K3TaO2F7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to four equivalent F(5) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one F(1), one F(2), one F(4), two equivalent F(3), and two equivalent F(5) atoms. Ta(1) is bonded in a distorted pentagonal bipyramidal geometry to two equivalent O(1), one F(1), one F(2), one F(4), and two equivalent F(3) atoms. O(1) is bonded in a 3-coordinate geometry to one K(2), one Ta(1), and one O(1) atom. There are five inequivalent F sites. In the first F site, F(3) is bonded in a single-bond geometry to two equivalent K(2) and one Ta(1) atom. In the second F site, F(4) is bonded in a distorted single-bond geometry to two equivalent K(2) and one Ta(1) atom. In the third F site, F(5) is bonded to two equivalent K(1) and two equivalent K(2) atoms to form a mixture of distorted corner and edge-sharing FK4 trigonal pyramids. In the fourth F site, F(1) is bonded in a distorted trigonal planar geometry to two equivalent K(2) and one Ta(1) atom. In the fifth F site, F(2) is bonded in a distorted single-bond geometry to two equivalent K(2) and one Ta(1) atom.
K3TaO2F7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to four equivalent F(5) atoms. There are two shorter (2.63 Å) and two longer (2.71 Å) K(1)-F(5) bond lengths. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one F(1), one F(2), one F(4), two equivalent F(3), and two equivalent F(5) atoms. The K(2)-O(1) bond length is 3.00 Å. The K(2)-F(1) bond length is 2.72 Å. The K(2)-F(2) bond length is 3.03 Å. The K(2)-F(4) bond length is 2.88 Å. There is one shorter (3.04 Å) and one longer (3.19 Å) K(2)-F(3) bond length. Both K(2)-F(5) bond lengths are 2.51 Å. Ta(1) is bonded in a distorted pentagonal bipyramidal geometry to two equivalent O(1), one F(1), one F(2), one F(4), and two equivalent F(3) atoms. Both Ta(1)-O(1) bond lengths are 2.12 Å. The Ta(1)-F(1) bond length is 1.94 Å. The Ta(1)-F(2) bond length is 1.92 Å. The Ta(1)-F(4) bond length is 1.94 Å. Both Ta(1)-F(3) bond lengths are 1.95 Å. O(1) is bonded in a 3-coordinate geometry to one K(2), one Ta(1), and one O(1) atom. The O(1)-O(1) bond length is 1.35 Å. There are five inequivalent F sites. In the first F site, F(3) is bonded in a single-bond geometry to two equivalent K(2) and one Ta(1) atom. In the second F site, F(4) is bonded in a distorted single-bond geometry to two equivalent K(2) and one Ta(1) atom. In the third F site, F(5) is bonded to two equivalent K(1) and two equivalent K(2) atoms to form a mixture of distorted corner and edge-sharing FK4 trigonal pyramids. In the fourth F site, F(1) is bonded in a distorted trigonal planar geometry to two equivalent K(2) and one Ta(1) atom. In the fifth F site, F(2) is bonded in a distorted single-bond geometry to two equivalent K(2) and one Ta(1) atom.