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Mg2AuHg crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Mg2AuHg ribbons oriented in the (1, 0, 0) direction. Mg is bonded in a linear geometry to one Au and one Hg atom. The Mg–Au bond length is 2.60 Å. The Mg–Hg bond length is 2.85 Å. Au is bonded in a linear geometry to two equivalent Mg atoms. Hg is bonded in a linear geometry to two equivalent Mg atoms.
Mg3Au2Hg is Heusler-like structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted body-centered cubic geometry to four equivalent Au and four equivalent Hg atoms. All Mg–Au bond lengths are 2.87 Å. All Mg–Hg bond lengths are 3.00 Å. In the second Mg site, Mg is bonded in a body-centered cubic geometry to eight equivalent Au atoms. All Mg–Au bond lengths are 2.89 Å. Au is bonded in a body-centered cubic geometry to eight Mg atoms. Hg is bonded in a distorted body-centered cubic geometry to eight equivalent Mg atoms.
Mg2AuHg is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to four equivalent Au and four equivalent Hg atoms. All Mg–Au bond lengths are 2.94 Å. All Mg–Hg bond lengths are 2.94 Å. Au is bonded in a body-centered cubic geometry to eight equivalent Mg atoms. Hg is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.