KSnF3 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one F(1), one F(10), one F(2), one F(3), one F(5), one F(7), one F(8), and two equivalent F(11) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one F(1), one F(3), one F(4), one F(7), one F(8), one F(9), and two equivalent F(11) atoms. In the third K site, K(3) is bonded in a 8-coordinate geometry to one F(1), one F(5), one F(8), one F(9), two equivalent F(12), and two equivalent F(4) atoms. In the fourth K site, K(4) is bonded in a 7-coordinate geometry to one F(10), one F(6), one F(7), two equivalent F(2), and two equivalent F(3) atoms. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted rectangular see-saw-like geometry to one F(1), one F(2), one F(5), and one F(6) atom. In the second Sn site, Sn(2) is bonded in a distorted rectangular see-saw-like geometry to one F(3), one F(4), one F(5), and one F(6) atom. In the third Sn site, Sn(3) is bonded in a distorted rectangular see-saw-like geometry to one F(10), one F(7), one F(8), and one F(9) atom. In the fourth Sn site, Sn(4) is bonded in a distorted rectangular see-saw-like geometry to one F(10), one F(11), one F(12), and one F(9) atom. There are twelve inequivalent F sites. In the first F site, F(1) is bonded to one K(1), one K(2), one K(3), and one Sn(1) atom to form distorted FK3Sn trigonal pyramids that share  a cornercorner with one F(5)K2Sn2 tetrahedra,  a cornercorner with one F(4)K3Sn tetrahedra, corners with three equivalent F(8)K3Sn tetrahedra,  a cornercorner with one F(10)K2Sn2 trigonal pyramid,  an edgeedge with one F(5)K2Sn2 tetrahedra,  an edgeedge with one F(9)K2Sn2 tetrahedra, and  an edgeedge with one F(4)K3Sn tetrahedra. In the second F site, F(2) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(4), and one Sn(1) atom. In the third F site, F(3) is bonded in a 5-coordinate geometry to one K(1), one K(2), two equivalent K(4), and one Sn(2) atom. In the fourth F site, F(4) is bonded to one K(2), two equivalent K(3), and one Sn(2) atom to form distorted FK3Sn tetrahedra that share  a cornercorner with one F(5)K2Sn2 tetrahedra,  a cornercorner with one F(9)K2Sn2 tetrahedra,  a cornercorner with one F(8)K3Sn tetrahedra,  a cornercorner with one F(1)K3Sn trigonal pyramid,  an edgeedge with one F(5)K2Sn2 tetrahedra,  an edgeedge with one F(9)K2Sn2 tetrahedra,  an edgeedge with one F(4)K3Sn tetrahedra,  an edgeedge with one F(8)K3Sn tetrahedra, and  an edgeedge with one F(1)K3Sn trigonal pyramid. In the fifth F site, F(5) is bonded to one K(1), one K(3), one Sn(1), and one Sn(2) atom to form FK2Sn2 tetrahedra that share  a cornercorner with one F(9)K2Sn2 tetrahedra,  a cornercorner with one F(4)K3Sn tetrahedra,  a cornercorner with one F(10)K2Sn2 trigonal pyramid,  a cornercorner with one F(1)K3Sn trigonal pyramid,  an edgeedge with one F(4)K3Sn tetrahedra,  an edgeedge with one F(8)K3Sn tetrahedra, and  an edgeedge with one F(1)K3Sn trigonal pyramid. In the sixth F site, F(6) is bonded in a trigonal planar geometry to one K(4), one Sn(1), and one Sn(2) atom. In the seventh F site, F(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(4), and one Sn(3) atom. In the eighth F site, F(8) is bonded to one K(1), one K(2), one K(3), and one Sn(3) atom to form distorted FK3Sn tetrahedra that share  a cornercorner with one F(9)K2Sn2 tetrahedra,  a cornercorner with one F(4)K3Sn tetrahedra, corners with two equivalent F(10)K2Sn2 trigonal pyramids, corners with three equivalent F(1)K3Sn trigonal pyramids,  an edgeedge with one F(5)K2Sn2 tetrahedra,  an edgeedge with one F(9)K2Sn2 tetrahedra, and  an edgeedge with one F(4)K3Sn tetrahedra. In the ninth F site, F(9) is bonded to one K(2), one K(3), one Sn(3), and one Sn(4) atom to