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SmHg2 crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one SmHg2 sheet oriented in the (0, 0, 1) direction. Sm is bonded in a distorted hexagonal planar geometry to six equivalent Hg atoms. All Sm–Hg bond lengths are 3.15 Å. Hg is bonded in a distorted trigonal planar geometry to three equivalent Sm atoms.
SmHg2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Sm is bonded to twelve equivalent Hg atoms to form a mixture of edge and face-sharing SmHg12 cuboctahedra. All Sm–Hg bond lengths are 3.38 Å. Hg is bonded in a 9-coordinate geometry to six equivalent Sm and three equivalent Hg atoms. All Hg–Hg bond lengths are 2.87 Å.
SmHg2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Sm is bonded to eight equivalent Hg atoms to form edge-sharing SmHg8 hexagonal bipyramids. There are a spread of Sm–Hg bond distances ranging from 3.17–3.20 Å. Hg is bonded in a 4-coordinate geometry to four equivalent Sm atoms.