Rb2MnBr4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Rb(1) is bonded in a 9-coordinate geometry to four equivalent Br(2) and five equivalent Br(1) atoms. Mn(1) is bonded to two equivalent Br(1) and four equivalent Br(2) atoms to form corner-sharing MnBr6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded to five equivalent Rb(1) and one Mn(1) atom to form distorted BrRb5Mn octahedra that share corners with five equivalent Br(1)Rb5Mn octahedra, corners with twelve equivalent Br(2)Rb4Mn2 octahedra, edges with eight equivalent Br(1)Rb5Mn octahedra, and faces with four equivalent Br(2)Rb4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the second Br site, Br(2) is bonded to four equivalent Rb(1) and two equivalent Mn(1) atoms to form distorted BrRb4Mn2 octahedra that share corners with two equivalent Br(2)Rb4Mn2 octahedra, corners with twelve equivalent Br(1)Rb5Mn octahedra, edges with two equivalent Br(2)Rb4Mn2 octahedra, faces with four equivalent Br(2)Rb4Mn2 octahedra, and faces with four equivalent Br(1)Rb5Mn octahedra. The corner-sharing octahedral tilt angles range from 0-55°.
Rb2MnBr4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Rb(1) is bonded in a 9-coordinate geometry to four equivalent Br(2) and five equivalent Br(1) atoms. All Rb(1)-Br(2) bond lengths are 3.58 Å. There is one shorter (3.44 Å) and four longer (3.79 Å) Rb(1)-Br(1) bond lengths. Mn(1) is bonded to two equivalent Br(1) and four equivalent Br(2) atoms to form corner-sharing MnBr6 octahedra. The corner-sharing octahedra are not tilted. Both Mn(1)-Br(1) bond lengths are 2.68 Å. All Mn(1)-Br(2) bond lengths are 2.67 Å. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded to five equivalent Rb(1) and one Mn(1) atom to form distorted BrRb5Mn octahedra that share corners with five equivalent Br(1)Rb5Mn octahedra, corners with twelve equivalent Br(2)Rb4Mn2 octahedra, edges with eight equivalent Br(1)Rb5Mn octahedra, and faces with four equivalent Br(2)Rb4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the second Br site, Br(2) is bonded to four equivalent Rb(1) and two equivalent Mn(1) atoms to form distorted BrRb4Mn2 octahedra that share corners with two equivalent Br(2)Rb4Mn2 octahedra, corners with twelve equivalent Br(1)Rb5Mn octahedra, edges with two equivalent Br(2)Rb4Mn2 octahedra, faces with four equivalent Br(2)Rb4Mn2 octahedra, and faces with four equivalent Br(1)Rb5Mn octahedra. The corner-sharing octahedral tilt angles range from 0-55°.