Rb2CuSbBr6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to twelve equivalent Br(1) atoms to form RbBr12 cuboctahedra that share corners with twelve equivalent Rb(1)Br12 cuboctahedra, faces with six equivalent Rb(1)Br12 cuboctahedra, faces with four equivalent Cu(1)Br6 octahedra, and faces with four equivalent Sb(1)Br6 octahedra. Cu(1) is bonded to six equivalent Br(1) atoms to form CuBr6 octahedra that share corners with six equivalent Sb(1)Br6 octahedra and faces with eight equivalent Rb(1)Br12 cuboctahedra. The corner-sharing octahedra are not tilted. Sb(1) is bonded to six equivalent Br(1) atoms to form SbBr6 octahedra that share corners with six equivalent Cu(1)Br6 octahedra and faces with eight equivalent Rb(1)Br12 cuboctahedra. The corner-sharing octahedra are not tilted. Br(1) is bonded to four equivalent Rb(1), one Cu(1), and one Sb(1) atom to form a mixture of distorted face, corner, and edge-sharing BrRb4CuSb octahedra. The corner-sharing octahedral tilt angles range from 0-60°.
Rb2CuSbBr6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to twelve equivalent Br(1) atoms to form RbBr12 cuboctahedra that share corners with twelve equivalent Rb(1)Br12 cuboctahedra, faces with six equivalent Rb(1)Br12 cuboctahedra, faces with four equivalent Cu(1)Br6 octahedra, and faces with four equivalent Sb(1)Br6 octahedra. All Rb(1)-Br(1) bond lengths are 3.88 Å. Cu(1) is bonded to six equivalent Br(1) atoms to form CuBr6 octahedra that share corners with six equivalent Sb(1)Br6 octahedra and faces with eight equivalent Rb(1)Br12 cuboctahedra. The corner-sharing octahedra are not tilted. All Cu(1)-Br(1) bond lengths are 2.65 Å. Sb(1) is bonded to six equivalent Br(1) atoms to form SbBr6 octahedra that share corners with six equivalent Cu(1)Br6 octahedra and faces with eight equivalent Rb(1)Br12 cuboctahedra. The corner-sharing octahedra are not tilted. All Sb(1)-Br(1) bond lengths are 2.83 Å. Br(1) is bonded to four equivalent Rb(1), one Cu(1), and one Sb(1) atom to form a mixture of distorted face, corner, and edge-sharing BrRb4CuSb octahedra. The corner-sharing octahedral tilt angles range from 0-60°.