| 词条 | Tungsten dichloride dioxide |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 428738669 | Name = Tungsten(VI) dioxydichloride | ImageFile = WO2Cl2distances.png | ImageName = Tungsten(VI) dioxydichloride | OtherNames = tungsten(VI) dioxydichloride | Section1 = {{Chembox Identifiers | CASNo_Ref = {{cascite|correct|??}} | CASNo = 13520-76-8 | PubChem = 19092009 | EINECS = 236-862-1 | InChI = 1S/2ClH.2O.W/h2*1H;;;/q;;2*-2;/p-2 | SMILES = [O-2].[O-2].[Cl-].[Cl-].[W] | Section2 = {{Chembox Properties | Formula = WO2Cl2 | MolarMass = 286.749 g/mol | Appearance = yellow-red crystals | Density = 4.67 g/cm3, solid | MeltingPtC = 265 | BoilingPt = sublimes > 350 °C in vacuo | Solubility = decomposes | SolubleOther = slightly soluble in ethanol | Section3 = {{Chembox Structure | CrystalStruct = orthorhombic | Section7 = {{Chembox Hazards | EUClass = not listed }} Tungsten dichloride dioxide is the chemical compound with the formula WO2Cl2. It is a yellow-colored solid. It is used as a precursor to other tungsten compounds. Like other tungsten halides, WO2Cl2 is sensitive to moisture, undergoing hydrolysis. PreparationWO2Cl2 is prepared by ligand redistribution reaction from tungsten trioxide and tungsten hexachloride: 2 WO3 + WCl6 → 3 WO2Cl2 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] 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. StructureThe compound is a polymer consisting of distorted octahedral W centres. The monomer 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 datice W-O bond.[3] Related oxy halidesTungsten forms a number of oxyhalides including WOCl4, WOCl3, WOCl2. The corresponding bromides (WOBr4, WOBr3, WOBr2) are also known as is WO2I2.[4] ReactionsWO2Cl2 is a Lewis acid, forming soluble adducts of the type WO2Cl2L2, 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 WOCl4.[5] References1. ^{{cite journal | author = Tillack, J. | title = Tungsten Oxyhalides | journal = Inorg. Synth. | year = 1973 | volume = 14 | pages = 109–122 | doi = 10.1002/9780470132456.ch22 }} {{Tungsten compounds}}2. ^{{cite journal |author1=Gibson, V. C. |author2=Kee, T. P. |author3=Shaw, A. | title = New, improved synthesis of the group 6 oxyhalides, W(O)Cl4, W(O)2Cl2 and Mo(O)2Cl2 | journal = Polyhedron | year = 1988 | volume = 7 | issue = 7 | pages = 579–80 | doi = 10.1016/S0277-5387(00)86336-6}} 3. ^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}} 4. ^Holleman, A. F.; Wiberg, E. Inorganic Chemistry Academic Press: San Diego, 2001. {{ISBN|0-12-352651-5}}. 5. ^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}} 3 : Tungsten compounds|Oxohalides|Inorganic compound stubs |
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