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Shweta Thakur posted an Question
June 02, 2021 • 23:01 pm
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30 points
30 points
- IIT JAM
- Chemistry (CY)
Plz explain metallocenes... aromatic (5) homoaromatic compounds: compounds that con
N H Pyrrol Furan Thiophene (4) Metallocenes: C Fe CO Co Cco (Ferrocene) Aromatic Benzenetricarbonylchror Aromatic (5) Homoaromatic Compounds: Compounds that contain one matic compounds and aromaticity of these compoOund
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Priyanshu kumar![best-answer]()
The iron center in ferrocene is usually assigned to the +2 oxidation state, consistent with measurements using Mössbauer spectroscopy. Each cyclopentadienyl (Cp) ring is then allocated a single negative charge, bringing the number of π-electrons on each ring to six, and thus making them aromatic. These twelve electrons (six from each ring) are then shared with the metal via covalent bonding. When combined with the six d-electrons on Fe2+, the complex attains an 18-electron configuration. Other explanation:- let us first consider why cyclopentadienyl anion is aromatic. This is negatively charged, and it has SIX ππ electrons constrained in a ring…and thus it meets the Huckel criterion for aromaticity…and bound to an iron(II) centre as a sandwich or half-sandwich, it retains this aromaticity, such that ferrocene can undergo some reactions (for instance acetylation) that are consistent with that of an aromatic ring.