Tunsgten Pentabromide (2)

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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