title: (H3O)3Sb2Br9: the first member of the M3E2X9structure family with oxonium cations.
abstract: (H3O)3Sb2Br9[trihydroxonium enneabromidodiantimonate(III)] is the first representative of the M3E2X9family (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 SbBr3in concentrated aqueous HBr. Single crystals were isolated from the mother liquor and investigated by single-crystal X-ray diffraction at 100 K. (H3O)3Sb2Br9crystallizes with the Tl3Bi2I9structure type, which is a distorted defect variant of cubic perovskite. The crystal structure comprises characteristic2∞[SbBr3Br3/2] double layers of corner-sharing SbBr6octahedra with a [001] stacking direction. Due to the small size of the H3O+cation and O-H...Br hydrogen bonding, the octahedra are tilted.
authors.affiliation: Department of Chemistry and Food Chemistry, Technische Universitt Dresden, Helmholtzstrasse 10, Dresden, Sachsen 01069, Germany.
authors.forename: Jen Hui
authors.initials: JH
authors.lastname: Chang
authors.affiliation: Department of Chemistry and Food Chemistry, Technische Universitt Dresden, Helmholtzstrasse 10, Dresden, Sachsen 01069, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Doert
authors.affiliation: Department of Chemistry and Food Chemistry, Technische Universitt Dresden, Helmholtzstrasse 10, Dresden, Sachsen 01069, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Ruck
keywords: Tl3Bi2I9 structure type; crystal structure; defect perovskite structure; hydrogen bonding; oxonium cations; sphere close AX3 packing