Give an example of synergistic bonding intera | vedclass

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(D) In metal carbonyls,the metal-carbon bond possesses both $\sigma$ and $\pi$ character. $1$. The $\sigma$ bond is formed by the donation of an elect

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(D) In metal carbonyls,the metal-carbon bond possesses both $\sigma$ and $\pi$ character. $1$. The $\sigma$ bond is formed by the donation of an electron pair from the carbonyl carbon into a vacant orbital of the metal. $2$. The $\pi$ bond is formed by the donation of a pair of electrons from a filled $d$-orbital of the metal into the vacant antibonding $\pi^*$ orbital of the carbon monoxide. $3$. This creates a synergistic effect which strengthens the metal-carbon bond. $4$. All the given complexes,$[Ni(CO)_4]$,$[Fe(CO)_5]$,and $[Cr(CO)_6]$,exhibit this synergistic bonding interaction.

Give an example of synergistic bonding interaction in a carbonyl complex.

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