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Dicobalt octacarbonyl
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Dicobalt octacarbonyl is an organocobalt compound with composition Co2(CO)8. This metal carbonyl is used as a reagent and catalyst in organometallic chemistry and organic synthesis, and is central to much known organocobalt chemistry.[2][3] It is the parent member of a family of hydroformylation catalysts.[4] Each molecule consists of two cobalt atoms bound to eight carbon monoxide ligands, although multiple structural isomers are known.[5] Some of the carbonyl ligands are labile.
Quick Facts Names, Identifiers ...
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![]() Co2(CO)8 soaked in hexanes | |
Names | |
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IUPAC name
Octacarbonyldicobalt(Co—Co) | |
Other names
Cobalt carbonyl (2:8), di-mu-Carbonylhexacarbonyldicobalt, Cobalt octacarbonyl, Cobalt tetracarbonyl dimer, Dicobalt carbonyl, Octacarbonyldicobalt | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.030.454 ![]() |
EC Number |
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PubChem CID |
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RTECS number |
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UNII | |
UN number | 3281 |
CompTox Dashboard (EPA) |
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Properties | |
Co2(CO)8 | |
Molar mass | 341.95 g/mol |
Appearance | red-orange crystals |
Density | 1.87 g/cm3 |
Melting point | 51 to 52 °C (124 to 126 °F; 324 to 325 K) |
Boiling point | 52 °C (126 °F; 325 K) decomposes |
insoluble | |
Vapor pressure | 0.7 mmHg (20 °C)[1] |
Structure | |
1.33 D (C2v isomer) 0 D (D3d isomer) | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
Potential carcinogen |
GHS labelling: | |
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Danger | |
H251, H302, H304, H315, H317, H330, H351, H361, H412 | |
P201, P260, P273, P280, P304+P340+P310, P403+P233 | |
NFPA 704 (fire diamond) | |
Flash point | -23 °C (-9.4 °F)[1] |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
15 mg/kg (oral, rat) |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
none[1] |
REL (Recommended) |
TWA 0.1 mg/m3[1] |
IDLH (Immediate danger) |
N.D.[1] |
Safety data sheet (SDS) | External SDS |
Related compounds | |
Related metal carbonyls |
Iron pentacarbonyl Diiron nonacarbonyl Nickel tetracarbonyl |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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