K2NiHgF6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. K(1) is bonded to twelve equivalent F(1) atoms to form KF12 cuboctahedra that share corners with twelve equivalent K(1)F12 cuboctahedra, faces with six equivalent K(1)F12 cuboctahedra, faces with four equivalent Ni(1)F6 octahedra, and faces with four equivalent Hg(1)F6 octahedra. Ni(1) is bonded to six equivalent F(1) atoms to form NiF6 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. Hg(1) is bonded to six equivalent F(1) atoms to form HgF6 octahedra that share corners with six equivalent Ni(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. F(1) is bonded to four equivalent K(1), one Ni(1), and one Hg(1) atom to form a mixture of distorted edge, face, and corner-sharing FK4NiHg octahedra. The corner-sharing octahedral tilt angles range from 0-60°.
K2NiHgF6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. K(1) is bonded to twelve equivalent F(1) atoms to form KF12 cuboctahedra that share corners with twelve equivalent K(1)F12 cuboctahedra, faces with six equivalent K(1)F12 cuboctahedra, faces with four equivalent Ni(1)F6 octahedra, and faces with four equivalent Hg(1)F6 octahedra. All K(1)-F(1) bond lengths are 3.06 Å. Ni(1) is bonded to six equivalent F(1) atoms to form NiF6 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 Ni(1)-F(1) bond lengths are 2.01 Å. Hg(1) is bonded to six equivalent F(1) atoms to form HgF6 octahedra that share corners with six equivalent Ni(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 2.31 Å. F(1) is bonded to four equivalent K(1), one Ni(1), and one Hg(1) atom to form a mixture of distorted edge, face, and corner-sharing FK4NiHg octahedra. The corner-sharing octahedral tilt angles range from 0-60°.