View source for Chemistry:Dichlorotetrakis(pyridine)iron(II)

{{Chembox
| ImageFile = FeCl2py4.png
| ImageSize = 
| ImageAlt = 
| IUPACName = 
| OtherNames = Tetra(pyridine)iron dichloride
|Section1={{Chembox Identifiers
| CASNo = 15138-92-8
| CASNo2 = 
| CASNo_Comment = monohydrate
| PubChem = 15809771
| ChemSpiderID = 21169983
| StdInChI=1S/4C5H5N.2ClH.Fe/c4*1-2-4-6-5-3-1;;;/h4*1-5H;2*1H;/q;;;;;;+2/p-2
| StdInChIKey = KVQSAWIBLUAVAB-UHFFFAOYSA-L
| SMILES = C1=CC=NC=C1.C1=CC=NC=C1.C1=CC=NC=C1.C1=CC=NC=C1.Cl[Fe]Cl
 }}
|Section2={{Chembox Properties
| C=20|N=4|H=20|Fe=1|Cl=2
| MolarMass =
| Appearance = yellow solid
| Density = 1.351 g/cm<sup>3</sup>
| MeltingPt = 
| BoilingPt = 
| Solubility = }}
|Section3={{Chembox Hazards
| GHSPictograms = {{GHS07}}
| GHSSignalWord = Warning
| HPhrases = {{H-phrases|315|319|335}}
| PPhrases = {{P-phrases|261|264|271|280|302+352|304+340|305+351+338|312|321|332+313|337+313|362|403+233|405|501}}
| MainHazards = 
| FlashPt = 
| AutoignitionPt = }}
}}
'''Dichlorotetrakis(pyridine)iron(II)''' is the [[Chemistry:Coordination complex|coordination complex]] with the formula FeCl<sub>2</sub>(pyridine)<sub>4</sub>.  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 [[Chemistry:Catalyst|catalyst]]s.<ref>{{cite journal |doi=10.1021/ja106853y|title=A Strategy for the Synthesis of Well-Defined Iron Catalysts and Application to Regioselective Diene Hydrosilylation|year=2010|last1=Wu|first1=Jessica Y.|last2=Stanzl|first2=Benjamin N.|last3=Ritter|first3=Tobias|journal=Journal of the American Chemical Society|volume=132|issue=38|pages=13214–13216|pmid=20809631}}</ref> According to [[Physics:X-ray crystallography|X-ray crystallography]], the chloride [[Chemistry:Ligand|ligand]]s are mutually trans. The complex has a high spin configuration.  A monohydrate as well as several related complexes are known, e.g. CoCl<sub>2</sub>(pyridine)<sub>4</sub> and NiCl<sub>2</sub>(pyridine)<sub>4</sub>.<ref>{{cite journal |doi=10.1021/ic50184a002|title=Crystal and molecular structures of trans-tetrakis(pyridine)dichloroiron(II), -nickel(II), and -cobalt(II) and trans-tetrakis(pyridine)dichloroiron(II) monohydrate|year=1978|last1=Long|first1=Gary J.|last2=Clarke|first2=Peter J.|journal=Inorganic Chemistry|volume=17|issue=6|pages=1394–1401}}</ref>  It is prepared by treating ferrous chloride with an excess of [[Chemistry:Pyridine|pyridine]].<ref>{{cite journal |doi=10.1002/9780470132326.ch64|title=Tetrapyridino-Ferrous Chloride (Yellow Salt)|journal=Inorganic Syntheses|year=1939|last1=Baudisch|first1=Oskar|last2=Hartung|first2=Walter H.|pages=184–185|volume=1}}</ref>

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{{Table|formula|CAS RN|density|other|class=}}
TiCl<sub>2</sub>(pyridine)<sub>4</sub>

1.383<ref>{{cite journal |doi=0.1021/acs.inorgchem.5b01796}}</ref>
VCl<sub>2</sub>(pyridine)<sub>4</sub> Cryst.Struct.Commun. D.J.Brauer, C.Kruger 1973 421 vol 2
1.346
Cr acetone solvate
1.383<ref>{{cite journal |doi=10.1016/0020-1693(95)90041-4}}</ref>

MnCl<sub>2</sub>(pyridine)<sub>4</sub><ref>{{cite journal |doi=10.1021/ic00126a009}}</ref>
1.361

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==References==
<references />

[[Category:Iron(II) compounds]]
[[Category:Iron complexes]]
[[Category:Chloro complexes]]
[[Category:Pyridine complexes]]

{{Sourceattribution|Dichlorotetrakis(pyridine)iron(II)}}