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Names | |
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Other names
cobalt dodecacarbonyl, cobalt carbonyl | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.037.951 ![]() |
EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
Co4(CO)12 | |
Molar mass | 571.858 g/mol |
Appearance | black crystal |
Density | 2.09 g/cm3 |
Melting point | decomposes at 60 °C (140 °F; 333 K) |
Hazards | |
GHS labelling: | |
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Warning | |
H228, H301, H317, H331, H351 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tetracobalt dodecacarbonyl is the chemical compound with the formula Co4(CO)12. It is a black crystalline compound that is insoluble in water and easily oxidized by air. It is an example of a metal carbonyl cluster.
This compound is synthesized by decarbonylation of Co2(CO)8.
The molecule consists of a tetrahedral Co4 core, but the molecular symmetry is C3v. Three carbonyl ligands are bridging ligands and nine are terminal.[1] The average Co-Co distance is 2.499 Å, the average C-O bond length is 1.133 Å, and the average Co-C-O angle is 177.5°.[2][3]
Rh4(CO)12 adopts the same C3v structure but Ir4(CO)12 has perfect Td symmetry with no bridging CO ligands groups.[4] The Rh4 and Ir4 clusters are more thermally robust than that of the Co4 compound, reflecting the usual trend in the strengths of metal-metal bond for second and third row metals vs those for the first row metals. There has been disagreement between the theoretically predicted and experimental structure of tetracobalt dodecacarbonyl.[5][4][6]