Tungsten Hexabromide, WBr₆

Tungsten Hexabromide, WBr₆, is formed, in total absence of air and of moisture, by gently heating tungsten in bromine vapour in an atmosphere of nitrogen. It sublimes, forming bluish-black needles which readily decompose on heating. It fumes in the air and is decomposed by water with formation of a blue oxide and hydrobromic acid.