(HO)SbBr [trihydroxonium enneabromidodiantimonate(III)] is the first representative of the MEX family (M = cation, E = Sb and Bi, and X = Br and I) with oxonium cations. The metastable compound was obtained in trace amounts from a solution of CsBr and SbBr in concentrated aqueous HBr. Single crystals were isolated from the mother liquor and investigated by single-crystal X-ray diffraction at 100 K. (HO)SbBr crystallizes with the TlBiI structure type, which is a distorted defect variant of cubic perovskite. The crystal structure comprises characteristic [SbBrBr] double layers of corner-sharing SbBr octahedra with a [001] stacking direction. Due to the small size of the HO cation and O-H...Br hydrogen bonding, the octahedra are tilted.
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