The bond length of C-O bond in CO is 1.128 m | vedclass

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Question

(A) In metal carbonyls like $Fe(CO)_5$,the metal-carbon bond involves synergic bonding.
This involves the donation of electron density from the $CO$

Vedclass · Accepted Answer

$1.158$

Vedclass · Answer

(A) In metal carbonyls like $Fe(CO)_5$,the metal-carbon bond involves synergic bonding.
This involves the donation of electron density from the $CO$ lone pair to the metal $d$-orbitals ($\sigma$-donation) and the back-donation of electron density from the metal $d$-orbitals to the empty antibonding $\pi^*$ orbitals of $CO$ ($\pi$-backbonding).
This back-donation increases the electron density in the antibonding $\pi^*$ orbital of $CO$,which decreases the bond order of the $C-O$ bond.
$A$ decrease in bond order leads to an increase in the $C-O$ bond length.
Therefore,the $C-O$ bond length in $Fe(CO)_5$ $(1.158 \ \mathring{A})$ is greater than that in free $CO$ $(1.128 \ \mathring{A})$.

The bond length of $C-O$ bond in $CO$ is $1.128 \ \mathring{A}$. The $C-O$ bond length in $Fe(CO)_5$ is ................ $\mathring{A}$.

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