Materials Data on Sr2Cu3(BrO2)2 by Materials Project
Sr2Cu3O4Br2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr2+ is bonded in a 8-coordinate geometry to four equivalent O2- and four equivalent Br1- atoms. All Sr–O bond lengths are 2.65 Å. All Sr–Br bond lengths are 3.21 Å. There are two inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Cu–O bond lengths are 1.95 Å. In the second Cu2+ site, Cu2+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Cu–O bond lengths are 1.95 Å. O2- is bonded to two equivalent Sr2+ and three Cu2+ atoms to form distorted OSr2Cu3 trigonal bipyramids that share corners with eight equivalent BrSr4 tetrahedra, corners with three equivalent OSr2Cu3 trigonal bipyramids, edges with three equivalent OSr2Cu3 trigonal bipyramids, and faces with two equivalent OSr2Cu3 trigonal bipyramids. Br1- is bonded to four equivalent Sr2+ atoms to form distorted BrSr4 tetrahedra that share corners with four equivalent BrSr4 tetrahedra, corners with sixteen equivalent OSr2Cu3 trigonal bipyramids, and edges with four equivalent BrSr4 tetrahedra.