Rb2KAlI6 crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to twelve equivalent I(1) atoms to form distorted RbI12 cuboctahedra that share corners with twelve equivalent Rb(1)I12 cuboctahedra, faces with six equivalent Rb(1)I12 cuboctahedra, faces with four equivalent K(1)I6 octahedra, and faces with four equivalent Al(1)I6 octahedra. K(1) is bonded to six equivalent I(1) atoms to form KI6 octahedra that share corners with six equivalent Al(1)I6 octahedra and faces with eight equivalent Rb(1)I12 cuboctahedra. The corner-sharing octahedra are not tilted. Al(1) is bonded to six equivalent I(1) atoms to form AlI6 octahedra that share corners with six equivalent K(1)I6 octahedra and faces with eight equivalent Rb(1)I12 cuboctahedra. The corner-sharing octahedra are not tilted. I(1) is bonded in a linear geometry to four equivalent Rb(1), one K(1), and one Al(1) atom.
Rb2KAlI6 crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to twelve equivalent I(1) atoms to form distorted RbI12 cuboctahedra that share corners with twelve equivalent Rb(1)I12 cuboctahedra, faces with six equivalent Rb(1)I12 cuboctahedra, faces with four equivalent K(1)I6 octahedra, and faces with four equivalent Al(1)I6 octahedra. All Rb(1)-I(1) bond lengths are 4.36 Å. K(1) is bonded to six equivalent I(1) atoms to form KI6 octahedra that share corners with six equivalent Al(1)I6 octahedra and faces with eight equivalent Rb(1)I12 cuboctahedra. The corner-sharing octahedra are not tilted. All K(1)-I(1) bond lengths are 3.37 Å. Al(1) is bonded to six equivalent I(1) atoms to form AlI6 octahedra that share corners with six equivalent K(1)I6 octahedra and faces with eight equivalent Rb(1)I12 cuboctahedra. The corner-sharing octahedra are not tilted. All Al(1)-I(1) bond lengths are 2.78 Å. I(1) is bonded in a linear geometry to four equivalent Rb(1), one K(1), and one Al(1) atom.