With the different reaction conditions, tungsten react with bromine can produce different product. Such as bromine and tungsten react at 600 ℃ can generate WBr6. In other conditions, it is possible to generate tungsten pentabromide and [W5Br6] Br4.
Tungsten hexabromide is a blue-black glossy needles, chemical formula: WBr6, it is commonly used in the synthesis of organic compounds of tungsten. During at work works should to wear chemical goggles, gloves and respirators, etc., and pay attention away from fire to avoid explosion or fire to produce toxic fumes.
Synthesis methods of tungsten hexabromide are:
(1) Using boron tribromide reacts with and tungsten hexachloride to obtain tungsten hexabromide. Or using boron tribromide reacts with tungsten metal to obtain it.
(2) tungsten powder with stoichiometric bromine reacts in a vacuum at 500-800 ℃ sealed tube, to obtain tungsten pentabromide and tungsten hexabromide.

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Tungsten（V） bromide is the inorganic compound with the formula WBr5 and it also be known as tungsten pentabromide. The compound consists of bioctahedral structure with two bridging bromide ligands.
Tungsten pentabromide is the precursor to another tungsten compounds by reduction reactions. For example, tungsten pentabromide can be prepared by reduction with aluminum or tungsten. The WBr4 can be purified by chemical vapor transport. The reaction quotation is: 3 WBr5 + Al → 3 WBr4 + AlBr3. Excess tungsten pentabromide and aluminum tribromide are then by sublimation at 240℃.Tungsten dibromide can then be obtained heating the tetrabromide. At 450-500℃, gaseous tungsten pentabromide is evolved leaving yellow-green residue of WBr2. An analogous method can also be applied to the synthesis of tungsten chloride.
Because it is relatively easy to reduce tungsten pentahalides, they can be used as alternative synthetic routes to tungsten halide adducts. For example reaction of WBr5 with pyridine gives WBr4(py)2. The reaction equation of it is: 2 WBr5 + 7 C5H5N → 2 WBr4(C5H5N)2 + bipyridine + C5H5NHBr.

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Tungsten hexabromide is a blue-black needles crystal, its physical properties are as follows: chemical formula: WBr6, molecular weight: 663.264, relative density: 6.9, melting point: 309 ℃, boiling point: 327 ℃, soluble in carbon disulfide, diethyl ether , insoluble in cold water, hot water decomposition. Tungsten hexabromide easily hydrolyze into tungstic acid in humid air, and decomposes into pentabromide tungsten and bromine. CAS registry number: 13701-86-5. WBr6 can produce tungsten tetrabromide and tungsten pentabromide by disproportionation reaction. It is commonly used in the synthesis tungsten organic compounds.
Tungsten hexabromide should be sealed in storage container, placed in a cool, ventilated, and dry area which has safeguard procedures and away from fire and heat. Besides tungsten hexabromide should be stored separately with oxidant, avoid mixing storage. Keep away from food, drink and animal feed. At the same time the storage room should be equipped with the appropriate variety and quantity of fire equipment and other suitable material for leakage collect.
If tungsten hexabromide leaked first to remove the source of fire to prevent fire or explosion, and use any method to collect leakage with dry media to collect, prevented entering drains. Using water and detergent clean the floor and all the things which contaminated by tungsten hexabromide.

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Tungsten（V）bromide is a kind of brown-black crystals, easy hygroscopic and it also has another name which is tungsten pentabromide. And it is physical properties is: chemical formula: WBr5, molar mass: 583.39 g/mol, melting point: 286℃, boiling point: 333℃. Besides the CAS registry number is 13470-11-6 and PubChem number is 139467. According to X-ray diffraction, the structure for tungsten pentabromide consists of an edge-shared bioctahedron. What’s more the tungsten bromide consists of bioctahedral structure with two bridging bromide ligands.
Tungsten pentabromide is prepare by treating tungsten powder with bromine in the temperature range 650-1000℃. But the product is often contaminated with tungsten hexabromide.

 

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