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MgHg3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mg is bonded to twelve equivalent Hg atoms to form a mixture of corner and face-sharing MgHg12 cuboctahedra. All Mg–Hg bond lengths are 3.25 Å. Hg is bonded in a distorted square co-planar geometry to four equivalent Mg atoms.
MgHg5 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Mg is bonded in a 12-coordinate geometry to twelve Hg atoms. There are six shorter (3.07 Å) and six longer (3.51 Å) Mg–Hg bond lengths. There are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a distorted water-like geometry to two equivalent Mg and four equivalent Hg atoms. All Hg–Hg bond lengths are 3.21 Å. In the second Hg site, Hg is bonded in a 9-coordinate geometry to three equivalent Mg and six equivalent Hg atoms.
MgHg3 is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Mg is bonded to eleven Hg atoms to form a mixture of distorted edge and face-sharing MgHg11 trigonal bipyramids. There are a spread of Mg–Hg bond distances ranging from 2.93–3.34 Å. There are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a distorted single-bond geometry to four equivalent Mg atoms. In the second Hg site, Hg is bonded in a trigonal planar geometry to three equivalent Mg atoms.
MgHg2 is Titanium Disilicide structured and crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Mg is bonded in a distorted q6 geometry to ten equivalent Hg atoms. There are a spread of Mg–Hg bond distances ranging from 3.06–3.25 Å. Hg is bonded in a 5-coordinate geometry to five equivalent Mg atoms.
Mg5Hg crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded to ten Mg and two equivalent Hg atoms to form distorted MgMg10Hg2 cuboctahedra that share corners with eighteen equivalent MgMg10Hg2 cuboctahedra, edges with four equivalent HgMg12 cuboctahedra, edges with fourteen MgMg10Hg2 cuboctahedra, faces with four equivalent HgMg12 cuboctahedra, and faces with sixteen MgMg10Hg2 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.07–3.18 Å. Both Mg–Hg bond lengths are 3.16 Å. In the second Mg site, Mg is bonded to nine Mg and three equivalent Hg atoms to form distorted MgMg9Hg3 cuboctahedra that share corners with nine equivalent MgMg9Hg3 cuboctahedra, corners with nine equivalent HgMg12 cuboctahedra, edges with eighteen MgMg10Hg2 cuboctahedra, faces with three equivalent HgMg12 cuboctahedra, and faces with seventeen MgMg10Hg2 cuboctahedra. All Mg–Mg bond lengths are 3.12 Å. All Mg–Hg bond lengths are 3.12 Å. Hg is bonded to twelve Mg atoms to form HgMg12 cuboctahedra that share corners with eighteen equivalent MgMg9Hg3 cuboctahedra, edges with six equivalent HgMg12 cuboctahedra, edges with twelve equivalent MgMg10Hg2 cuboctahedra, faces with two equivalent HgMg12 cuboctahedra, and faces with eighteen MgMg10Hg2 cuboctahedra.