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TbHg2 crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one TbHg2 sheet oriented in the (0, 0, 1) direction. Tb is bonded in a distorted hexagonal planar geometry to six equivalent Hg atoms. All Tb–Hg bond lengths are 3.11 Å. Hg is bonded in a distorted trigonal planar geometry to three equivalent Tb atoms.
TbHg2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Tb is bonded in a 10-coordinate geometry to ten equivalent Hg atoms. There are a spread of Tb–Hg bond distances ranging from 3.18–3.36 Å. Hg is bonded in a 8-coordinate geometry to five equivalent Tb and three equivalent Hg atoms. There are two shorter (3.01 Å) and one longer (3.18 Å) Hg–Hg bond lengths.
TbHg2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Tb is bonded to twelve equivalent Hg atoms to form a mixture of distorted edge and face-sharing TbHg12 cuboctahedra. There are six shorter (3.33 Å) and six longer (3.38 Å) Tb–Hg bond lengths. Hg is bonded in a 9-coordinate geometry to six equivalent Tb and three equivalent Hg atoms. All Hg–Hg bond lengths are 2.87 Å.