K2W2O7 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. W(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and one W(1) atom. In the second O site, O(2) is bonded to two equivalent K(1) and two equivalent W(1) atoms to form a mixture of distorted corner and edge-sharing OK2W2 tetrahedra. In the third O site, O(3) is bonded in a linear geometry to four equivalent K(1) and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent K(1) and two equivalent W(1) atoms.
K2W2O7 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. There is one shorter (2.69 Å) and one longer (2.71 Å) K(1)-O(2) bond length. There is one shorter (3.15 Å) and one longer (3.20 Å) K(1)-O(3) bond length. There is one shorter (3.09 Å) and one longer (3.12 Å) K(1)-O(4) bond length. There are a spread of K(1)-O(1) bond distances ranging from 2.88-2.94 Å. W(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. The W(1)-O(1) bond length is 1.77 Å. The W(1)-O(3) bond length is 1.95 Å. There is one shorter (1.86 Å) and one longer (2.19 Å) W(1)-O(2) bond length. There is one shorter (1.83 Å) and one longer (2.07 Å) W(1)-O(4) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and one W(1) atom. In the second O site, O(2) is bonded to two equivalent K(1) and two equivalent W(1) atoms to form a mixture of distorted corner and edge-sharing OK2W2 tetrahedra. In the third O site, O(3) is bonded in a linear geometry to four equivalent K(1) and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent K(1) and two equivalent W(1) atoms.