CsRb2NbF6 crystallizes in the cubic Fm-3m space group. Cs(1) is bonded to six equivalent F(1) atoms to form CsF6 octahedra that share corners with six equivalent Nb(1)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. Rb(1) is bonded to twelve equivalent F(1) atoms to form distorted RbF12 cuboctahedra that share corners with twelve equivalent Rb(1)F12 cuboctahedra, faces with six equivalent Rb(1)F12 cuboctahedra, faces with four equivalent Cs(1)F6 octahedra, and faces with four equivalent Nb(1)F6 octahedra. Nb(1) is bonded to six equivalent F(1) atoms to form NbF6 octahedra that share corners with six equivalent Cs(1)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. F(1) is bonded in a distorted linear geometry to one Cs(1), four equivalent Rb(1), and one Nb(1) atom.
CsRb2NbF6 crystallizes in the cubic Fm-3m space group. Cs(1) is bonded to six equivalent F(1) atoms to form CsF6 octahedra that share corners with six equivalent Nb(1)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. All Cs(1)-F(1) bond lengths are 2.80 Å. Rb(1) is bonded to twelve equivalent F(1) atoms to form distorted RbF12 cuboctahedra that share corners with twelve equivalent Rb(1)F12 cuboctahedra, faces with six equivalent Rb(1)F12 cuboctahedra, faces with four equivalent Cs(1)F6 octahedra, and faces with four equivalent Nb(1)F6 octahedra. All Rb(1)-F(1) bond lengths are 3.49 Å. Nb(1) is bonded to six equivalent F(1) atoms to form NbF6 octahedra that share corners with six equivalent Cs(1)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. All Nb(1)-F(1) bond lengths are 2.11 Å. F(1) is bonded in a distorted linear geometry to one Cs(1), four equivalent Rb(1), and one Nb(1) atom.