K2SnS3 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one S(3), two equivalent S(1), and three equivalent S(2) atoms to form distorted KS6 octahedra that share corners with two equivalent K(1)S6 octahedra, corners with five equivalent Sn(1)S4 tetrahedra, edges with three equivalent K(1)S6 octahedra, and  an edgeedge with one Sn(1)S4 tetrahedra. The corner-sharing octahedral tilt angles are 16°. In the second K site, K(2) is bonded in a 6-coordinate geometry to one S(3), two equivalent S(2), and three equivalent S(1) atoms. Sn(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form distorted SnS4 tetrahedra that share corners with five equivalent K(1)S6 octahedra,  an edgeedge with one K(1)S6 octahedra, and  an edgeedge with one Sn(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 11-88°. There are three inequivalent S sites. In the first S site, S(1) is bonded to two equivalent K(1), three equivalent K(2), and one Sn(1) atom to form a mixture of distorted edge and corner-sharing SK5Sn octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the second S site, S(2) is bonded to two equivalent K(2), three equivalent K(1), and one Sn(1) atom to form a mixture of distorted edge and corner-sharing SK5Sn octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the third S site, S(3) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), and two equivalent Sn(1) atoms.
K2SnS3 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one S(3), two equivalent S(1), and three equivalent S(2) atoms to form distorted KS6 octahedra that share corners with two equivalent K(1)S6 octahedra, corners with five equivalent Sn(1)S4 tetrahedra, edges with three equivalent K(1)S6 octahedra, and  an edgeedge with one Sn(1)S4 tetrahedra. The corner-sharing octahedral tilt angles are 16°. The K(1)-S(3) bond length is 3.47 Å. There is one shorter (3.27 Å) and one longer (3.34 Å) K(1)-S(1) bond length. There are a spread of K(1)-S(2) bond distances ranging from 3.34-3.50 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to one S(3), two equivalent S(2), and three equivalent S(1) atoms. The K(2)-S(3) bond length is 3.28 Å. There is one shorter (3.16 Å) and one longer (3.26 Å) K(2)-S(2) bond length. There are a spread of K(2)-S(1) bond distances ranging from 3.29-3.52 Å. Sn(1) is bonded to one S(1), one S(2), and two equivalent S(3) atoms to form distorted SnS4 tetrahedra that share corners with five equivalent K(1)S6 octahedra,  an edgeedge with one K(1)S6 octahedra, and  an edgeedge with one Sn(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 11-88°. The Sn(1)-S(1) bond length is 2.34 Å. The Sn(1)-S(2) bond length is 2.34 Å. There is one shorter (2.46 Å) and one longer (2.49 Å) Sn(1)-S(3) bond length. There are three inequivalent S sites. In the first S site, S(1) is bonded to two equivalent K(1), three equivalent K(2), and one Sn(1) atom to form a mixture of distorted edge and corner-sharing SK5Sn octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the second S site, S(2) is bonded to two equivalent K(2), three equivalent K(1), and one Sn(1) atom to form a mixture of distorted edge and corner-sharing SK5Sn octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the third S site, S(3) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), and two equivalent Sn(1) atoms.