Also called dicyclopentadienyl iron [(C5H5)2Fe),
an orange crystalline organo-iron compound. It is a typical, stable sandwich
compound – the first to be prepared (1951) – consisting
of an iron (II) ion sandwiched between two five-member carbon rings. The
molecular structure is a pentagonal antiprism.
Melting point 174°C, sublimation 100°C.