Tungsten trichloride is a compound composed of transition metal tungsten and non-metallic chlorine. It is a low-valent tungsten chloride composed of 1 tungsten atom and 3 chlorine atoms. It is a kind of fine and uniformly dispersed particles. The brown or yellow-brown powder is an octahedral cluster compound, the English name is Tungsten Trichloride, the chemical formula is WCl3, the molar mass is 290.20, the CAS number is 12371-22-1, and the PubChem number is 5251191.
From the structural point of view, tungsten trichloride has 12 dichloride bridge ligands, and its structure is similar to that of niobium or tantalum chloride, while WCl2 has only 8 trichloride bridges.
From the perspective of physical and chemical properties, the appearance of tungsten trichloride is brown or yellow-brown powder, with a density of about 5.44g/cm3 and a melting point of about 550°C. It is slightly soluble in water and easily soluble in organic solvents such as acetone and carbon tetrachloride. , is stable in the air, but it is easy to decompose and emit chlorine gas when heated. It has certain reducing and oxidizing properties. It can not only react with oxidants such as oxygen to generate higher valence tungsten chlorides such as WCl4, WCl5 or WCl6, but also react with reducing agents such as hydrogen. The reaction produces tungsten powder, which reacts with carbon at high temperature to form tungsten carbide powder.
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