metal and same CO molecule (back bonding).
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