Caesium tribromide is an inorganic compound with chemical formula . It can be obtained by crystallization from a concentrated aqueous solution of caesium bromide containing large amounts of bromine, or by the hydrothermal reaction of caesium bromide, caesium bromate, and hydrobromic acid, in which bromine is generated in situ.
It is isostructural with caesium triiodide and caesium diiodide bromide, and belongs to the orthorhombic Pmnb space group.
It can oxidize some Au(I) complexes to Au(II) or Au(III) complexes.
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