Rb2FeHgF6 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 Fe(1)F6 octahedra, and faces with four equivalent Hg(1)F6 octahedra. Fe(1) is bonded to six equivalent F(1) atoms to form FeF6 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 Fe(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 Fe(1), and one Hg(1) atom.
Rb2FeHgF6 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 Fe(1)F6 octahedra, and faces with four equivalent Hg(1)F6 octahedra. All Rb(1)-F(1) bond lengths are 3.22 Å. Fe(1) is bonded to six equivalent F(1) atoms to form FeF6 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 Fe(1)-F(1) bond lengths are 1.96 Å. Hg(1) is bonded to six equivalent F(1) atoms to form HgF6 octahedra that share corners with six equivalent Fe(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 2.57 Å. F(1) is bonded in a distorted single-bond geometry to four equivalent Rb(1), one Fe(1), and one Hg(1) atom.