Thallium dibromide, TlBr₂

Thallium dibromide, TlBr₂ or TlBr.TlBr₃, is the final product of the action of dry bromine on dry thallous bromide, and is best prepared by heating thallous bromide with bromine in a sealed tube at 100° for six hours, opening the tube, and removing the excess of bromine by heating. The dibromide is also produced by the action of excess of a chloroform or carbon tetrachloride solution of bromine on thallous bromide, by the prolonged action of an excess of bromine dissolved in carbon disulphide on thallous bromide, and by the decomposition of the hydrates of thallic bromide.

Thallium dibromide is a dark yellow, crystalline solid readily decomposed by water.