ChemicalBook > Product Catalog > Organic Chemistry > Organometallic compounds > Rare-Earth Metal > COBALT CARBONYL
COBALT CARBONYL Chemical Properties
- Melting point:51-52 °C
- Boiling point:52°C
- Density 1.81
- Flash point:-13 °C
- storage temp. 2-8°C
- form crystal
- Specific Gravity1.73
- color dark orange
- Water Solubility Insoluble in water. Soluble in alcohol, ether and carbon disulfideSoluble in ether, naphtha and carbon disulfide. Slightly soluble in alcohol. Insoluble in water.
- Sensitive Air Sensitive
- Hydrolytic Sensitivity7: reacts slowly with moisture/water
- Merck 13,3112
- Exposure limitsTLV-TWA: 0.1 mg/m3 as Co (ACGIH)
PEL-TWA: 0.1 mg/m3 as Co (OSHA).
- CAS DataBase Reference10210-68-1(CAS DataBase Reference)
- EPA Substance Registry SystemCobalt carbonyl (10210-68-1)
- Hazard Codes F,Xn,T+
- Risk Statements 11-22-40-43-48/20-52/53-62-26
- Safety Statements 36/37-61-45-28
- RIDADR UN 3190 4.2/PG 2
- WGK Germany 3
- RTECS GG0300000
- F 23-25
- TSCA No
- HazardClass 4.1
- PackingGroup II
- HS Code 29319090
- ToxicityLD50 in mice, rats (mg/kg): 377.7, 753.8 by gavage (Spiridonova, Shabalina)
COBALT CARBONYL Usage And Synthesis
- DescriptionCobalt carbonyl (known as dicobalt octocarbonyl) is a versatile reagent and catalyst in organometallic chemistry and organic synthesis. It has catalytic applications in various chemical reactions such as hydroformylation of unsaturated compound, homogeneous hydrogenation of aromatic hydrocarbons, hydrosilation of alkenes, reactions of disulfides such as carbonylation to thio-esters and desulfurization to sulfides, hydroformylation as well as the conversion of alkenes into aldehydes. It can also promote both the Pauson-Khand reactions and Nicholas reaction.
- Reagent for the Pauson-Khand conversion of an olefin, an alkyne and carbon monoxide into a cyclopentenone.
- Precatalyst in combination with triphenylphosphite for the cataytic Pauson-Khand reaction.
- Catalyzes the rearrangement of 1-alkynylcyclopropanols to cyclopentenones.
- Catalyzes the conversion of aziridines to β-lactams.
- Catalyzes the conversion of diallylanilines and aryliminies to quinolines.
- Reagent for the selective cleavage of benzyl ethers.
- Domino Nicholas and Pauson-Khand process induced by nitroarene reduction.
- SourcesAdkins, Homer., and G. Krsek. JACS 71.9(1949):3051-3055.
Feder, Harold M., and J. Halpern. Cheminform 7.7(1976):no-no.
Seitz, Friedrich, and M. S. Wrighton. Angewandte Chemie International Edition 27.2(1988):289-291.
Antebi, Shlomo, and H. Alper. Tetrahedron Letters 16.38(1985):no-no.
Krafft, Marie E., L. V. R. Boñaga, and C. Hirosawa. Cheminform 32.37(2001):no-no.
- Chemical Propertiesred-orange to dark red crystals or flakes
- Chemical PropertiesCobalt carbonyl is a pyrophoric (spontaneously flammable in air), red-orange (when pure) to dark-brown crystalline solid.
- Physical propertiesOrange crystals; density 1.78 g/cm3; melts at 5l°C; decomposes above this temperature; insoluble in water; soluble in most organic solvents including alcohol, ether, carbon disulfide.
- UsesIt is used as a catalyst in many organicconversion reactions, which include hydrogenation,isomerization, hydroformylation,polymerization, and carbonylation.
- UsesCobalt octacarbonyl is used as a catalyst in the Oxo process. It also is used as a catalyst for hydrogenation, isomerization, hydrosilation and polymerization reactions. The compound is also a source of producing pure cobalt metal and its purified salts.
- PreparationCobalt octacarbonyl is prepared by the reaction of finely divided cobalt with carbon monoxide under pressure:
2Co + 8CO → Co2(CO)8
The compound may be prepared in a similar way from cobalt(II) iodide. Also, it may be prepared by thermal decomposition of cobalt carbonyl hydride:
2HCo(CO)4 → Co2(CO)8 + H2
- HazardToxic by ingestion and inhalation.
- Health HazardDicobalt octacarbonyl exhibits moderate toxicityby inhalation route and somewhatlower toxicity by intraperitoneal and oralroutes. However, it is much less toxicthan nickel tetracarbonyl or iron pentacarbonyl.A 2-hour LC50 value in mice isreported as 27 mg/m3 (Lewis 1996). Anoral LD50 value in rats is within the rangeof 750–800 mg/kg. It decomposes, evolvingtoxic carbon monoxide.
- Safety ProfilePoison by inhalation and intraperitoneal routes. Questionable carcinogen. Decomposes in air to form a product that ignites spontaneously in air. "hen heated to decomposition it emits acrid smoke and fumes. See also CARBONYLS and COBALT COMPOUNDS.
- Potential ExposureThis material is used as a catalyst for a number of reactions. It is also used in antiknock gasoline and for high-purity cobalt salts.
- ShippingUN3124 Toxic solids, self-heating, n.o.s., Hazard Class: 6.1; 6.1-Poisonous materials, 4.2-Spontaneously combustible material. Technical Name Required. UN3190 Self-heating solid, inorganic, Hazard Class: 4.2; Labels: 4.2-Spontaneously combustible material, Technical Name Required. UN1325 Flammable solid, organic, n.o.s. Hazard Class: 4.1; Labels: 4.1-Flammable solid
- Purification MethodsIt forms orange-brown crystals on recrystallisation from n-hexane under a carbon monoxide atmosphere [Ojima et al. J Am Chem Soc 109 7714 1987; see also Hileman in Preparative Inorganic Reactions, Ed. Jolly, Vol 1 p 101 1987].
- IncompatibilitiesIncompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Decomposes on exposure to air or heat (@ ~52°C) producing toxic fumes of cobalt and oxides of carbon
COBALT CARBONYL Preparation Products And Raw materials
- Company Name:BeiJing Hwrk Chemicals Limted Gold
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