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Dicobalt octacarbonyl is the chemical compound Co2(CO)8. This metal carbonyl is a versatile reagent in organometallic chemistry and organic synthesis. It continues to be used as a catalyst for hydroformylation catalysis.
Additional recommended knowledge
Synthesis and structure
The high pressure reaction of cobalt(II) salts with CO, often in the presence of cyanide, affords this compound. It is an orange-colored, pyrophoric material. It is one of the more structurally complex of the binary metal carbonyls because it exists as isomers:
The predominant isomer resembles Fe2(CO)9, less one bridging CO. The Co-Co distance is 2.52 Å and the Co-COterminal and Co-CObridge distances are 1.80 and 1.90 Å, respectively. These isomers rapidly interconvert. The minor isomer has no bridging CO ligands, it is described (CO)4Co-Co(CO)4 (D3d symmetry group). The major isomer contains two bridging CO ligand and features octahedral cobalt, describable as (CO)3Co(μ-CO)2Co(CO)3 (C2v symmetry group).
Co2(CO)8 is a volatile source of cobalt; it releases carbon monoxide upon decomposition. This is one of the more reactive binary metal carbonyls, and some samples will contain pyrophoric particles of cobalt that can inflame in air. Samples are refrigerated during storage.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dicobalt_octacarbonyl". A list of authors is available in Wikipedia.|