Wikipedia
Bis(cyclooctatetraene)iron
Bis(cyclooctatetraene)iron is an organoiron compound with the formula Fe(CH), abbreviated Fe(COT). It is an air-sensitive black solid that is soluble in diethyl ether and aromatic solvents. The compound decomposes in solution after a few days even under inert atmosphere. It has no known practical applications but has been studied as a soluble source of Fe(0).