WO2 crystallizes in the monoclinic Cm space group. There are nine inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one W(9)O4 tetrahedra, corners with two equivalent W(6)O4 tetrahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. In the second W site, W(2) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(5) atoms to form WO6 octahedra that share  a cornercorner with one W(9)O4 tetrahedra, corners with two equivalent W(6)O4 tetrahedra, and edges with four equivalent W(1)O6 octahedra. In the third W site, W(3) is bonded to one O(11), one O(12), one O(14), one O(4), one O(6), and one O(9) atom to form distorted WO6 octahedra that share  a cornercorner with one W(6)O4 tetrahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. In the fourth W site, W(4) is bonded to one O(14), one O(6), two equivalent O(11), and two equivalent O(4) atoms to form distorted WO6 octahedra that share  a cornercorner with one W(6)O4 tetrahedra,  an edgeedge with one W(5)O6 octahedra, and edges with four equivalent W(3)O6 octahedra. In the fifth W site, W(5) is bonded to one O(12), one O(15), two equivalent O(10), and two equivalent O(11) atoms to form edge-sharing WO6 octahedra. In the sixth W site, W(6) is bonded to one O(14), one O(7), and two equivalent O(5) atoms to form corner-sharing WO4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-60°. In the seventh W site, W(7) is bonded to one O(10), one O(13), one O(15), one O(16), one O(17), and one O(18) atom to form WO6 octahedra that share corners with two equivalent W(9)O4 tetrahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(7)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. In the eighth W site, W(8) is bonded to one O(13), one O(18), two equivalent O(10), and two equivalent O(16) atoms to form distorted WO6 octahedra that share corners with two equivalent W(9)O4 tetrahedra,  an edgeedge with one W(5)O6 octahedra, and edges with four equivalent W(7)O6 octahedra. In the ninth W site, W(9) is bonded to one O(17), one O(8), and two equivalent O(16) atoms to form corner-sharing WO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-60°. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one W(1) and one W(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one W(2) and two equivalent W(1) atoms. In the third O site, O(3) is bonded in a water-like geometry to two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a water-like geometry to one W(3) and one W(4) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one W(1), one W(2), and one W(6) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one W(4) and two equivalent W(3) atoms. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one W(6) and two equivalent W(1) atoms. In the eighth O site, O(8) is bonded in a distorted tetrahedral geometry to one W(2), one W(9), and two equivalent W(1) atoms. In the ninth O site, O(9) is bonded in a water-like geometry to two equivalent W(3) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one W(5), one W(7), and one W(8) atom. In the eleventh O site, O(11) is bonded in a trigonal non-coplanar geometry to one W(3), one W(4), and one W(5) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one W(5) and two equivalent W(3) atoms. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one W(8) and two equivalent W(7) atoms. In the fourteenth O site, O(14) is bonded in a distorted trigonal pyramidal geometry to one W(4), one W(6), and two equivalent W(3) atoms. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one W(5) and two equivalent W(7) atoms. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one W(7), one W(8), and one W(9) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one W(9) and two equivalent W(7) atoms. In the eighteenth O site, O(18) is bonded in a trigonal non-coplanar geometry to one W(8) and two equivalent W(7) atoms.
