Dicobalt octacarbonyl

Dicobalt octacarbonyl
Dicobalt octacarbonyl, bridged C2v isomer

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
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.454 Edit this at Wikidata
EC Number
  • 233-514-0
RTECS number
  • GG0300000
UNII
UN number 3281
  • InChI=1S/8CO.2Co/c8*1-2;;/q;;;;;;;;2*+2 checkY
    Key: MQIKJSYMMJWAMP-UHFFFAOYSA-N checkY
  • InChI=1/8CO.2Co/c8*1-2;;/q;;;;;;;;2*+2
    Key: MQIKJSYMMJWAMP-UHFFFAOYAG
  • 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
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:
GHS02: FlammableGHS06: ToxicGHS07: Exclamation markGHS08: Health hazard
Danger
H251, H302, H304, H315, H317, H330, H351, H361, H412
P201, P260, P273, P280, P304+P340+P310, P403+P233
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasolineInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
4
3
1
Flash point -23 °C (-9.4 °F)[1]
Lethal dose or concentration (LD, LC):
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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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.

  1. ^ a b c d e NIOSH Pocket Guide to Chemical Hazards. "#0147". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ Pauson, Peter L.; Stambuli, James P.; Chou, Teh-Chang; Hong, Bor-Cherng (2014). "Octacarbonyldicobalt". Encyclopedia of Reagents for Organic Synthesis. John Wiley & Sons. pp. 1–26. doi:10.1002/047084289X.ro001.pub3. ISBN 9780470842898.
  3. ^ Cite error: The named reference Ullmann was invoked but never defined (see the help page).
  4. ^ Elschenbroich, C.; Salzer, A. (1992). Organometallics: A Concise Introduction (2nd ed.). Weinheim: Wiley-VCH. ISBN 3-527-28165-7.
  5. ^ Cite error: The named reference SolutionStructures was invoked but never defined (see the help page).