Iron tetracarbonyl diiodide

Iron tetracarbonyl diiodide
Identifiers
CAS Number	14911-55-8;
3D model (JSmol)	Interactive image;
ChemSpider	452752;
PubChem CID	519026;
	InChI InChI=1S/4CO.Fe.2HI/c41-2;;;/h;;;;;21H/q;;;;+2;;/p-2 Key: BNIJVXICMSDYLX-UHFFFAOYSA-L;
	SMILES [C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[Fe](I)I;
Properties
Chemical formula	C4FeI2O4
Molar mass	421.694 g·mol−1
Appearance	black solid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Iron tetracarbonyl diiodide is the inorganic compound with the formula FeI₂(CO)₄. The molecule features four carbonyl ligands and two iodides. It is a low-spin complex of ferrous iron. As confirmed by X-ray crystallography, the compound has cis stereochemistry.^[1] It is a black solid that is soluble in dichloromethane and related organic solvents.

Preparation and reactions

It is prepared by the reaction of molecular iodine with iron pentacarbonyl, following a procedure first reported by Hieber and Wirschung in 1940:^[2]

Fe(CO)₅ + I₂ → FeI₂(CO)₄ + CO

Iron tetracarbonyl diiodide reacts with a variety of Lewis bases with displacement of one or two CO ligands. The corresponding dibromide is even more reactive toward Lewis bases.^[3]^[4]

References

^ Yu. V. Torubayev, A. A. Pasynskii, P. Mathur (2008). Koordinatsionnaya Khimiya. 34: 812–816. {{cite journal}}: Missing or empty |title= (help)CS1 maint: multiple names: authors list (link)
^ Hieber, W.; Wirsching, A. (1940). "Über Metallcarbonyle. XXXII. Über Eisencarbonylhalogenide". Z. Anorg. Allg. Chem. 245: 35-58. doi:10.1002/zaac.19402450108.
^ Libbey, Edward T.; Bancroft, G. Michael (1974). "Trimethyl Phosphite Complexes of Iron(II): Preparation, Characterisation, and Mössbauer Spectra". J. Chem. Soc., Dalton Trans: 87–92. doi:10.1039/DT9740000087.
^ Li, Bin; Liu, Tianbiao; Popescu, Codrina V.; Bilko, Andrey; Darensbourg, Marcetta Y. (2009). "Synthesis and Mössbauer Characterization of Octahedral Iron(II) Carbonyl Complexes FeI₂(CO)₃L and FeI₂(CO)₂L₂: Developing Models of the [Fe]-H₂ase Active Site". Inorg. Chem. 48 (23): 11283–11289. doi:10.1021/ic9017882. PMID 19860458.

[1] Yu. V. Torubayev, A. A. Pasynskii, P. Mathur (2008). Koordinatsionnaya Khimiya. 34: 812–816. {{cite journal}}: Missing or empty |title= (help)CS1 maint: multiple names: authors list (link)

[2] Hieber, W.; Wirsching, A. (1940). "Über Metallcarbonyle. XXXII. Über Eisencarbonylhalogenide". Z. Anorg. Allg. Chem. 245: 35-58. doi:10.1002/zaac.19402450108.

[3] Libbey, Edward T.; Bancroft, G. Michael (1974). "Trimethyl Phosphite Complexes of Iron(II): Preparation, Characterisation, and Mössbauer Spectra". J. Chem. Soc., Dalton Trans: 87–92. doi:10.1039/DT9740000087.

[4] Li, Bin; Liu, Tianbiao; Popescu, Codrina V.; Bilko, Andrey; Darensbourg, Marcetta Y. (2009). "Synthesis and Mössbauer Characterization of Octahedral Iron(II) Carbonyl Complexes FeI₂(CO)₃L and FeI₂(CO)₂L₂: Developing Models of the [Fe]-H₂ase Active Site". Inorg. Chem. 48 (23): 11283–11289. doi:10.1021/ic9017882. PMID 19860458.

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