WO2 crystallizes in the monoclinic Cm space group. There are nine inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one W(9)O4 tetrahedra, corners with two equivalent W(6)O4 tetrahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. The W(1)-O(1) bond length is 2.00 Å. The W(1)-O(2) bond length is 2.10 Å. The W(1)-O(3) bond length is 1.99 Å. The W(1)-O(5) bond length is 2.16 Å. The W(1)-O(7) bond length is 2.17 Å. The W(1)-O(8) bond length is 2.26 Å. In the second W site, W(2) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(5) atoms to form WO6 octahedra that share  a cornercorner with one W(9)O4 tetrahedra, corners with two equivalent W(6)O4 tetrahedra, and edges with four equivalent W(1)O6 octahedra. The W(2)-O(2) bond length is 2.10 Å. The W(2)-O(8) bond length is 2.26 Å. Both W(2)-O(1) bond lengths are 1.98 Å. Both W(2)-O(5) bond lengths are 2.19 Å. In the third W site, W(3) is bonded to one O(11), one O(12), one O(14), one O(4), one O(6), and one O(9) atom to form distorted WO6 octahedra that share  a cornercorner with one W(6)O4 tetrahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. The W(3)-O(11) bond length is 2.11 Å. The W(3)-O(12) bond length is 2.13 Å. The W(3)-O(14) bond length is 2.33 Å. The W(3)-O(4) bond length is 2.00 Å. The W(3)-O(6) bond length is 2.13 Å. The W(3)-O(9) bond length is 1.98 Å. In the fourth W site, W(4) is bonded to one O(14), one O(6), two equivalent O(11), and two equivalent O(4) atoms to form distorted WO6 octahedra that share  a cornercorner with one W(6)O4 tetrahedra,  an edgeedge with one W(5)O6 octahedra, and edges with four equivalent W(3)O6 octahedra. The W(4)-O(14) bond length is 2.25 Å. The W(4)-O(6) bond length is 2.02 Å. Both W(4)-O(11) bond lengths are 2.09 Å. Both W(4)-O(4) bond lengths are 1.95 Å. In the fifth W site, W(5) is bonded to one O(12), one O(15), two equivalent O(10), and two equivalent O(11) atoms to form edge-sharing WO6 octahedra. The W(5)-O(12) bond length is 2.06 Å. The W(5)-O(15) bond length is 2.07 Å. Both W(5)-O(10) bond lengths are 2.11 Å. Both W(5)-O(11) bond lengths are 2.13 Å. In the sixth W site, W(6) is bonded to one O(14), one O(7), and two equivalent O(5) atoms to form corner-sharing WO4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-60°. The W(6)-O(14) bond length is 2.05 Å. The W(6)-O(7) bond length is 2.00 Å. Both W(6)-O(5) bond lengths are 1.99 Å. In the seventh W site, W(7) is bonded to one O(10), one O(13), one O(15), one O(16), one O(17), and one O(18) atom to form WO6 octahedra that share corners with two equivalent W(9)O4 tetrahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(7)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. The W(7)-O(10) bond length is 2.05 Å. The W(7)-O(13) bond length is 2.07 Å. The W(7)-O(15) bond length is 2.14 Å. The W(7)-O(16) bond length is 2.16 Å. The W(7)-O(17) bond length is 2.19 Å. The W(7)-O(18) bond length is 2.05 Å. In the eighth W site, W(8) is bonded to one O(13), one O(18), two equivalent O(10), and two equivalent O(16) atoms to form distorted WO6 octahedra that share corners with two equivalent W(9)O4 tetrahedra,  an edgeedge with one W(5)O6 octahedra, and edges with four equivalent W(7)O6 octahedra. The W(8)-O(13) bond length is 2.21 Å. The W(8)-O(18) bond length is 2.16 Å. Both W(8)-O(10) bond lengths are 2.17 Å. Both W(8)-O(16) bond lengths are 2.23 Å. In the ninth W site, W(9) is bonded to one O(17), one O(8), and two equivalent O(16) atoms to form corner-sharing WO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-60°. The W(9)-O(17) bond length is 1.97 Å. The W(9)-O(8) bond length is 2.05 Å. Both W(9)-O(16) bond lengths are 1.97 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one W(1) and one W(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one W(2) and two equivalent W(1) atoms. In the third O site, O(3) is bonded in a water-like geometry to two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a water-like geometry to one W(3) and one W(4) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one W(1), one W(2), and one W(6) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one W(4) and two equivalent W(3) atoms. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one W(6) and two equivalent W(1) atoms. In the eighth O site, O(8) is bonded in a distorted tetrahedral geometry to one W(2), one W(9), and two equivalent W(1) atoms. In the ninth O site, O(9) is bonded in a water-like geometry to two equivalent W(3) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one W(5), one W(7), and one W(8) atom. In the eleventh O site, O(11) is bonded in a trigonal non-coplanar geometry to one W(3), one W(4), and one W(5) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one W(5) and two equivalent W(3) atoms. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one W(8) and two equivalent W(7) atoms. In the fourteenth O site, O(14) is bonded in a distorted trigonal pyramidal geometry to one W(4), one W(6), and two equivalent W(3) atoms. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one W(5) and two equivalent W(7) atoms. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one W(7), one W(8), and one W(9) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one W(9) and two equivalent W(7) atoms. In the eighteenth O site, O(18) is bonded in a trigonal non-coplanar geometry to one W(8) and two equivalent W(7) atoms.