RbTlBr3 is (Cubic) Perovskite structured and crystallizes in the monoclinic Cm space group. Rb(1) is bonded in a 12-coordinate geometry to four equivalent Br(2) and eight equivalent Br(1) atoms. Tl(1) is bonded to two equivalent Br(2) and four equivalent Br(1) atoms to form corner-sharing TlBr6 octahedra. The corner-sharing octahedral tilt angles range from 1-4°. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted linear geometry to four equivalent Rb(1) and two equivalent Tl(1) atoms. In the second Br site, Br(2) is bonded in a distorted linear geometry to four equivalent Rb(1) and two equivalent Tl(1) atoms.
RbTlBr3 is (Cubic) Perovskite structured and crystallizes in the monoclinic Cm space group. Rb(1) is bonded in a 12-coordinate geometry to four equivalent Br(2) and eight equivalent Br(1) atoms. There are a spread of Rb(1)-Br(2) bond distances ranging from 4.03-4.22 Å. There are a spread of Rb(1)-Br(1) bond distances ranging from 4.06-4.19 Å. Tl(1) is bonded to two equivalent Br(2) and four equivalent Br(1) atoms to form corner-sharing TlBr6 octahedra. The corner-sharing octahedral tilt angles range from 1-4°. There is one shorter (2.91 Å) and one longer (2.93 Å) Tl(1)-Br(2) bond length. There are two shorter (2.89 Å) and two longer (2.94 Å) Tl(1)-Br(1) bond lengths. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted linear geometry to four equivalent Rb(1) and two equivalent Tl(1) atoms. In the second Br site, Br(2) is bonded in a distorted linear geometry to four equivalent Rb(1) and two equivalent Tl(1) atoms.