Tungsten Tetrafluoride

Tungsten tetrafluoride is a reddish-brown or reddish black inorganic compound. Its physical properties are as follows: chemical formula: F4W, molecular weight: 259.83, molar mass: 295.8336128g / mol, which is easily hydrolyzed and oxidized. Tungsten tetrafluoride CAS registry number is 13766-47-7, ChemSpider registry number is 123101, and EC registry number is 139,582. When using tungsten hexafluoride for produce tungsten film, by chemical deposition method tungsten tetrafluoride and tungsten pentafluoride can play an intermediary role in this reaction. At  800℃ vacuum conditions it will occur disproportionation reaction to produce tungsten pentafluoride and tungsten difluoride. What’s more F4W is mainly used in organic synthesis.
There are some producing methods of tetrafluoride tungsten. The first one is by treatment of the coordination complex WCl4 (MeCN) with AsF3 to produce tungsten tetrafluoride. The second is produced by form the reaction of the tungsten hexafluoride (WF6) and wfilament at 600-800℃. The third is reacting between benzene and WF6 at 110 ℃. Fourth, it can be made of by reacting tungsten hexafluoride and phosphorus trifluoride reaction at room temperature which involve in liquid hydrogen fluoride.

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