Tungsten dichloride dioxide
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| Tungsten(VI) dioxydichloride | |
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| General | |
| Other names | tungsten(VI) dioxydichloride |
| Molecular formula | WO2Cl2 |
| Molar mass | 286.75 g/mol |
| Appearance | yellow crystals |
| Crystal structure | orthorhombic |
| CAS number | [13520-76-8] |
| Properties | |
| Density and phase | 4.67 g/cm3, solid |
| Solubility | decomposes in water |
| Melting point | 265 °C |
| Boiling point | sublimes > 350 °C in vacuo |
| Hazards | |
| EU classification | not listed |
| NFPA 704 | 2-0-2 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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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.
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[edit] Preparation
WO2Cl2 is prepared by ligand redistribution reaction:
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.[1] An alternative route highlights the "oxophilicity" of tungsten:[2]
- WCl6 + 2 O(Si(CH3)3)2 → 3 WO2Cl2 + 4 ClSi(CH3)3
This reaction, like the preceding one, proceeds via the intermediacy of W(O)Cl4.
[edit] Other tungsten oxy chlorides
Tungsten forms a number of oxyhalides including WOCl4, WOCl3, WOCl2. The corresponding bromides are also known as is WO2I2.[3]
[edit] Reactions
WO2Cl2 is a Lewis acid, forming soluble adducts of the type WO2Cl2L2, where L is a donor ligand such as bipy.
[edit] References
- ^ Tillack, J. "Tungsten Oxyhalides" Inorganic Syntheses, 1973, XIV, 109-122. ISBN 0-07-071320-0.
- ^ 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.
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
[edit] External links
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