Cs2SiF6 crystallizes in the cubic Fm-3m space group. Cs(1) is bonded to twelve equivalent F(1) atoms to form distorted CsF12 cuboctahedra that share corners with twelve equivalent Cs(1)F12 cuboctahedra, faces with six equivalent Cs(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 Cs(1)F12 cuboctahedra. F(1) is bonded in a single-bond geometry to four equivalent Cs(1) and one Si(1) atom.
Cs2SiF6 crystallizes in the cubic Fm-3m space group. Cs(1) is bonded to twelve equivalent F(1) atoms to form distorted CsF12 cuboctahedra that share corners with twelve equivalent Cs(1)F12 cuboctahedra, faces with six equivalent Cs(1)F12 cuboctahedra, and faces with four equivalent Si(1)F6 octahedra. All Cs(1)-F(1) bond lengths are 3.16 Å. Si(1) is bonded to six equivalent F(1) atoms to form SiF6 octahedra that share faces with eight equivalent Cs(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 Cs(1) and one Si(1) atom.