Mg(SnO2)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(4) atoms to form distorted MgO5 square pyramids that share edges with two equivalent Sn(1)O6 octahedra and edges with two equivalent Mg(1)O5 square pyramids. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(4), two equivalent O(2), and three equivalent O(3) atoms to form SnO6 octahedra that share edges with four equivalent Sn(1)O6 octahedra and edges with two equivalent Mg(1)O5 square pyramids. In the second Sn site, Sn(2) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Mg(1) and one Sn(2) atom. In the second O site, O(2) is bonded to one Mg(1), one Sn(2), and two equivalent Sn(1) atoms to form distorted corner-sharing OMgSn3 tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to three equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one Sn(1), and one Sn(2) atom.
Mg(SnO2)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(4) atoms to form distorted MgO5 square pyramids that share edges with two equivalent Sn(1)O6 octahedra and edges with two equivalent Mg(1)O5 square pyramids. The Mg(1)-O(2) bond length is 2.17 Å. There is one shorter (2.01 Å) and one longer (2.02 Å) Mg(1)-O(1) bond length. There is one shorter (2.14 Å) and one longer (2.24 Å) Mg(1)-O(4) bond length. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(4), two equivalent O(2), and three equivalent O(3) atoms to form SnO6 octahedra that share edges with four equivalent Sn(1)O6 octahedra and edges with two equivalent Mg(1)O5 square pyramids. The Sn(1)-O(4) bond length is 2.12 Å. Both Sn(1)-O(2) bond lengths are 2.09 Å. There are a spread of Sn(1)-O(3) bond distances ranging from 2.13-2.22 Å. In the second Sn site, Sn(2) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(4) atom. The Sn(2)-O(1) bond length is 2.04 Å. The Sn(2)-O(2) bond length is 2.54 Å. The Sn(2)-O(4) bond length is 2.14 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Mg(1) and one Sn(2) atom. In the second O site, O(2) is bonded to one Mg(1), one Sn(2), and two equivalent Sn(1) atoms to form distorted corner-sharing OMgSn3 tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to three equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one Sn(1), and one Sn(2) atom.