form FK2Sn2 tetrahedra that share  a cornercorner with one F(5)K2Sn2 tetrahedra,  a cornercorner with one F(4)K3Sn tetrahedra,  a cornercorner with one F(8)K3Sn tetrahedra, corners with two equivalent F(10)K2Sn2 trigonal pyramids,  an edgeedge with one F(4)K3Sn tetrahedra,  an edgeedge with one F(8)K3Sn tetrahedra, and  an edgeedge with one F(1)K3Sn trigonal pyramid. In the tenth F site, F(10) is bonded to one K(1), one K(4), one Sn(3), and one Sn(4) atom to form distorted FK2Sn2 trigonal pyramids that share  a cornercorner with one F(5)K2Sn2 tetrahedra, corners with two equivalent F(9)K2Sn2 tetrahedra, corners with two equivalent F(8)K3Sn tetrahedra, and  a cornercorner with one F(1)K3Sn trigonal pyramid. In the eleventh F site, F(11) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent K(2), and one Sn(4) atom. In the twelfth F site, F(12) is bonded in a distorted T-shaped geometry to two equivalent K(3) and one Sn(4) atom.
KSnF3 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one F(1), one F(10), one F(2), one F(3), one F(5), one F(7), one F(8), and two equivalent F(11) atoms. The K(1)-F(1) bond length is 2.66 Å. The K(1)-F(10) bond length is 2.64 Å. The K(1)-F(2) bond length is 3.06 Å. The K(1)-F(3) bond length is 3.22 Å. The K(1)-F(5) bond length is 2.67 Å. The K(1)-F(7) bond length is 2.96 Å. The K(1)-F(8) bond length is 2.69 Å. There is one shorter (2.70 Å) and one longer (3.24 Å) K(1)-F(11) bond length. In the second K site, K(2) is bonded in a 8-coordinate geometry to one F(1), one F(3), one F(4), one F(7), one F(8), one F(9), and two equivalent F(11) atoms. The K(2)-F(1) bond length is 2.65 Å. The K(2)-F(3) bond length is 2.80 Å. The K(2)-F(4) bond length is 2.72 Å. The K(2)-F(7) bond length is 2.76 Å. The K(2)-F(8) bond length is 2.72 Å. The K(2)-F(9) bond length is 2.69 Å. There is one shorter (2.70 Å) and one longer (2.94 Å) K(2)-F(11) bond length. In the third K site, K(3) is bonded in a 8-coordinate geometry to one F(1), one F(5), one F(8), one F(9), two equivalent F(12), and two equivalent F(4) atoms. The K(3)-F(1) bond length is 2.67 Å. The K(3)-F(5) bond length is 2.61 Å. The K(3)-F(8) bond length is 2.74 Å. The K(3)-F(9) bond length is 2.67 Å. There is one shorter (2.71 Å) and one longer (2.82 Å) K(3)-F(12) bond length. There is one shorter (2.72 Å) and one longer (2.81 Å) K(3)-F(4) bond length. In the fourth K site, K(4) is bonded in a 7-coordinate geometry to one F(10), one F(6), one F(7), two equivalent F(2), and two equivalent F(3) atoms. The K(4)-F(10) bond length is 2.76 Å. The K(4)-F(6) bond length is 2.60 Å. The K(4)-F(7) bond length is 2.69 Å. There is one shorter (2.60 Å) and one longer (2.70 Å) K(4)-F(2) bond length. There is one shorter (2.74 Å) and one longer (2.98 Å) K(4)-F(3) bond length. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted rectangular see-saw-like geometry to one F(1), one F(2), one F(5), and one F(6) atom. The Sn(1)-F(1) bond length is 2.05 Å. The Sn(1)-F(2) bond length is 2.08 Å. The Sn(1)-F(5) bond length is 2.26 Å. The Sn(1)-F(6) bond length is 2.22 Å. In the second Sn site, Sn(2) is bonded in a distorted rectangular see-saw-like geometry to one F(3), one F(4), one F(5), and one F(6) atom. The Sn(2)-F(3) bond length is 2.09 Å. The Sn(2)-F(4) bond length is 2.06 Å. The Sn(2)-F(5) bond length is 2.24 Å. The Sn(2)-F(6) bond length is 2.22 Å. In the third Sn site, Sn(3) is bonded in a distorted rectangular see-saw-like geometry to one F(10), one F(7), one F(8), and one F(9) atom. The Sn(3)-F(10) bond length is 2.22 Å. The Sn(3)-F(7) bond length is 2.06 Å. The Sn(3)-F(8) bond length is 2.04 Å. The Sn(3)-F(9) bond length is 2.34 Å. In the fourth Sn site, Sn(4) is bonded in a distorted rectangular