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CeHg2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ce is bonded to twelve equivalent Hg atoms to form a mixture of distorted edge and face-sharing CeHg12 cuboctahedra. All Ce–Hg bond lengths are 3.40 Å. Hg is bonded in a 9-coordinate geometry to six equivalent Ce and three equivalent Hg atoms. All Hg–Hg bond lengths are 2.94 Å.
HgCe is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ce is bonded in a body-centered cubic geometry to eight equivalent Hg atoms. All Ce–Hg bond lengths are 3.32 Å. Hg is bonded in a body-centered cubic geometry to eight equivalent Ce atoms.
CeHg3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Ce is bonded to twelve Hg atoms to form a mixture of face and corner-sharing CeHg12 cuboctahedra. There are a spread of Ce–Hg bond distances ranging from 3.23–3.44 Å. There are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a 4-coordinate geometry to four equivalent Ce atoms. In the second Hg site, Hg is bonded in a 4-coordinate geometry to four equivalent Ce atoms.