ImageFile = Tungsten hexacarbonyl 3D.png
IUPACName = hexacarbonyltungsten(0)
OtherNames = Hexacarbonyltungsten, Tungsten carbonyl
Section1 = Chembox Identifiers
CASNo = 14040-11-0
EINECS = 237-880-2
PubChem = 98884
InChI = 1/6CO.W/c6*1-2;
Section2 = Chembox Properties
Formula = C6O6W
MolarMass = 351.90 g/mol
Appearance = Colorless solid
Density = 2.65 g/cm3, solid
MeltingPt = 150 °C
BoilingPt = subl.
Solubility = Insoluble
SolubleOther = Sparingly in
Section3 = Chembox Hazards
MainHazards = Flammable (F), CO source
SPhrases = S22 S24/25
Section8 = Chembox Related
OtherCpds = Cr(CO)6 Fe(CO)5 Mn2(CO)10 Mo(CO)6
Tungsten hexacarbonyl (also called tungsten carbonyl) is the chemical compound with the formula W(CO)6. This complex gave rise to the first example of a dihydrogen complex.Kubas, G. J., Metal Dihydrogen and σ-Bond Complexes, Kluwer Academic/Plenum Publishers: New York, 2001.]
This colorless compound, like its
chromiumand molybdenumanalogs, is noteworthy as a volatile, air-stable derivative of tungstenin its zero oxidation state.
Preparation, properties, and structure
W(CO)6 is prepared by the reduction of WCl6 under a pressure of
carbon monoxide. It would be rare to prepare this inexpensive compound in the laboratory because the apparatus is expensive and the compound can be purchased cheaply. The compound is relatively air-stable. It is sparingly soluble in nonpolar organic solvents.
W(CO)6 adopts an
octahedral geometryconsisting of six rod-like CO ligands radiating from the central W atom with dipole moment 0 D.
All reactions of W(CO)6 commence with displacement of some CO ligands in W(CO)6. W(CO)6 behaves similarly to the Mo(CO)6 but tends to form compounds that are kinetically more robust.
Three of these CO ligands can be displaced by acetonitrile. [Kubas, G. J. and van der Sluys, L. S., "TricarbonylTris(nitrile) Complexes of Cr, Mo, and W", Inorganic Syntheses, 1990, 28, 29-33.] W(CO)6 has been used to desulfurize organosulfur compounds and as a precursor to catalysts for
afety and handling
Like all metal carbonyls, W(CO)6 is dangerous source of volatile metal as well as CO.
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