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Tungsten dichloride dioxide

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Tungsten(VI) dioxydichloride
Tungsten(VI) dioxydichloride
Names
Other names tungsten(VI) dioxydichloride
Identifiers
CAS Number
3D model (JSmol)
ECHA InfoCard 100.033.496 Edit this at Wikidata
EC Number
  • 236-862-1
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/2ClH.2O.W/h2*1H;;;/q;;2*-2;/p-2
SMILES
  • ....
Properties
Chemical formula WO2Cl2
Molar mass 286.749 g/mol
Appearance yellow crystals
Density 4.67 g/cm, solid
Melting point 265 °C (509 °F; 538 K)
Boiling point sublimes > 350 °C in vacuo
Solubility in water decomposes
Structure
Crystal structure orthorhombic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

Tungsten dichloride dioxide is the chemical compound with the formula WO2Cl2. This yellow-colored solid is used as a precursor to other tungsten compounds. Like other tungsten halides, WO2Cl2 is sensitive to moisture, undergoing hydrolysis.

Preparation

WO2Cl2 is prepared by ligand redistribution reaction from tungsten trioxide and tungsten hexachloride:

2 WO3 + WCl6 → 3 WO2Cl2

Using a two-zone furnace, a vacuum-sealed tube containing these solids is heated to 350 C. The yellow product sublimes to the cooler end of the reaction tube. No redox occurs in this process. An alternative route highlights the oxophilicity of tungsten:

WCl6 + 2 O(Si(CH3)3)2 → 3 WO2Cl2 + 4 ClSi(CH3)3

This reaction, like the preceding one, proceeds via the intermediacy of WOCl4.

Other tungsten oxy chlorides and related oxy halides

Tungsten forms a number of oxyhalides including WOCl4, WOCl3, WOCl2. The corresponding bromides (WOBr4, WOBr3, WOBr2) are also known as is WO2I2.

Reactions

WO2Cl2 is a Lewis acid, forming soluble adducts of the type WO2Cl2L2, where L is a donor ligand such as bipyridine.

References

  1. Tillack, J. (1973). "Tungsten Oxyhalides". Inorg. Synth. 14: 109–122. doi:10.1002/9780470132456.ch22.
  2. Gibson, V. C.; Kee, T. P.; Shaw, A. (1988). "New, improved synthesis of the group 6 oxyhalides, W(O)Cl4, W(O)2Cl2 and Mo(O)2Cl2". Polyhedron. 7 (7): 579–80. doi:10.1016/S0277-5387(00)86336-6.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. Holleman, A. F.; Wiberg, E. Inorganic Chemistry Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
Tungsten compounds
Tungsten(0)
Tungsten(II)
Tungsten(III)
Tungsten(IV)
Tungsten(V)
Tungsten(VI)
Organotungsten(VI) compounds
Polytungstate salts


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