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Appearance Black crystaline solid (density = 2.374 g/cm3) | ||
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.
Contents
Preparation
Cyclopentadienyliron dicarbonyl iodide is synthesized by the reaction of cyclopentadienyliron dicarbonyl dimer with I2:
Cp2Fe2(CO)4 + I2 → 2 CpFe(CO)2IIt was first reported by Paulson and Hallam.
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.
Electron counting of this ferrous complex indicates 6 electrons from the cyclopentadienyl anion, 2 electron from each of the carbonyls, and 2 electrons from the iodide.