Barium Perbromides

The compound BaBr₆ is slowly formed when anhydrous bromine acts upon barium bromide.

Solutions of barium bromide take up bromine, and experiments on the distribution of bromine between an aqueous barium bromide solution and a solvent immiscible with it, show that combination has taken place. In solutions in which the barium bromide concentration was 0.09936 grm.-mol. per litre, the value of the dissociation constant for barium tetrabromide varied between 0.031 and 0.045 at 25° C.

If perbromides exist in the solid state they are very unstable.