(NH4)2KWO3F3 crystallizes in the orthorhombic Fmm2 space group. The structure consists of eight ammonium molecules inside a KW(OF)3 framework. In the KW(OF)3 framework, K(1) is bonded to one O(2), two equivalent O(1), one F(2), and two equivalent F(1) atoms to form KO3F3 octahedra that share corners with six equivalent W(1)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. W(1) is bonded to one O(2), two equivalent O(1), one F(2), and two equivalent F(1) atoms to form WO3F3 octahedra that share corners with six equivalent K(1)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one K(1) and one W(1) atom. In the second O site, O(2) is bonded in a linear geometry to one K(1) and one W(1) atom. There are two inequivalent F sites. In the first F site, F(1) is bonded in a linear geometry to one K(1) and one W(1) atom. In the second F site, F(2) is bonded in a linear geometry to one K(1) and one W(1) atom.
(NH4)2KWO3F3 crystallizes in the orthorhombic Fmm2 space group. The structure consists of eight ammonium molecules inside a KW(OF)3 framework. In the KW(OF)3 framework, K(1) is bonded to one O(2), two equivalent O(1), one F(2), and two equivalent F(1) atoms to form KO3F3 octahedra that share corners with six equivalent W(1)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. The K(1)-O(2) bond length is 2.69 Å. Both K(1)-O(1) bond lengths are 2.79 Å. The K(1)-F(2) bond length is 2.59 Å. Both K(1)-F(1) bond lengths are 2.49 Å. W(1) is bonded to one O(2), two equivalent O(1), one F(2), and two equivalent F(1) atoms to form WO3F3 octahedra that share corners with six equivalent K(1)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. The W(1)-O(2) bond length is 1.82 Å. Both W(1)-O(1) bond lengths are 1.87 Å. The W(1)-F(2) bond length is 2.15 Å. Both W(1)-F(1) bond lengths are 2.00 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one K(1) and one W(1) atom. In the second O site, O(2) is bonded in a linear geometry to one K(1) and one W(1) atom. There are two inequivalent F sites. In the first F site, F(1) is bonded in a linear geometry to one K(1) and one W(1) atom. In the second F site, F(2) is bonded in a linear geometry to one K(1) and one W(1) atom.