Tungsten dichloride dioxide
- Tungsten dichloride dioxide
Chembox new
Name = Tungsten(VI) dioxydichloride
ImageFile = WO2Cl2.png ImageName = Tungsten(VI) dioxydichloride
OtherNames = tungsten(VI) dioxydichloride
Section1 = Chembox Identifiers
CASNo = 13520-76-8
Section2 = Chembox Properties
Formula = WO2Cl2
MolarMass = 286.75 g/mol
Appearance = yellow crystals
Density = 4.67 g/cm3, solid
MeltingPt = 265 °C
BoilingPt = sublimes > 350 °C in vacuo
Solubility = decomposes
Section3 = Chembox Structure
CrystalStruct = orthorhombic
Section7 = Chembox Hazards
EUClass = not listed
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, ungoing hydrolysis.
Preparation
WO2Cl2 is prepared by ligand redistribution reaction:: 2 WO3 + WCl6 → 3 WO2Cl2Using 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. [Tillack, J. "Tungsten Oxyhalides" Inorganic Syntheses, 1973, XIV, 109-122. ISBN 0-07-071320-0.] An alternative route highlights the "oxophilicity" of tungsten: [Gibson, V. C.; Kee, T. P.; Shaw, A. "New, improved synthesis of the group 6 oxyhalides, W(O)Cl4, W(O)2Cl2 and Mo(O)2Cl2" Polyhedron 1988, volume 7, pages 579-80.] :WCl6 + 2 O(Si(CH3)3)2 → 3 WO2Cl2 + 4 ClSi(CH3)3This reaction, like the preceding one, proceeds via the intermediacy of W(O)Cl4.
Other tungsten oxy chlorides
Tungsten forms a number of oxyhalides including WOCl4, WOCl3, WOCl2. The corresponding bromides are also known as is WO2I2. [Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.]
Reactions
WO2Cl2 is a Lewis acid, forming soluble adducts of the type WO2Cl2L2, where L is a donor ligand such as bipy.
References
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