Ferrocene

Properties

General
Discovered	1951
Systematic	bis(η5 -cyclopentadienyl )iron(II)
Name	Ferrocene, iron cyclopentadienyl
Chemical formula	Fe(C5H5)2
Data
Formula weight	186,04 amu
Melting point	174–176°C (? K)
Boiling point	249°C (? K)
Density	1,490 g/m3 (20°C)
Crystal structure	?
Solubility	insoluble
Thermochemistry
ΔfH0gas
ΔfH0liquid
ΔfH0solid
S0solid
Safety
Ingestion	?
Inhalation	?
Skin	?
Eyes	?
More info	Hazardous Chemical Database

Ferrocene Fe(C₅H₅)₂ is the prototypical metallocene, a type of organometallic chemical compound, consisting of two cyclopentadienyl rings bound on opposite sides of a central iron atom and forming an organometallic sandwich compound .

It was first made unintentionally from the reaction of cyclopentadiene and iron powder in the 1950s, originally designed to couple the diene. Instead a lightly orange powder was obtained. The structure was confirmed by NMR. Discovery of its structure led to an explosion of interest in d-block metal carbon bonds and brought about development and the now flourishing study of organometallic chemistry.

In ferrocene, the pi electrons of both the aromatic cyclopentadienyl rings are shared with the central iron ion, giving it an inert gas electron configuration. This makes ferrocene particularly stable.

Ferrocene finds practical application as a catalyst in the making of ultra-high molecular weight polyethylene. This material is a new alternative to aramid, both can be used to make fibres for bulletproof clothing.