Rb2SiF6 crystallizes in the cubic Fm-3m space group. 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, and faces with four equivalent Si(1)F6 octahedra. Si(1) is bonded to six equivalent F(1) atoms to form SiF6 octahedra that share faces with eight equivalent Rb(1)F12 cuboctahedra. F(1) is bonded in a single-bond geometry to four equivalent Rb(1) and one Si(1) atom.
Rb2SiF6 crystallizes in the cubic Fm-3m space group. 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, and faces with four equivalent Si(1)F6 octahedra. All Rb(1)-F(1) bond lengths are 2.98 Å. Si(1) is bonded to six equivalent F(1) atoms to form SiF6 octahedra that share faces with eight equivalent Rb(1)F12 cuboctahedra. All Si(1)-F(1) bond lengths are 1.70 Å. F(1) is bonded in a single-bond geometry to four equivalent Rb(1) and one Si(1) atom.