Tungsten dichloride dioxide
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| Template:Longitem | Template:Chem2 |
| Molar mass | Template:Chem molar mass |
| Appearance | Yellow-red crystals |
| Density | 4.67 g/cm3 |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Solubility | slightly soluble in ethanol |
| Template:Longitem | orthorhombic |
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Tungsten dichloride dioxide, or tungstyl chloride is the chemical compound with the formula Template:Chem2. It is a yellow solid. It is used as a precursor to other tungsten compounds. Like other tungsten halides, Template:Chem2 is sensitive to moisture, undergoing hydrolysis.
Preparation
Template:Chem2 is prepared by ligand redistribution reaction from tungsten trioxide and tungsten hexachloride:
Using a two-zone tube 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]
This reaction, like the preceding one, proceeds via the intermediacy of [[Tungsten(VI) oxytetrachloride|Template:Chem2]].
Structure
Gaseous tungsten dichloride dioxide is a monomer.[3] Solid tungsten dichloride dioxide is a polymer consisting of distorted octahedral W centres. The polymer is characterized by two short W-O distances, typical for a multiple W-O bond, and two long W-O distances more typical of a single or dative W-O bond.[4]
Related oxyhalides
Tungsten forms a number of oxyhalides including [[Tungsten(VI) oxytetrachloride|Template:Chem2]], Template:Chem2, Template:Chem2. The corresponding bromides ([[Tungsten(VI) oxytetrabromide|Template:Chem2]], Template:Chem2, Template:Chem2) are also known as is Template:Chem2.[5]
Reactions
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Template:Chem2 is a Lewis acid, forming soluble adducts of the type Template:Chem2, where L is a donor ligand such as bipyridine and dimethoxyethane. Such complexes often cannot be prepared by depolymerization of the inorganic solid, but are generated in situ from Template:Chem2.[6]
References
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- ↑ Jarchow, O.; Schröder, F.; Schulz, H. "Kristallstruktur und Polytypie von WO2Cl2" Zeitschrift für anorganische und allgemeine Chemie 1968, vol. 363, p. 345ff. Script error: No such module "CS1 identifiers".
- ↑ Holleman, A. F.; Wiberg, E. Inorganic Chemistry Academic Press: San Diego, 2001. Template:ISBN.
- ↑ K. Dreisch, C. Andersson, C. Stalhandske "Synthesis and structure of dimethoxyethane-dichlorodioxo-tungsten(VI)—a highly soluble derivative of tungsten dioxodichloride" Polyhedron 1991, volume 10, p. 2417. Script error: No such module "CS1 identifiers".
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