W2Mo2O5 crystallizes in the tetragonal P4/mmm space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a body-centered cubic geometry to eight equivalent Mo(1) atoms. In the second W site, W(2) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form a mixture of distorted face and corner-sharing WO12 cuboctahedra. Mo(1) is bonded in a 5-coordinate geometry to four equivalent W(1), one O(2), and four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent W(2) and two equivalent Mo(1) atoms to form OMo2W2 tetrahedra that share corners with four equivalent O(2)Mo2W4 octahedra, corners with ten equivalent O(1)Mo2W2 tetrahedra, edges with five equivalent O(1)Mo2W2 tetrahedra, and faces with two equivalent O(2)Mo2W4 octahedra. The corner-sharing octahedral tilt angles are 56°. In the second O site, O(2) is bonded to four equivalent W(2) and two equivalent Mo(1) atoms to form OMo2W4 octahedra that share corners with four equivalent O(2)Mo2W4 octahedra, corners with sixteen equivalent O(1)Mo2W2 tetrahedra, edges with four equivalent O(2)Mo2W4 octahedra, and faces with eight equivalent O(1)Mo2W2 tetrahedra. The corner-sharing octahedra are not tilted.
W2Mo2O5 crystallizes in the tetragonal P4/mmm space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a body-centered cubic geometry to eight equivalent Mo(1) atoms. All W(1)-Mo(1) bond lengths are 3.16 Å. In the second W site, W(2) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form a mixture of distorted face and corner-sharing WO12 cuboctahedra. All W(2)-O(2) bond lengths are 2.61 Å. All W(2)-O(1) bond lengths are 2.32 Å. Mo(1) is bonded in a 5-coordinate geometry to four equivalent W(1), one O(2), and four equivalent O(1) atoms. The Mo(1)-O(2) bond length is 2.30 Å. All Mo(1)-O(1) bond lengths are 2.05 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent W(2) and two equivalent Mo(1) atoms to form OMo2W2 tetrahedra that share corners with four equivalent O(2)Mo2W4 octahedra, corners with ten equivalent O(1)Mo2W2 tetrahedra, edges with five equivalent O(1)Mo2W2 tetrahedra, and faces with two equivalent O(2)Mo2W4 octahedra. The corner-sharing octahedral tilt angles are 56°. In the second O site, O(2) is bonded to four equivalent W(2) and two equivalent Mo(1) atoms to form OMo2W4 octahedra that share corners with four equivalent O(2)Mo2W4 octahedra, corners with sixteen equivalent O(1)Mo2W2 tetrahedra, edges with four equivalent O(2)Mo2W4 octahedra, and faces with eight equivalent O(1)Mo2W2 tetrahedra. The corner-sharing octahedra are not tilted.