Hg3O2Cl2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 5-coordinate geometry to three equivalent O(1) and two equivalent Cl(1) atoms. In the second Hg site, Hg(2) is bonded in a linear geometry to two equivalent O(1) and four equivalent Cl(1) atoms. O(1) is bonded to one Hg(2) and three equivalent Hg(1) atoms to form a mixture of edge and corner-sharing OHg4 tetrahedra. Cl(1) is bonded in a 4-coordinate geometry to two equivalent Hg(1) and two equivalent Hg(2) atoms.
Hg3O2Cl2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 5-coordinate geometry to three equivalent O(1) and two equivalent Cl(1) atoms. There are a spread of Hg(1)-O(1) bond distances ranging from 2.25-2.42 Å. There is one shorter (2.71 Å) and one longer (2.89 Å) Hg(1)-Cl(1) bond length. In the second Hg site, Hg(2) is bonded in a linear geometry to two equivalent O(1) and four equivalent Cl(1) atoms. Both Hg(2)-O(1) bond lengths are 2.11 Å. There are two shorter (3.07 Å) and two longer (3.08 Å) Hg(2)-Cl(1) bond lengths. O(1) is bonded to one Hg(2) and three equivalent Hg(1) atoms to form a mixture of edge and corner-sharing OHg4 tetrahedra. Cl(1) is bonded in a 4-coordinate geometry to two equivalent Hg(1) and two equivalent Hg(2) atoms.