Tungsten chloride is divided into tungsten hexachloride, tungsten pentachloride, tungsten tetrachloride, tungsten dichloride, etc. These are key raw materials for many new materials. Among them, tungsten pentachloride and tungsten hexachloride have been studied more and used widely.
The chemical formula of tungsten pentachloride is W2Cl10, which is produced by tungsten tetrachloride WCl4 and tungsten hexachloride WCl6 using the same chlorine bridge. Its structure is similar to the crystal structure of MoCl5 and NbCl5, and they are twinned with each other. Tungsten hexachloride powder is a dark brown crystal, and tungsten tetrachloride powder is gray-black (the other is reddish-brown), but because of the difference in particle size between the powder and the crystal, coupled with the scattering of visible light, the human eye Basically, it is impossible to distinguish tungsten pentachloride from tungsten chloride in other valence states.
Among them, the more important research has systematically reported that the structure of tungsten chloride in different valence states has been studied systematically using the density functional DFT theory. The research results show that tungsten pentachloride is especially unstable. Not so good, very easy to convert to tungsten tetrachloride, which disproportionates to tungsten dichloride and tungsten hexachloride.
Tungsten pentachloride (W2Cl10) is a monoclinic, fibrous dark green crystal. As a rare chemical substance with a ratio of tungsten to chlorine of 1:5, it has unique characteristics of tungsten price adjustment and chlorine atom dissolution. The regularity of price adjustment and the release of oxychloride free radicals have the advantages of high predictability and precise positioning on time, and are regarded as potential substances for future development in high-tech fields such as semiconductor materials, solar power generation, catalytic reactions, and military defense and security.
Tungsten pentachloride was first described in the reference manuscripts in the 1960s, when biologists produced other valence tungsten chlorides (such as tungsten hexachloride, tungsten tetrachloride, dichloride, etc.) obtained by-products. Restricted by the development trend of science and technology, there is no report on the production of high-purity tungsten pentachloride. Tungsten pentachloride is often mixed with many metal residues, and its melting point and melting point data are seriously lacking, which are scattered in various tungsten In the chemical dictionary of metal materials, the range of data information is very wide, such as melting point at 220-250 ° C, melting point at 270-290 ° C, only empirical reference.
Tungsten hexachloride (WCl6) is a low melting point (346 ° C), specific large crystal powder. As a new material raw material, tungsten hexachloride is widely used in many fields towards the main application of new materials. For example, the application of catalytic reactions in the chemical manufacturing industry, the production and maintenance of the machinery manufacturing industry, and the surface coating solution in the glass industry have been widely used in new material industries such as vehicles and glass industries. It can also be used for the purification of tungsten and the generation of organic compounds. Tungsten hexachloride is used as a new raw material, and its purity is a key concern for the main uses in the middle and lower reaches. In addition, with the application of tungsten hexachloride becoming wider and wider, the requirements for tungsten hexachloride are also increasing. bigger.
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