K2HgAsF6 crystallizes in the cubic Fm-3m space group. 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 Hg(1)F6 octahedra, and faces with four equivalent As(1)F6 octahedra. Hg(1) is bonded to six equivalent F(1) atoms to form distorted HgF6 octahedra that share corners with six equivalent As(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. As(1) is bonded to six equivalent F(1) atoms to form AsF6 octahedra that share corners with six equivalent Hg(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 single-bond geometry to four equivalent K(1), one Hg(1), and one As(1) atom.
K2HgAsF6 crystallizes in the cubic Fm-3m space group. 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 Hg(1)F6 octahedra, and faces with four equivalent As(1)F6 octahedra. All K(1)-F(1) bond lengths are 3.30 Å. Hg(1) is bonded to six equivalent F(1) atoms to form distorted HgF6 octahedra that share corners with six equivalent As(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. All Hg(1)-F(1) bond lengths are 2.64 Å. As(1) is bonded to six equivalent F(1) atoms to form AsF6 octahedra that share corners with six equivalent Hg(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. All As(1)-F(1) bond lengths are 2.01 Å. F(1) is bonded in a single-bond geometry to four equivalent K(1), one Hg(1), and one As(1) atom.