(KTaWO6)2O2 crystallizes in the orthorhombic Imma space group. The structure consists of four water atoms inside a KTaWO6 framework. In the KTaWO6 framework, K(1) is bonded in a hexagonal planar geometry to two equivalent O(1) and four equivalent O(3) atoms. Ta(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with four equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-38°. W(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra and corners with four equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-37°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Ta(1), and one W(1) atom.
(KTaWO6)2O2 crystallizes in the orthorhombic Imma space group. The structure consists of four water atoms inside a KTaWO6 framework. In the KTaWO6 framework, K(1) is bonded in a hexagonal planar geometry to two equivalent O(1) and four equivalent O(3) atoms. Both K(1)-O(1) bond lengths are 2.72 Å. All K(1)-O(3) bond lengths are 2.76 Å. Ta(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with four equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-38°. Both Ta(1)-O(1) bond lengths are 1.99 Å. All Ta(1)-O(3) bond lengths are 2.00 Å. W(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra and corners with four equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-37°. Both W(1)-O(2) bond lengths are 1.96 Å. All W(1)-O(3) bond lengths are 1.94 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Ta(1), and one W(1) atom.