RbK2NbF6 crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to six equivalent F(1) atoms to form RbF6 octahedra that share corners with six equivalent Nb(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. K(1) is bonded to twelve equivalent F(1) atoms to form distorted KF12 cuboctahedra that share corners with twelve equivalent K(1)F12 cuboctahedra, faces with six equivalent K(1)F12 cuboctahedra, faces with four equivalent Rb(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 Rb(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. F(1) is bonded in a linear geometry to one Rb(1), four equivalent K(1), and one Nb(1) atom.
RbK2NbF6 crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to six equivalent F(1) atoms to form RbF6 octahedra that share corners with six equivalent Nb(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. All Rb(1)-F(1) bond lengths are 2.63 Å. K(1) is bonded to twelve equivalent F(1) atoms to form distorted KF12 cuboctahedra that share corners with twelve equivalent K(1)F12 cuboctahedra, faces with six equivalent K(1)F12 cuboctahedra, faces with four equivalent Rb(1)F6 octahedra, and faces with four equivalent Nb(1)F6 octahedra. All K(1)-F(1) bond lengths are 3.36 Å. Nb(1) is bonded to six equivalent F(1) atoms to form NbF6 octahedra that share corners with six equivalent Rb(1)F6 octahedra and faces with eight equivalent K(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 linear geometry to one Rb(1), four equivalent K(1), and one Nb(1) atom.