MgAg2(HgO2)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form corner-sharing MgO4 tetrahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a distorted T-shaped geometry to one O(2) and two equivalent O(3) atoms. In the second Ag site, Ag(2) is bonded in a linear geometry to one O(1) and one O(2) atom. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a linear geometry to one O(3) and one O(4) atom. In the second Hg site, Hg(2) is bonded in a distorted linear geometry to one O(1) and one O(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Ag(2), and one Hg(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ag(1), one Ag(2), and one Hg(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Ag(1), and one Hg(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one Hg(1) atom.
MgAg2(HgO2)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form corner-sharing MgO4 tetrahedra. The Mg(1)-O(1) bond length is 1.99 Å. The Mg(1)-O(3) bond length is 2.00 Å. There is one shorter (2.03 Å) and one longer (2.05 Å) Mg(1)-O(4) bond length. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a distorted T-shaped geometry to one O(2) and two equivalent O(3) atoms. The Ag(1)-O(2) bond length is 2.17 Å. There is one shorter (2.19 Å) and one longer (2.62 Å) Ag(1)-O(3) bond length. In the second Ag site, Ag(2) is bonded in a linear geometry to one O(1) and one O(2) atom. The Ag(2)-O(1) bond length is 2.09 Å. The Ag(2)-O(2) bond length is 2.09 Å. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a linear geometry to one O(3) and one O(4) atom. The Hg(1)-O(3) bond length is 2.04 Å. The Hg(1)-O(4) bond length is 2.05 Å. In the second Hg site, Hg(2) is bonded in a distorted linear geometry to one O(1) and one O(2) atom. The Hg(2)-O(1) bond length is 2.06 Å. The Hg(2)-O(2) bond length is 2.06 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Ag(2), and one Hg(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ag(1), one Ag(2), and one Hg(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Ag(1), and one Hg(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one Hg(1) atom.