Like tungsten hexachloride (WCl6), tungsten hexabromide is also a inorganic compound composed of transition metal tungsten and halogen elements. The valence of tungsten is+6, which has good physical and chemical properties and is widely used in chemical engineering, catalysis and other fields. Note: Bromine and chlorine belong to halogen group elements, with atomic number of 35 and 17 respectively.
Tungsten hexabromide is a bromide of tungsten, a dark gray powder or a light gray solid with metallic luster, English name Tungsten Hexafluoride, chemical formula WBr6, molecular weight 663.26, CAS number 13701-86-5, PubChem 14440251.
In terms of structure, the tungsten hexabromide structure is a triangular crystal system, with lattice constants a of 639.4pm and c of 1753pm. It is composed of WBr6 octahedron. The tungsten atom is located in the center, surrounded by six bromine atoms. Each bromine atom is connected to the tungsten atom by covalent bond, but the bromine atoms are not connected with each other directly by chemical bond
In terms of physical and chemical properties, tungsten hexabromide appears as a dark gray powder or light gray solid, with a density of 6.9g/cm3 and a melting point of about 232 ° C. It is soluble in carbon disulfide, ether, carbon disulfide, ammonia and acid, insoluble in cold water, but easily decomposes into tungstic acid in hot water. Under heating conditions, it easily decomposes into tungsten pentabromide and bromine, with strong reducibility, and will slowly react with dry oxygen to release bromine.
In terms of production, tungsten hexabromide can be formed by reacting tungsten pentabromide with bromine in a protective atmosphere without oxygen; By reacting hexacarbonyl tungsten with bromine; Formed by combining tungsten hexachloride with boron tribromide; Directly reacting tungsten metal or tungsten oxide with bromine at high temperature; Alternatively, soluble tungsten tetrabromide and tungsten pentabromide can be prepared first, and then reacted with bromine to form them.
In terms of usage, tungsten hexabromide can be used to prepare other tungsten compounds, such as tungsten fluoride, tungsten dibromide, etc; Catalysts, brominating agents, etc. used in the synthesis of organic compounds and petroleum chemistry; Used for manufacturing developers, dyes, pharmaceuticals, etc; Manufacturing new light sources, brominated tungsten lamps are very bright and small in size, and can be used for movies, photography, stage lighting, and other aspects.
Post time: May-18-2023