K2TaF7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a distorted q6 geometry to two equivalent F(1), two equivalent F(3), three equivalent F(4), and four equivalent F(2) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to two equivalent F(2), four equivalent F(1), and four equivalent F(3) atoms. Ta(1) is bonded in a distorted pentagonal bipyramidal geometry to one F(4), two equivalent F(1), two equivalent F(2), and two equivalent F(3) atoms. There are four inequivalent F sites. In the first F site, F(4) is bonded in a distorted single-bond geometry to three equivalent K(1) and one Ta(1) atom. In the second F site, F(1) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one Ta(1) atom. In the third F site, F(2) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Ta(1) atom. In the fourth F site, F(3) is bonded in a 1-coordinate geometry to one K(1), two equivalent K(2), and one Ta(1) atom.
K2TaF7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a distorted q6 geometry to two equivalent F(1), two equivalent F(3), three equivalent F(4), and four equivalent F(2) atoms. Both K(1)-F(1) bond lengths are 2.91 Å. Both K(1)-F(3) bond lengths are 2.67 Å. There is one shorter (2.86 Å) and two longer (2.88 Å) K(1)-F(4) bond lengths. There are two shorter (2.72 Å) and two longer (2.78 Å) K(1)-F(2) bond lengths. In the second K site, K(2) is bonded in a 10-coordinate geometry to two equivalent F(2), four equivalent F(1), and four equivalent F(3) atoms. Both K(2)-F(2) bond lengths are 2.70 Å. There are two shorter (2.78 Å) and two longer (2.87 Å) K(2)-F(1) bond lengths. There are two shorter (3.04 Å) and two longer (3.13 Å) K(2)-F(3) bond lengths. Ta(1) is bonded in a distorted pentagonal bipyramidal geometry to one F(4), two equivalent F(1), two equivalent F(2), and two equivalent F(3) atoms. The Ta(1)-F(4) bond length is 1.99 Å. Both Ta(1)-F(1) bond lengths are 1.96 Å. Both Ta(1)-F(2) bond lengths are 1.97 Å. Both Ta(1)-F(3) bond lengths are 1.96 Å. There are four inequivalent F sites. In the first F site, F(4) is bonded in a distorted single-bond geometry to three equivalent K(1) and one Ta(1) atom. In the second F site, F(1) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one Ta(1) atom. In the third F site, F(2) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Ta(1) atom. In the fourth F site, F(3) is bonded in a 1-coordinate geometry to one K(1), two equivalent K(2), and one Ta(1) atom.