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ErHg2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Er is bonded to twelve equivalent Hg atoms to form a mixture of distorted edge and face-sharing ErHg12 cuboctahedra. All Er–Hg bond lengths are 3.33 Å. Hg is bonded in a 9-coordinate geometry to six equivalent Er and three equivalent Hg atoms. All Hg–Hg bond lengths are 2.85 Å.
ErHg3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Er is bonded to twelve equivalent Hg atoms to form a mixture of corner and face-sharing ErHg12 cuboctahedra. There are six shorter (3.15 Å) and six longer (3.32 Å) Er–Hg bond lengths. Hg is bonded in a 4-coordinate geometry to four equivalent Er atoms.