Nitrogen Bromosulphide, N₄S₄Br₄

When nitrogen sulphide is treated with bromine in carbon disulphide solution, bronze-coloured crystals of Nitrogen Bromosulphide, N₄S₄Br₄, are obtained. This compound decomposes in moist air, forming a yellow, amorphous compound, of composition N₄S₅Br₂, perhaps N₄S₄.SBr₂. Nitrogen sulphide also absorbs bromine vapour, forming red crystals having the composition N₄S₄Br₆. This latter is a very unstable compound; carbon disulphide deprives it of some bromine, and it decomposes in moist air with formation of the yellow compound N₄S₅Br₂. With nitrogen peroxide in carbon disulphide solution it yields crystals of a compound NSO₄, which is decomposed by water into nitric oxide and sulphuric acid. If nitrogen bromosulphide, N₄S₄Br₄, is digested with nitrogen peroxide in carbon disulphide solution, yellow crystals are formed, apparently of composition NSO, but very unstable, gentle heat causing complete decomposition. Similar treatment with nitrogen peroxide converts the compound N₄S₅Br₂ into N₄S₃O₆, which yields large yellow crystals.