Dichlorotetrakis(pyridine)iron(II)

Dichlorotetrakis(pyridine)iron(II)
Names
	Other names Tetra(pyridine)iron dichloride
Identifiers
CAS Number	15138-92-8 monohydrate;
3D model (JSmol)	Interactive image;
ChemSpider	21169983;
PubChem CID	15809771;
	InChI InChI=1S/4C5H5N.2ClH.Fe/c41-2-4-6-5-3-1;;;/h41-5H;2*1H;/q;;;;;;+2/p-2 Key: KVQSAWIBLUAVAB-UHFFFAOYSA-L;
	SMILES C1=CC=NC=C1.C1=CC=NC=C1.C1=CC=NC=C1.C1=CC=NC=C1.Cl[Fe]Cl;
Properties
Chemical formula	C20H20Cl2FeN4
Molar mass	443.15 g·mol−1
Appearance	yellow solid
Density	1.351 g/cm3
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Dichlorotetrakis(pyridine)iron(II) is the coordination complex with the formula FeCl₂(pyridine)₄. A yellow solid, it is a prominent example of a transition metal pyridine complex. It is used as an anhydrous precursor to other iron complexes and catalysts.^[1] According to X-ray crystallography, the chloride ligands are mutually trans. The complex has a high spin configuration. A monohydrate as well as several related complexes are known, e.g. CoCl₂(pyridine)₄ and NiCl₂(pyridine)₄.^[2] It is prepared by treating ferrous chloride with an excess of pyridine.^[3]

References

^ Wu, Jessica Y.; Stanzl, Benjamin N.; Ritter, Tobias (2010). "A Strategy for the Synthesis of Well-Defined Iron Catalysts and Application to Regioselective Diene Hydrosilylation". Journal of the American Chemical Society. 132 (38): 13214–13216. doi:10.1021/ja106853y. PMID 20809631.
^ Long, Gary J.; Clarke, Peter J. (1978). "Crystal and molecular structures of trans-tetrakis(pyridine)dichloroiron(II), -nickel(II), and -cobalt(II) and trans-tetrakis(pyridine)dichloroiron(II) monohydrate". Inorganic Chemistry. 17 (6): 1394–1401. doi:10.1021/ic50184a002.
^ Baudisch, Oskar; Hartung, Walter H. (1939). "Tetrapyridino-Ferrous Chloride (Yellow Salt)". Inorganic Syntheses. 1: 184–185. doi:10.1002/9780470132326.ch64.

[1] Wu, Jessica Y.; Stanzl, Benjamin N.; Ritter, Tobias (2010). "A Strategy for the Synthesis of Well-Defined Iron Catalysts and Application to Regioselective Diene Hydrosilylation". Journal of the American Chemical Society. 132 (38): 13214–13216. doi:10.1021/ja106853y. PMID 20809631.

[2] Long, Gary J.; Clarke, Peter J. (1978). "Crystal and molecular structures of trans-tetrakis(pyridine)dichloroiron(II), -nickel(II), and -cobalt(II) and trans-tetrakis(pyridine)dichloroiron(II) monohydrate". Inorganic Chemistry. 17 (6): 1394–1401. doi:10.1021/ic50184a002.

[3] Baudisch, Oskar; Hartung, Walter H. (1939). "Tetrapyridino-Ferrous Chloride (Yellow Salt)". Inorganic Syntheses. 1: 184–185. doi:10.1002/9780470132326.ch64.

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