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MnHg is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mn is bonded in a body-centered cubic geometry to eight equivalent Hg atoms. All Mn–Hg bond lengths are 2.88 Å. Hg is bonded in a body-centered cubic geometry to eight equivalent Mn atoms.
Mn2Hg5 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. Mn is bonded to two equivalent Mn and ten Hg atoms to form a mixture of distorted corner, edge, and face-sharing MnMn2Hg10 cuboctahedra. Both Mn–Mn bond lengths are 3.02 Å. There are six shorter (2.97 Å) and four longer (3.10 Å) Mn–Hg bond lengths. There are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a 10-coordinate geometry to four equivalent Mn and six Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.02–3.29 Å. In the second Hg site, Hg is bonded in a 10-coordinate geometry to four equivalent Mn and six Hg atoms. Both Hg–Hg bond lengths are 3.02 Å.
Mn3Hg is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mn is bonded to eight equivalent Mn and four equivalent Hg atoms to form distorted MnMn8Hg4 cuboctahedra that share corners with twelve equivalent MnMn8Hg4 cuboctahedra, edges with eight equivalent HgMn12 cuboctahedra, edges with sixteen equivalent MnMn8Hg4 cuboctahedra, faces with four equivalent HgMn12 cuboctahedra, and faces with fourteen equivalent MnMn8Hg4 cuboctahedra. All Mn–Mn bond lengths are 2.84 Å. All Mn–Hg bond lengths are 2.84 Å. Hg is bonded to twelve equivalent Mn atoms to form HgMn12 cuboctahedra that share corners with twelve equivalent HgMn12 cuboctahedra, edges with twenty-four equivalent MnMn8Hg4 cuboctahedra, faces with six equivalent HgMn12 cuboctahedra, and faces with twelve equivalent MnMn8Hg4 cuboctahedra.
MnHg3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mn is bonded to twelve equivalent Hg atoms to form MnHg12 cuboctahedra that share corners with twelve equivalent MnHg12 cuboctahedra, edges with twenty-four equivalent HgMn4Hg8 cuboctahedra, faces with six equivalent MnHg12 cuboctahedra, and faces with twelve equivalent HgMn4Hg8 cuboctahedra. All Mn–Hg bond lengths are 3.12 Å. Hg is bonded to four equivalent Mn and eight equivalent Hg atoms to form distorted HgMn4Hg8 cuboctahedra that share corners with twelve equivalent HgMn4Hg8 cuboctahedra, edges with eight equivalent MnHg12 cuboctahedra, edges with sixteen equivalent HgMn4Hg8 cuboctahedra, faces with four equivalent MnHg12 cuboctahedra, and faces with fourteen equivalent HgMn4Hg8 cuboctahedra. All Hg–Hg bond lengths are 3.12 Å.