Ammonium hexabromoselenate(IV) is an inorganic chemical compound with the chemical formula .
Synthesis Ammonium bromide is added to aqueous solutions of selenium tetrabromide acidified with hydrogen bromide:
Also, selenium dioxide dissolved in hydrobromic acid and treated with ammonium chloride produces the compound.
Physical properties The compound forms red crystals of the cubic system, space group Fm3m.
The compound decomposes in water.
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