IGNOU BCHET 147 2026 - Explain the structure of Fe2(CO)9 based on valence bond app

Question

Explain the structure of Fe₂(CO)₉ based on valence bond approach.

10 Jan 2026

Answer :

Word Count : 283

The structure of Fe₂(CO)₉ can be rationalized using the valence bond (VB) approach by considering the bonding interactions between the iron atoms and carbonyl ligands. Fe₂(CO)₉ is a binuclear iron carbonyl complex where each iron atom is in the zero oxidation state (Fe⁰), having an electronic configuration of [Ar] 3d⁶ 4s². In the valence bond description, each iron atom undergoes sp³d² hybridization to accommodate six electron pairs, forming bonds with CO ligands and bridging interactions with the other iron atom. In Fe₂(CO)₉, there are three bridging CO ligands connecting the two iron atoms and three terminal CO ligands attached to each iron. The bridging CO ligands are symmetrically shared, forming

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