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K2S is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. K1+ is bonded to four equivalent S2- atoms to form a mixture of edge and corner-sharing KS4 tetrahedra. All K–S bond lengths are 3.23 Å. S2- is bonded in a body-centered cubic geometry to eight equivalent K1+ atoms.
SK1 is alpha boron-derived structured and crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to six S1- atoms. There are two shorter (3.25 Å) and four longer (3.35 Å) K–S bond lengths. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six S1- atoms. There are four shorter (3.17 Å) and two longer (3.25 Å) K–S bond lengths. There are two inequivalent S1- sites. In the first S1- site, S1- is bonded in a 7-coordinate geometry to six K1+ and one S1- atom. The S–S bond length is 2.13 Å. In the second S1- site, S1- is bonded in a 7-coordinate geometry to six K1+ and one S1- atom. The S–S bond length is 2.14 Å.
K2S5 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 7-coordinate geometry to eight S+0.40- atoms. There are a spread of K–S bond distances ranging from 3.32–3.67 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight S+0.40- atoms. There are a spread of K–S bond distances ranging from 3.29–3.62 Å. There are five inequivalent S+0.40- sites. In the first S+0.40- site, S+0.40- is bonded in a 5-coordinate geometry to five K1+ and one S+0.40- atom. The S–S bond length is 2.06 Å. In the second S+0.40- site, S+0.40- is bonded in a 5-coordinate geometry to three K1+ and two S+0.40- atoms. The S–S bond length is 2.08 Å. In the third S+0.40- site, S+0.40- is bonded in a 5-coordinate geometry to four K1+ and one S+0.40- atom. The S–S bond length is 2.06 Å. In the fourth S+0.40- site, S+0.40- is bonded in a 5-coordinate geometry to three K1+ and two S+0.40- atoms. The S–S bond length is 2.09 Å. In the fifth S+0.40- site, S+0.40- is bonded in a 3-coordinate geometry to one K1+ and two S+0.40- atoms.
K2S crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to five equivalent S2- atoms to form distorted KS5 trigonal bipyramids that share corners with twelve equivalent KS6 octahedra, corners with eight equivalent KS5 trigonal bipyramids, edges with six equivalent KS5 trigonal bipyramids, and faces with six equivalent KS6 octahedra. The corner-sharing octahedra tilt angles range from 31–60°. There are a spread of K–S bond distances ranging from 3.06–3.65 Å. In the second K1+ site, K1+ is bonded to six equivalent S2- atoms to form distorted KS6 octahedra that share corners with twelve equivalent KS6 octahedra, corners with twelve equivalent KS5 trigonal bipyramids, edges with six equivalent KS6 octahedra, faces with two equivalent KS6 octahedra, and faces with six equivalent KS5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 51°. There are four shorter (3.56 Å) and two longer (3.58 Å) K–S bond lengths. S2- is bonded in a 3-coordinate geometry to eleven K1+ atoms.
SK1 is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. K1+ is bonded in a body-centered cubic geometry to eight equivalent S1- atoms. All K–S bond lengths are 3.32 Å. S1- is bonded in a body-centered cubic geometry to eight equivalent K1+ atoms.
SK1 is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. K1+ is bonded to six equivalent S1- atoms to form a mixture of corner and edge-sharing KS6 octahedra. The corner-sharing octahedral tilt angles are 0°. All K–S bond lengths are 3.26 Å. S1- is bonded to six equivalent K1+ atoms to form a mixture of corner and edge-sharing SK6 octahedra. The corner-sharing octahedral tilt angles are 0°.
SK1 is Tetraauricupride structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. K1+ is bonded in a distorted body-centered cubic geometry to eight equivalent S1- atoms. All K–S bond lengths are 3.26 Å. S1- is bonded in a distorted body-centered cubic geometry to eight equivalent K1+ atoms.
S2KS crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 9-coordinate geometry to nine S+0.33- atoms. There are a spread of K–S bond distances ranging from 3.22–3.81 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight S+0.33- atoms. There are a spread of K–S bond distances ranging from 3.24–3.80 Å. There are six inequivalent S+0.33- sites. In the first S+0.33- site, S+0.33- is bonded to four K1+ and one S+0.33- atom to form distorted SK4S square pyramids that share corners with two equivalent SK4S square pyramids, corners with four equivalent SK2S2 tetrahedra, corners with two equivalent SK4S trigonal bipyramids, edges with two equivalent SK4S square pyramids, and edges with two equivalent SK4S trigonal bipyramids. The S–S bond length is 2.06 Å. In the second S+0.33- site, S+0.33- is bonded in a 5-coordinate geometry to three K1+ and two S+0.33- atoms. The S–S bond length is 2.05 Å. In the third S+0.33- site, S+0.33- is bonded in a 4-coordinate geometry to two K1+ and two S+0.33- atoms. The S–S bond length is 2.19 Å. In the fourth S+0.33- site, S+0.33- is bonded in a 4-coordinate geometry to two K1+ and two S+0.33- atoms. The S–S bond length is 2.04 Å. In the fifth S+0.33- site, S+0.33- is bonded to two K1+ and two S+0.33- atoms to form distorted corner-sharing SK2S2 tetrahedra. The S–S bond length is 2.06 Å. In the sixth S+0.33- site, S+0.33- is bonded to four K1+ and one S+0.33- atom to form distorted SK4S trigonal bipyramids that share corners with two equivalent SK4S square pyramids, corners with four equivalent SK2S2 tetrahedra, corners with two equivalent SK4S trigonal bipyramids, edges with two equivalent SK4S square pyramids, and edges with two equivalent SK4S trigonal bipyramids.
SK1 crystallizes in the monoclinic C2/m space group. The structure is one-dimensional and consists of two SK1 ribbons oriented in the (0, 0, 1) direction. K1+ is bonded in a linear geometry to two equivalent S1- atoms. Both K–S bond lengths are 3.02 Å. S1- is bonded in a linear geometry to two equivalent K1+ atoms.