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Dichlorotetrakisiron is the coordination complex with the formula FeCl24. 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. 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. CoCl24 and NiCl24. It is prepared by treating ferrous chloride with an excess of pyridine.
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