Question

Give an example of a transition metal-dinitrogen complex. Give suitable chemical equation for
its preparation. In what fashion can the two metal atoms be bridged by dinitrogen? What
happens when the dinitrogen ligands bind in side-on mode? Gives suitable diagrams.

13 Aug 2026
Answer :
Word Count : 539
The bonding in metal carbonyls is best explained by the synergic bonding model, in which both σ-donation from carbon monoxide (CO) to the metal and π-back donation from the metal to CO occur simultaneously. These two interactions reinforce each other and produce a strong metal–carbon bond. This type of bonding is characteristic of complexes such as Ni(CO)₄, Fe(CO)₅ and Cr(CO)₆. Carbon monoxide is a neutral ligand having a carbon atom with a lone pair of electrons. The highest occupied molecular orbital (HOMO) of CO is largely concentrated on the carbon atom and can donate its electron pair to an empty orbital of the metal. This interaction is called σ-donation. ```text σ donation CO :C≡O ─────────→ M lone pair empty metal orbital ``` The carbon atom of CO approaches the metal through its lone pair, forming
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