K2W2O5 crystallizes in the orthorhombic Ima2 space group. K(1) is bonded in a 8-coordinate geometry to one O(3), three equivalent O(2), and four equivalent O(1) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form WO6 octahedra that share corners with four equivalent W(1)O6 octahedra and corners with two equivalent W(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 8°. In the second W site, W(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form WO4 tetrahedra that share corners with two equivalent W(1)O6 octahedra and corners with two equivalent W(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 28°. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent K(1) and two equivalent W(1) atoms to form OK4W2 octahedra that share corners with two equivalent O(1)K4W2 octahedra, corners with four equivalent O(3)K2W2 tetrahedra, edges with two equivalent O(1)K4W2 octahedra, and faces with four equivalent O(1)K4W2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent K(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded to two equivalent K(1) and two equivalent W(2) atoms to form distorted OK2W2 tetrahedra that share corners with eight equivalent O(1)K4W2 octahedra and corners with two equivalent O(3)K2W2 tetrahedra. The corner-sharing octahedral tilt angles range from 19-83°.
K2W2O5 crystallizes in the orthorhombic Ima2 space group. K(1) is bonded in a 8-coordinate geometry to one O(3), three equivalent O(2), and four equivalent O(1) atoms. The K(1)-O(3) bond length is 2.62 Å. There are a spread of K(1)-O(2) bond distances ranging from 2.68-3.10 Å. There are a spread of K(1)-O(1) bond distances ranging from 2.66-2.77 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form WO6 octahedra that share corners with four equivalent W(1)O6 octahedra and corners with two equivalent W(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 8°. Both W(1)-O(2) bond lengths are 2.21 Å. There are two shorter (2.09 Å) and two longer (2.11 Å) W(1)-O(1) bond lengths. In the second W site, W(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form WO4 tetrahedra that share corners with two equivalent W(1)O6 octahedra and corners with two equivalent W(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 28°. Both W(2)-O(2) bond lengths are 1.96 Å. There is one shorter (1.92 Å) and one longer (2.04 Å) W(2)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent K(1) and two equivalent W(1) atoms to form OK4W2 octahedra that share corners with two equivalent O(1)K4W2 octahedra, corners with four equivalent O(3)K2W2 tetrahedra, edges with two equivalent O(1)K4W2 octahedra, and faces with four equivalent O(1)K4W2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent K(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded to two equivalent K(1) and two equivalent W(2) atoms to form distorted OK2W2 tetrahedra that share corners with eight equivalent O(1)K4W2 octahedra and corners with two equivalent O(3)K2W2 tetrahedra. The corner-sharing octahedral tilt angles range from 19-83°.