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Tungsten dichloride dioxide

Tungsten dichloride dioxide, or tungstyl chloride is the chemical compound with the formula . It is a yellow solid. It is used as a precursor to other tungsten compounds. Like other tungsten halides, is sensitive to moisture, undergoing hydrolysis.

Preparation

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. An alternative route highlights the oxophilicity of tungsten: :

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

Structure

Gaseous tungsten dichloride dioxide is a monomer. 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.

Reactions

is a Lewis acid, forming soluble adducts of the type , 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 .

References

References

  1. "C&L Inventory".
  2. Tillack, J.. (1973). "Inorganic Syntheses". [[Inorg. Synth.]].
  3. (1988). "New, improved synthesis of the group 6 oxyhalides, W(O)Cl4, W(O)2Cl2 and Mo(O)2Cl2". [[Polyhedron (journal).
  4. (1968). "Synthesis and Structure of Four- and Five-Coordinated Gaseous Oxohalides of Molybdenum(VI) and Tungsten(VI)". Inorganic Chemistry.
  5. Jarchow, O.; Schröder, F.; Schulz, H. "Kristallstruktur und Polytypie von WO2Cl2" Zeitschrift für anorganische und allgemeine Chemie 1968, vol. 363, p. 345ff. {{doi. 10.1002/zaac.19683630108
  6. Holleman, A. F.; Wiberg, E. ''Inorganic Chemistry'' Academic Press: San Diego, 2001. {{ISBN. 0-12-352651-5.
  7. 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. {{doi. 10.1016/S0277-5387(00)86203-8
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