Mg(WO2)2 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form edge-sharing WO6 octahedra. In the second W site, W(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form edge-sharing WO6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one W(1), and two equivalent W(2) atoms. In the second O site, O(2) is bonded to one Mg(2), one W(1), and two equivalent W(2) atoms to form OMgW3 trigonal pyramids that share corners with four equivalent O(3)Mg2W3 trigonal bipyramids, corners with three equivalent O(2)MgW3 trigonal pyramids, and edges with four equivalent O(3)Mg2W3 trigonal bipyramids. In the third O site, O(3) is bonded to one Mg(1), one Mg(2), one W(2), and two equivalent W(1) atoms to form OMg2W3 trigonal bipyramids that share corners with five equivalent O(3)Mg2W3 trigonal bipyramids, corners with two equivalent O(2)MgW3 trigonal pyramids, edges with four equivalent O(3)Mg2W3 trigonal bipyramids, and edges with two equivalent O(2)MgW3 trigonal pyramids.
Mg(WO2)2 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. Both Mg(1)-O(1) bond lengths are 2.06 Å. All Mg(1)-O(3) bond lengths are 2.44 Å. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. Both Mg(2)-O(2) bond lengths are 2.12 Å. All Mg(2)-O(3) bond lengths are 2.45 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form edge-sharing WO6 octahedra. The W(1)-O(1) bond length is 2.21 Å. The W(1)-O(2) bond length is 2.15 Å. There are two shorter (2.17 Å) and two longer (2.27 Å) W(1)-O(3) bond lengths. In the second W site, W(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form edge-sharing WO6 octahedra. Both W(2)-O(1) bond lengths are 2.14 Å. Both W(2)-O(2) bond lengths are 2.23 Å. Both W(2)-O(3) bond lengths are 2.22 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one W(1), and two equivalent W(2) atoms. In the second O site, O(2) is bonded to one Mg(2), one W(1), and two equivalent W(2) atoms to form OMgW3 trigonal pyramids that share corners with four equivalent O(3)Mg2W3 trigonal bipyramids, corners with three equivalent O(2)MgW3 trigonal pyramids, and edges with four equivalent O(3)Mg2W3 trigonal bipyramids. In the third O site, O(3) is bonded to one Mg(1), one Mg(2), one W(2), and two equivalent W(1) atoms to form OMg2W3 trigonal bipyramids that share corners with five equivalent O(3)Mg2W3 trigonal bipyramids, corners with two equivalent O(2)MgW3 trigonal pyramids, edges with four equivalent O(3)Mg2W3 trigonal bipyramids, and edges with two equivalent O(2)MgW3 trigonal pyramids.