{"document_url": "https://en.wikipedia.org/wiki/Bis(fulvalene)diiron"}
Chemical compound

Bis(fulvalene)diiron is the organoiron complex with the formula (C5H4-C5H4)2Fe2. Structurally, the molecule consists of two ferrous centers sandwiched between fulvalene dianions. The compound is an orange solid with lower solubility in benzene than ferrocene. Its structure has been verified by X-ray crystallography. The compound has attracted some interest for its redox properties.

Preparation

It was first prepared by Ullmann coupling of 1,1'-diiodoferrocene using copper but subsequent work produces the complex is 20-40% yield from dilithiofulvalene and ferrous chloride:

2 (C5H4Li)2 + 2 FeCl2 → (C5H4-C5H4)2Fe2 + 4 LiCl

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