K2SnF6H2O crystallizes in the orthorhombic Fddd space group. The structure consists of sixteen water molecules inside a K2SnF6 framework. In the K2SnF6 framework, there are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to two equivalent F(2), four equivalent F(1), and four equivalent F(3) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent F(1), two equivalent F(2), and two equivalent F(3) atoms. Sn(1) is bonded in an octahedral geometry to two equivalent F(1), two equivalent F(2), and two equivalent F(3) atoms. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Sn(1) atom. In the second F site, F(2) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one Sn(1) atom. In the third F site, F(3) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Sn(1) atom.
K2SnF6H2O crystallizes in the orthorhombic Fddd space group. The structure consists of sixteen water molecules inside a K2SnF6 framework. In the K2SnF6 framework, there are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to two equivalent F(2), four equivalent F(1), and four equivalent F(3) atoms. Both K(1)-F(2) bond lengths are 3.03 Å. There are two shorter (2.86 Å) and two longer (2.92 Å) K(1)-F(1) bond lengths. There are two shorter (2.90 Å) and two longer (3.13 Å) K(1)-F(3) bond lengths. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent F(1), two equivalent F(2), and two equivalent F(3) atoms. Both K(2)-F(1) bond lengths are 2.67 Å. Both K(2)-F(2) bond lengths are 2.69 Å. Both K(2)-F(3) bond lengths are 2.67 Å. Sn(1) is bonded in an octahedral geometry to two equivalent F(1), two equivalent F(2), and two equivalent F(3) atoms. Both Sn(1)-F(1) bond lengths are 2.01 Å. Both Sn(1)-F(2) bond lengths are 2.00 Å. Both Sn(1)-F(3) bond lengths are 2.00 Å. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Sn(1) atom. In the second F site, F(2) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one Sn(1) atom. In the third F site, F(3) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Sn(1) atom.