Cyclopentadienyliron dicarbonyl iodide

Cyclopentadienyliron dicarbonyl iodide is an organoiron compound with the formula (C5H5)Fe(CO)2I. It is a dark brown solid that is soluble in common organic solvents. (C5H5)Fe(CO)2I, or FpI as it is often known, is an intermediate for the preparation of other organoiron compounds such as in ferraboranes.

Cyclopentadienyliron dicarbonyl iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.155.006
EC Number
  • 626-622-8
Properties
C7H5FeIO2
Molar mass 303.864 g·mol−1
Appearance Black crystaline solid (density = 2.374 g/cm3)
Melting point 119 °C (246 °F; 392 K)
Structure
Cs
Hazards
Safety data sheet Here
GHS pictograms
GHS Signal word Warning
H302, H312, H332
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

Preparation

Cyclopentadienyliron dicarbonyl iodide is synthesized by the reaction of cyclopentadienyliron dicarbonyl dimer with I2:[1]

Cp2Fe2(CO)4 + I2 → 2 CpFe(CO)2I

It was first reported by Pauson and Hallam.[2]

Structure

The compound has Cs symmetry, with a mirror plane intersecting one carbon of the Cp ring as well as the iron and iodide centre. The compound adopts a piano stool structure: the cyclopentadienyl ligand is the "seat" and three other ligands are "legs". Such compounds are members of the half-sandwich family of compounds, which is a subgroup of the metallocenes. X-ray crystallography shows the following features: Fe-Cp centroid = 1.72, Fe-I = 2.61, and Fe-CO = 1.78 Å.[3]

Electron counting of this iron(II) complex indicates that (C5H5)Fe(CO)2I is an 18-electron complex: using the neutral method there are 8 electrons from the iron, 5 electrons from the cyclopentadienyl anion, 2 electrons from each of the carbonyls, and 1 electron from the iodide.

References
  1. King, R. B.; Stone, F. G. A "Cyclopentadienyl Metal Carbonyls and some Derivatives" Inorg. Synth. 1963, volume 7, pp. 99-115. doi:10.1002/9780470132388.ch31
  2. B. F. Hallam, P. L. Pauson "Ferrocene Derivatives. Part III. Cyclopentadienyliron Carbonyls" J. Chem. Soc. 1956, pp. 3031-3037.
  3. Zeller, M.; Lazich, E.; Hunter, A. D. (2003). "Dicarbonyl(η5-cyclopentadienyl)iodoiron(II)". Acta Crystallographica Section E. 59: m914–m915. doi:10.1107/S1600536803019950.
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