3D model (JSmol)
|Molar mass||351.901 g/mol|
|Melting point||170 °C (338 °F; 443 K) (decomposes)|
|Solubility||sparingly in THF|
|Main hazards||Flammable, CO source|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
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.
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. Tungsten carbonyl is widely used in electron beam-induced deposition technique - it is easily vaporized and decomposed by the electron beam providing a convenient source of tungsten atoms.
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.
One derivative is the dihydrogen complex W(CO)3[P(C6H11)3]2(H2) reported in 1982 by Kubas.
Safety and handling
Like all metal carbonyls, W(CO)6 is a dangerous source of volatile metal as well as CO.
- Kubas, G. J., Metal Dihydrogen and σ-Bond Complexes, Kluwer Academic/Plenum Publishers: New York, 2001.
- Randolph, S.; Fowlkes, J.; Rack, P. (2006). "Focused, Nanoscale Electron-Beam-Induced Deposition and Etching". Critical Reviews of Solid State and Materials Sciences. 31 (3): 55. doi:10.1080/10408430600930438.
- Kubas, G. J. and van der Sluys, L. S., "TricarbonylTris(nitrile) Complexes of Cr, Mo, and W", Inorganic Syntheses, 1990, 28, 29–33, doi:10.1002/9780470132593.ch6.