Rb2YHgF6 crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to twelve equivalent F(1) atoms to form RbF12 cuboctahedra that share corners with twelve equivalent Rb(1)F12 cuboctahedra, faces with six equivalent Rb(1)F12 cuboctahedra, faces with four equivalent Y(1)F6 octahedra, and faces with four equivalent Hg(1)F6 octahedra. Y(1) is bonded to six equivalent F(1) atoms to form YF6 octahedra that share corners with six equivalent Hg(1)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. Hg(1) is bonded to six equivalent F(1) atoms to form HgF6 octahedra that share corners with six equivalent Y(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 single-bond geometry to four equivalent Rb(1), one Y(1), and one Hg(1) atom.
Rb2YHgF6 crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to twelve equivalent F(1) atoms to form RbF12 cuboctahedra that share corners with twelve equivalent Rb(1)F12 cuboctahedra, faces with six equivalent Rb(1)F12 cuboctahedra, faces with four equivalent Y(1)F6 octahedra, and faces with four equivalent Hg(1)F6 octahedra. All Rb(1)-F(1) bond lengths are 3.38 Å. Y(1) is bonded to six equivalent F(1) atoms to form YF6 octahedra that share corners with six equivalent Hg(1)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. All Y(1)-F(1) bond lengths are 2.18 Å. Hg(1) is bonded to six equivalent F(1) atoms to form HgF6 octahedra that share corners with six equivalent Y(1)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. All Hg(1)-F(1) bond lengths are 2.59 Å. F(1) is bonded in a distorted single-bond geometry to four equivalent Rb(1), one Y(1), and one Hg(1) atom.