RbPb2Br5 crystallizes in the tetragonal I4/mcm space group. Rb(1) is bonded in a distorted q6 geometry to two equivalent Br(2) and eight equivalent Br(1) atoms. Pb(1) is bonded in a 8-coordinate geometry to two equivalent Br(2) and six equivalent Br(1) atoms. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 5-coordinate geometry to two equivalent Rb(1) and three equivalent Pb(1) atoms. In the second Br site, Br(2) is bonded to two equivalent Rb(1) and four equivalent Pb(1) atoms to form corner-sharing BrRb2Pb4 octahedra. The corner-sharing octahedral tilt angles range from 0-37°.
RbPb2Br5 crystallizes in the tetragonal I4/mcm space group. Rb(1) is bonded in a distorted q6 geometry to two equivalent Br(2) and eight equivalent Br(1) atoms. Both Rb(1)-Br(2) bond lengths are 3.72 Å. All Rb(1)-Br(1) bond lengths are 3.64 Å. Pb(1) is bonded in a 8-coordinate geometry to two equivalent Br(2) and six equivalent Br(1) atoms. Both Pb(1)-Br(2) bond lengths are 3.16 Å. There are two shorter (2.91 Å) and four longer (3.38 Å) Pb(1)-Br(1) bond lengths. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 5-coordinate geometry to two equivalent Rb(1) and three equivalent Pb(1) atoms. In the second Br site, Br(2) is bonded to two equivalent Rb(1) and four equivalent Pb(1) atoms to form corner-sharing BrRb2Pb4 octahedra. The corner-sharing octahedral tilt angles range from 0-37°.