Dichlorotetrakis(pyridine)iron(II) explained

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

  1. 10.1021/ja106853y. A Strategy for the Synthesis of Well-Defined Iron Catalysts and Application to Regioselective Diene Hydrosilylation. 2010. Wu. Jessica Y.. Stanzl. Benjamin N.. Ritter. Tobias. Journal of the American Chemical Society. 132. 38. 13214–13216. 20809631.
  2. 10.1021/ic50184a002. Crystal and molecular structures of trans-tetrakis(pyridine)dichloroiron(II), -nickel(II), and -cobalt(II) and trans-tetrakis(pyridine)dichloroiron(II) monohydrate. 1978. Long. Gary J.. Clarke. Peter J.. Inorganic Chemistry. 17. 6. 1394–1401.
  3. 10.1002/9780470132326.ch64. Tetrapyridino-Ferrous Chloride (Yellow Salt). Inorganic Syntheses. 1939. Baudisch. Oskar. Hartung. Walter H.. 184–185. 1.

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