Thiotrithiazyl Bromide, N₃S₄Br

Thiotrithiazyl Bromide, N₃S₄Br, is obtained by the interaction of nitrogen sulphide, N₄S₄, and "sulphur dibromide," SBr₂, in chloroform solution. In carbon disulphide solution the product obtained has the composition N₄S₅Br. Thiotrithiazyl bromide is also formed when excess of bromine acts on thiotrithiazyl chloride in warm carbon disulphide solution. It is also produced when nitrogen bromosulphide, N₄S₄Br₄, is exposed to the action of moist air. Thiotrithiazyl bromide forms small, yellow, needle-shaped crystals, stable in air. On boiling with water the products are ammonium bromide, sulphur and sulphur dioxide. Hot dilute alkalis yield ammonia, together with the alkali bromide, thiosulphate and sulphide.