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Tungsten pentachloride is a hygroscopic black crystal with molecular formula of WCl5 (or W2Cl10), CAS No. of 13470-14-9, and relative density of 3.88g/cm3. WCl5 is an inorganic compound, which is analogous in many ways to the more familiar molybdenum pentachloride. Properties 1. Dissolved in water and decomposed to form W2O5. 2. Easily decomposed if exposed to the air. 3. Heated in the air to obtain tungsten oxytetrachloride (WOCl4). 4. Very sensitive to humidity, placed in the air to generate a…

Tungsten tetrachloride, or tungsten (IV) chloride, is a diamagnetic black solid with the molecular formula of WCl4, CAS number of 13470-13-8, and a density of 4.62g/cm3. The hygroscopicity of WCl4 is less strong than WCl5, but it’s easy to hydrolyze. WCl4 does not melt or sublimate even if heated, but it resolves at melting point or hydrolyzes in a vacuum. WCl4 is an inorganic compound with corrosivity. The compound is of interest in research as one of a handful of…

Tungsten dichloride dioxide is a thin yellow-colored crystalline with the chemical formula of WO2Cl2, and CAS No. of 13520-76-8. It is used as a precursor to other tungsten compounds. Physical Properties 1. Stable at normal temperature and pressure. 2. Dissolvable in cold water, decomposed in hot water, soluble in ammonia and alkali, and insoluble in ethanol. 3. Like other tungsten halides, sensitive to moisture in the atmosphere, so the reaction tube must be opened in a dry nitrogen atmosphere and…

Tungsten dichloride is a pale-gray amorphous powder with chemical formula of WCl2, molecular weight of 254.76, CAS No. of 13470-12-7, and density of 5.436g/cm3. WCl2 is easy to form a regular octahedron group. And it is mainly applied in the field of new materials as raw material. Properties 1. Very unstable in the air, and easily oxidized. 2. Dissolved in hydrochloric acid (HCL), ethanol (C?H?OH) and ether (C4H10O). 3. Saved in excess hydrogen chloride. 4. Decomposed at the temperature of…

Tungsten pentaboride, also called tungsten boride (W2B5), is a black powder with chemical formula of B5W2, molecular weight of 428.79100, exact weight of 430.00300, CAS No. of 12007-98-6, melting point of 210~214°C and boiling point of 110°C (1 Torr). It is somewhat toxic. Preparation Method In a vacuum or argon atmosphere, sintered at the temperature range of 1200~1300°C with 2mol tungsten powder and 5mol boron powder. Applications 1. For fine chemicals. 2. As a pharmaceutical intermediate or materials intermediate. Toxicity…

Tungsten boride is a silver octahedron crystal with high hardness that dissolves in aqua regia and some concentrated acid. But, it is insoluble in water. Its molecular formula is WB2. WB2 may be obtained by heating metal tungsten and boron with electric furnace. The CAS number of tungsten boride is 234-498-8. The melting point is 2900°C. The density is 10.77g/cm3. And it is decomposed by chlorine under 100°C. The Vickers hardness of WB2 crystals is ~20 GPa. Structure of Tungsten…

Tungsten telluride is a semi-metallic material, which is a gray solid under normal temperature and pressure. It is non-magnetic. Its CAS number is 12067-76-4; Molecular formula is WTe2; Molecular weight is 441.05600; Accurate mass is 445.77900; Density is 9.43g/cm3; Melting point is 1020°C. Recently, WTe2 is predicted to be a Weyl semimetal and, in particular, to be the first example of a “Type II” Weyl semimetal, where the Weyl nodes exist at the intersection of the electron and hole pockets.…

Tungsten silicide is an odorless blue gray tetragonal crystal with CAS number of 12039-88-2, density of 9.88g/cm3, melting point of 900°C, molecular formula of WSi2, and molecular weight of 240.01100. It is insoluble in water and aqua regia. And it dissolved in nitric acid and hydrofluoric acid mixture. Also, it can react violently with substances such as strong acids, fluorine, oxidizers, and interhalogens. Applications 1. Tungsten silicide is an electrically conductive ceramic material. 2. It is used in microelectronics as…

Tungsten selenide is an inorganic compound that can absorb light like graphene. Its CAS No. is 12067-46-8; Molecular formula is WSe2; Molecular weight is 341.77. The light that WSe2 absorbs is used to generate electricity. WSe2 is a very stable semiconductor in the group-VI transition metal dichalcogenides. Structure The compound adopts a hexagonal crystalline structure similar to molybdenum disulfide. Every tungsten atom is covalently bonded to six selenium ligands in a trigonal prismatic coordination sphere while each selenium atom is…