K3AsF12 crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent F(1) and four equivalent F(2) atoms to form a mixture of corner and face-sharing KF8 hexagonal bipyramids. In the second K site, K(2) is bonded to two equivalent F(1) and six equivalent F(2) atoms to form a mixture of distorted corner, edge, and face-sharing KF8 hexagonal bipyramids. As(1) is bonded in a distorted square co-planar geometry to four equivalent F(1) and four equivalent F(3) atoms. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one As(1) atom. In the second F site, F(2) is bonded to one K(1) and three equivalent K(2) atoms to form a mixture of distorted corner, edge, and face-sharing FK4 tetrahedra. In the third F site, F(3) is bonded in a single-bond geometry to one As(1) atom.
K3AsF12 crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent F(1) and four equivalent F(2) atoms to form a mixture of corner and face-sharing KF8 hexagonal bipyramids. All K(1)-F(1) bond lengths are 2.92 Å. All K(1)-F(2) bond lengths are 2.87 Å. In the second K site, K(2) is bonded to two equivalent F(1) and six equivalent F(2) atoms to form a mixture of distorted corner, edge, and face-sharing KF8 hexagonal bipyramids. Both K(2)-F(1) bond lengths are 2.72 Å. There are a spread of K(2)-F(2) bond distances ranging from 2.74-2.92 Å. As(1) is bonded in a distorted square co-planar geometry to four equivalent F(1) and four equivalent F(3) atoms. All As(1)-F(1) bond lengths are 2.27 Å. All As(1)-F(3) bond lengths are 1.75 Å. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one As(1) atom. In the second F site, F(2) is bonded to one K(1) and three equivalent K(2) atoms to form a mixture of distorted corner, edge, and face-sharing FK4 tetrahedra. In the third F site, F(3) is bonded in a single-bond geometry to one As(1) atom.