ErHg2 crystallizes in the hexagonal P6/mmm space group. Er(1) is bonded to twelve equivalent Hg(1) atoms to form a mixture of distorted face and edge-sharing ErHg12 cuboctahedra. Hg(1) is bonded in a 9-coordinate geometry to six equivalent Er(1) and three equivalent Hg(1) atoms.
ErHg2 crystallizes in the hexagonal P6/mmm space group. Er(1) is bonded to twelve equivalent Hg(1) atoms to form a mixture of distorted face and edge-sharing ErHg12 cuboctahedra. All Er(1)-Hg(1) bond lengths are 3.29 Å. Hg(1) is bonded in a 9-coordinate geometry to six equivalent Er(1) and three equivalent Hg(1) atoms. All Hg(1)-Hg(1) bond lengths are 2.81 Å.