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Diiron nonacarbonyl (referred to as diiron enneacarbonyl in the older literature) is the chemical compound with the formula Fe2(CO)9. This metal carbonyl is an important reagent in organometallic chemistry and of occasional use in organic synthesis. It is a more reactive source of Fe(0) than Fe(CO)5 and less dangerous to handle because it is nonvolatile. One of the strangest properties of this micaceous, orange solid is that it is virtually insoluble in all known solvents.
Additional recommended knowledge
Photolysis of Fe(CO)5, typically in acetic acid solution, produces Fe2(CO)9 in good yield:
Fe2(CO)9 consists of a pair of Fe(CO)3 centers linked by three bridging CO ligands. The iron atoms are equivalent and octahedral. Elucidation of the structure of Fe2(CO)9 has proven to be challenging because of its very low solubility, which prevents growth of crystals. The Mößbauer spectrum reveals one quadrupole doublet, consistent with the D3h-symmetric structure.
Fe2(CO)9 is primarily employed as a precursor to compounds of the type Fe(CO)4L and Fe(CO)3(diene). Such syntheses are typically conducted in THF solution. In these conversions, it is proposed that small amounts of Fe2(CO)9 dissolve according the following reaction:
Fe2(CO)9 is a source of CO although it is nonvolatile and insoluble.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Diiron_nonacarbonyl". A list of authors is available in Wikipedia.|