Dicobalt octacarbonyl

Dicobalt octacarbonyl
	Co2(CO)8 soaked in hexanes
Names
	IUPAC name Octacarbonyldicobalt(Co—Co)
	Other names Cobalt carbonyl (2:8), di-mu-Carbonylhexacarbonyldicobalt, Cobalt octacarbonyl, Cobalt tetracarbonyl dimer, Dicobalt carbonyl, Octacarbonyldicobalt
Identifiers
CAS Number	10210-68-1 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	2007057 ;
ECHA InfoCard	100.030.454
EC Number	233-514-0;
PubChem CID	25049;
RTECS number	GG0300000;
UNII	MDH533S43Q ;
UN number	3281
CompTox Dashboard (EPA)	DTXSID10895040 ;
	InChI InChI=1S/8CO.2Co/c81-2;;/q;;;;;;;;2+2 Key: MQIKJSYMMJWAMP-UHFFFAOYSA-N ; InChI=1/8CO.2Co/c81-2;;/q;;;;;;;;2+2 Key: MQIKJSYMMJWAMP-UHFFFAOYAG;
	SMILES O=C=[Co]1(=C=O)(=C=O)C(=O)[Co](=C=O)(=C=O)(=C=O)C1=O; O=C=[Co-4](=C=O)(=C=O)(=C=O)[Co-4](=C=O)(=C=O)(=C=O)=C=O;
Properties
Chemical formula	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
Solubility in water	insoluble
Vapor pressure	0.7 mmHg (20 °C)
Structure
Dipole moment	1.33 D (C2v isomer); 0 D (D3d isomer)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Potential carcinogen
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H251, H302, H304, H315, H317, H330, H351, H361, H412
Precautionary statements	P201, P260, P273, P280, P304+P340+P310, P403+P233
NFPA 704 (fire diamond)	4 3 1
Flash point	−23 °C (−9 °F; 250 K)
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	15 mg/kg (oral, rat)
	NIOSH (US health exposure limits):
PEL (Permissible)	none
REL (Recommended)	TWA 0.1 mg/m3
IDLH (Immediate danger)	N.D.
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). verify (what is ?) Infobox references

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. It is the parent member of a family of hydroformylation catalysts. Each molecule consists of two cobalt atoms bound to eight carbon monoxide ligands, although multiple structural isomers are known. Some of the carbonyl ligands are labile.

Names

Co₂(CO)₈ soaked in hexanes
IUPAC name Octacarbonyldicobalt(Co—Co)
Other names Cobalt carbonyl (2:8), di-mu-Carbonylhexacarbonyldicobalt, Cobalt octacarbonyl, Cobalt tetracarbonyl dimer, Dicobalt carbonyl, Octacarbonyldicobalt
Identifiers
CAS Number	10210-68-1^Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	2007057^Y
ECHA InfoCard	100.030.454
EC Number	233-514-0
PubChem CID	25049
RTECS number	GG0300000
UNII	MDH533S43Q^Y
UN number	3281
CompTox Dashboard (EPA)	DTXSID10895040
InChI InChI=1S/8CO.2Co/c81-2;;/q;;;;;;;;2+2^Y Key: MQIKJSYMMJWAMP-UHFFFAOYSA-N^Y InChI=1/8CO.2Co/c81-2;;/q;;;;;;;;2+2 Key: MQIKJSYMMJWAMP-UHFFFAOYAG
SMILES O=C=[Co]1(=C=O)(=C=O)C(=O)[Co](=C=O)(=C=O)(=C=O)C1=O O=C=[Co-4](=C=O)(=C=O)(=C=O)[Co-4](=C=O)(=C=O)(=C=O)=C=O
Properties
Chemical formula	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
Solubility in water	insoluble
Vapor pressure	0.7 mmHg (20 °C)
Structure
Dipole moment	1.33 D (C_2v isomer) 0 D (D_3d isomer)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Potential carcinogen
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H251, H302, H304, H315, H317, H330, H351, H361, H412
Precautionary statements	P201, P260, P273, P280, P304+P340+P310, P403+P233
NFPA 704 (fire diamond)	4 3 1
Flash point	−23 °C (−9 °F; 250 K)
Lethal dose or concentration (LD, LC):
LD₅₀ (median dose)	15 mg/kg (oral, rat)
NIOSH (US health exposure limits):
PEL (Permissible)	none
REL (Recommended)	TWA 0.1 mg/m³
IDLH (Immediate danger)	N.D.
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). N verify (what is ^YN ?) Infobox references