|Molar mass||396.61 g/mol|
|Appearance||dark blue crystals, moisture sensitive|
|Melting point||275 °C (527 °F; 548 K)|
|Boiling point||346.7 °C (656.1 °F; 619.8 K)|
|Solubility in chlorocarbons||soluble|
|Crystal structure||α:rhombohedral, β: hexagonal|
|Dipole moment||0 D|
|Main hazards||oxidizer; hydrolysis releases HCl|
|EU Index||Not listed|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Tungsten hexachloride is the chemical compound of tungsten and chlorine with the formula WCl6. This dark violet blue species exists as a volatile solid under standard conditions. It is an important starting reagent in the preparation of tungsten compounds. WCl6 is a rare example of a charge-neutral hexachloride, another example being ReCl6. Better known than WCl6 is the still more volatile WF6.
As a d0 ion, W(VI) forms diamagnetic derivatives. The hexachloride is octahedral with equivalent W-Cl distances of 2.24 - 2.26 Å. In acceptor, the chloride ligands are donors in both sigma- and pi sense.
Tungsten hexachloride can be prepared by chlorinating tungsten metal in a sealed tube at 600°C: 
- W + 3 Cl2 → WCl6
Properties and Reactions
Tungsten (VI) chloride is a blue-black crystalline solid at room temperature. At lower temperatures, it becomes wine-red in color. A red form of the compound can be made by rapidly condensing its vapor, which reverts to the blue-black form on gentle heating. It is readily hydrolyzed in moist air, giving the orange oxychlorides WOCl4 & WO2Cl2, and subsequently, tungsten trioxide. WCl6 is soluble in carbon disulfide, carbon tetrachloride and phosphorus oxychloride.
- WCl6 +3 Al2(CH3)6 → W(CH3)6 + 3 Al2(CH3)4Cl2
WCl6 is an aggressively corrosive oxidant, and hydrolyzes to release hydrogen chloride.
- J. W. Herndon "Tungsten(VI) Chloride" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. doi:10.1002/047084289.
- J. C. Taylor and P. W. Wilson "The structure of [beta]-tungsten hexachloride by powder neutron and X-ray diffraction" Acta Crystallographic (1974). B30, 1216-1220. doi:10.1107/S0567740874004572.
- Ludwig F. Audrieth (2007). Inorganic Syntheses. McGraw-Hill Book Company. p. 165. ISBN 9780470131626.
- M. A. Umbreit, K. B. Sharpless (1990). "Deoxygenation of Epoxides with Lower Valent Tungsten Halides: trans-Cyclododecene". Org. Synth.; Coll. Vol. 7, p. 121