Mn2Hg5 crystallizes in the tetragonal P4/mbm space group. Mn(1) is bonded to two equivalent Mn(1), two equivalent Hg(2), and eight equivalent Hg(1) atoms to form a mixture of distorted corner, face, and edge-sharing MnMn2Hg10 cuboctahedra. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 10-coordinate geometry to four equivalent Mn(1), one Hg(2), and five equivalent Hg(1) atoms. In the second Hg site, Hg(2) is bonded in a 10-coordinate geometry to four equivalent Mn(1), two equivalent Hg(2), and four equivalent Hg(1) atoms.
Mn2Hg5 crystallizes in the tetragonal P4/mbm space group. Mn(1) is bonded to two equivalent Mn(1), two equivalent Hg(2), and eight equivalent Hg(1) atoms to form a mixture of distorted corner, face, and edge-sharing MnMn2Hg10 cuboctahedra. Both Mn(1)-Mn(1) bond lengths are 3.02 Å. Both Mn(1)-Hg(2) bond lengths are 2.97 Å. There are four shorter (2.97 Å) and four longer (3.10 Å) Mn(1)-Hg(1) bond lengths. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 10-coordinate geometry to four equivalent Mn(1), one Hg(2), and five equivalent Hg(1) atoms. The Hg(1)-Hg(2) bond length is 3.04 Å. There are four shorter (3.02 Å) and one longer (3.29 Å) Hg(1)-Hg(1) bond length. In the second Hg site, Hg(2) is bonded in a 10-coordinate geometry to four equivalent Mn(1), two equivalent Hg(2), and four equivalent Hg(1) atoms. Both Hg(2)-Hg(2) bond lengths are 3.02 Å.