see-saw-like geometry to one F(10), one F(11), one F(12), and one F(9) atom. The Sn(4)-F(10) bond length is 2.34 Å. The Sn(4)-F(11) bond length is 2.05 Å. The Sn(4)-F(12) bond length is 2.04 Å. The Sn(4)-F(9) bond length is 2.22 Å. There are twelve inequivalent F sites. In the first F site, F(1) is bonded to one K(1), one K(2), one K(3), and one Sn(1) atom to form distorted FK3Sn trigonal pyramids that share  a cornercorner with one F(5)K2Sn2 tetrahedra,  a cornercorner with one F(4)K3Sn tetrahedra, corners with three equivalent F(8)K3Sn tetrahedra,  a cornercorner with one F(10)K2Sn2 trigonal pyramid,  an edgeedge with one F(5)K2Sn2 tetrahedra,  an edgeedge with one F(9)K2Sn2 tetrahedra, and  an edgeedge with one F(4)K3Sn tetrahedra. In the second F site, F(2) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(4), and one Sn(1) atom. In the third F site, F(3) is bonded in a 5-coordinate geometry to one K(1), one K(2), two equivalent K(4), and one Sn(2) atom. In the fourth F site, F(4) is bonded to one K(2), two equivalent K(3), and one Sn(2) atom to form distorted FK3Sn tetrahedra that share  a cornercorner with one F(5)K2Sn2 tetrahedra,  a cornercorner with one F(9)K2Sn2 tetrahedra,  a cornercorner with one F(8)K3Sn tetrahedra,  a cornercorner with one F(1)K3Sn trigonal pyramid,  an edgeedge with one F(5)K2Sn2 tetrahedra,  an edgeedge with one F(9)K2Sn2 tetrahedra,  an edgeedge with one F(4)K3Sn tetrahedra,  an edgeedge with one F(8)K3Sn tetrahedra, and  an edgeedge with one F(1)K3Sn trigonal pyramid. In the fifth F site, F(5) is bonded to one K(1), one K(3), one Sn(1), and one Sn(2) atom to form FK2Sn2 tetrahedra that share  a cornercorner with one F(9)K2Sn2 tetrahedra,  a cornercorner with one F(4)K3Sn tetrahedra,  a cornercorner with one F(10)K2Sn2 trigonal pyramid,  a cornercorner with one F(1)K3Sn trigonal pyramid,  an edgeedge with one F(4)K3Sn tetrahedra,  an edgeedge with one F(8)K3Sn tetrahedra, and  an edgeedge with one F(1)K3Sn trigonal pyramid. In the sixth F site, F(6) is bonded in a trigonal planar geometry to one K(4), one Sn(1), and one Sn(2) atom. In the seventh F site, F(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(4), and one Sn(3) atom. In the eighth F site, F(8) is bonded to one K(1), one K(2), one K(3), and one Sn(3) atom to form distorted FK3Sn tetrahedra that share  a cornercorner with one F(9)K2Sn2 tetrahedra,  a cornercorner with one F(4)K3Sn tetrahedra, corners with two equivalent F(10)K2Sn2 trigonal pyramids, corners with three equivalent F(1)K3Sn trigonal pyramids,  an edgeedge with one F(5)K2Sn2 tetrahedra,  an edgeedge with one F(9)K2Sn2 tetrahedra, and  an edgeedge with one F(4)K3Sn tetrahedra. In the ninth F site, F(9) is bonded to one K(2), one K(3), one Sn(3), and one Sn(4) atom to form FK2Sn2 tetrahedra that share  a cornercorner with one F(5)K2Sn2 tetrahedra,  a cornercorner with one F(4)K3Sn tetrahedra,  a cornercorner with one F(8)K3Sn tetrahedra, corners with two equivalent F(10)K2Sn2 trigonal pyramids,  an edgeedge with one F(4)K3Sn tetrahedra,  an edgeedge with one F(8)K3Sn tetrahedra, and  an edgeedge with one F(1)K3Sn trigonal pyramid. In the tenth F site, F(10) is bonded to one K(1), one K(4), one Sn(3), and one Sn(4) atom to form distorted FK2Sn2 trigonal pyramids that share  a cornercorner with one F(5)K2Sn2 tetrahedra, corners with two equivalent F(9)K2Sn2 tetrahedra, corners with two equivalent F(8)K3Sn tetrahedra, and  a cornercorner with one F(1)K3Sn trigonal pyramid. In the eleventh F site, F(11) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent K(2), and one Sn(4) atom. In the twelfth F site, F(12) is bonded in a distorted T-shaped geometry to two equivalent K(3) and one Sn(4) atom.