Cyclopentadienyliron dicarbonyl dimer

Cyclopentadienyliron dicarbonyl dimer is an organometallic compound with the formula [(η5-C5H5)Fe(CO)2]2, often abbreviated to Cp2Fe2(CO)4, [CpFe(CO)2]2 or even Fp2, with the colloquial name "fip dimer". It is a dark reddish-purple crystalline solid, which is readily soluble in moderately polar organic solvents such as chloroform and pyridine, but less soluble in carbon tetrachloride and carbon disulfide. Cp2Fe2(CO)4 is insoluble in but stable toward water. Cp2Fe2(CO)4 is reasonably stable to storage under air and serves as a convenient starting material for accessing other Fp (CpFe(CO)2) derivatives (described below).

Cyclopentadienyliron dicarbonyl dimer
Names
IUPAC name
Di-μ-carbonyldicarbonylbis(η5-cyclopenta-2,4-dien-1-yl)diiron
Other names
Bis(cyclopentadienyl)tetracarbonyl-diiron,
Di(cyclopentadienyl)tetracarbonyl-diiron,
Bis(dicarbonylcyclopentadienyliron)
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.032.057
EC Number
  • 235-276-3
PubChem CID
  • InChI=1S/2C5H5.4CO.2Fe/c2*1-2-4-5-3-1;4*1-2;;/h2*1-5H;;;;;;/q;;;;2*-1;2*+1 Y
    Key: XJSJEKXJJGHIGW-UHFFFAOYSA-N Y
  • InChI=1/2C5H5.4CO.2Fe/c2*1-2-4-5-3-1;4*1-2;;/h2*1-5H;;;;;;/q;;;;2*-1;2*+1/r2C6H5FeO.2CO/c2*8-5-7-6-3-1-2-4-6;2*1-2/h2*1-4,6H;;
    Key: XJSJEKXJJGHIGW-FEMRPSMKAV
SMILES
  • [C-]#[O+].[C-]#[O+].c1ccc[cH-]1.[Fe+][C-]=O.c1ccc[cH-]1.[Fe+][C-]=O
Properties
C14H10Fe2O4
Molar mass 353.925 g/mol
Appearance Dark purple crystals
Density 1.77 g/cm3, solid
Melting point 194 °C (381 °F; 467 K)
Boiling point decomposition
insoluble
Solubility in other solvents benzene, THF, chlorocarbons
Structure
distorted octahedral
3.1 D (benzene solution)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 CO source
GHS labelling:
Danger
H228, H302, H330, H331
Related compounds
Related compounds
 Fe(C5H5)2
Fe(CO)5
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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