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Tungsten(VI) Fluoride
Tungsten(VI) fluoride, also known as tungsten hexafluoride, is an inorganic compound with the formula W F6. It is a toxic, corrosive, colorless gas, with a density of about (roughly 11 times heavier than air). It is one of the densest known gases under standard conditions. WF6 ls commonly used by the semiconductor industry to form tungsten films, through the process of chemical vapor deposition. This layer is used in a low-resistivity metallic "interconnect". It is one of seventeen known binary hexafluorides. Properties The WF6 molecule is octahedral with the symmetry point group of Oh. The W–F bond distances are . p. 4-93. Between , tungsten hexafluoride condenses into a pale yellow liquid having the density of at . At it freezes into a white solid having a cubic crystalline structure, the lattice constant of 628 pm and calculated density . At this structure transforms into an orthorhombic solid with the lattice constants of , , and , and the density of . In this pha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tungsten Hexachloride
Tungsten hexachloride is the chemical compound of tungsten and chlorine with the formula WCl6. This dark violet blue species exists as a volatile solid under standard conditions. It is an important starting reagent in the preparation of tungsten compounds. Other examples of charge-neutral hexachlorides are rhenium(VI) chloride and molybdenum(VI) chloride. The highly volatile tungsten hexafluoride is also known. As a d0 ion, W(VI) forms diamagnetic derivatives. The hexachloride is octahedral with equivalent W–Cl distances of 2.24–2.26 Å. Preparation Tungsten hexachloride can be prepared by chlorinating tungsten metal in a sealed tube at 600 °C: : W + 3 Cl2 → WCl6 Properties and Reactions Tungsten (VI) chloride is a blue-black solid at room temperature. At lower temperatures, it becomes wine-red in color. A red form of the compound can be made by rapidly condensing its vapor, which reverts to the blue-black form on gentle heating. It is readily hydrolyzed, even ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |