KInP2S7 crystallizes in the monoclinic C2 space group. K(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms. In(1) is bonded to two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms to form InS6 octahedra that share corners with two equivalent P(1)S4 tetrahedra and edges with two equivalent P(1)S4 tetrahedra. P(1) is bonded to one S(1), one S(2), one S(3), and one S(4) atom to form PS4 tetrahedra that share  a cornercorner with one In(1)S6 octahedra,  a cornercorner with one P(1)S4 tetrahedra, and  an edgeedge with one In(1)S6 octahedra. The corner-sharing octahedral tilt angles are 68°. There are four inequivalent S sites. In the first S site, S(1) is bonded to two equivalent K(1) and two equivalent P(1) atoms to form distorted corner-sharing SK2P2 tetrahedra. In the second S site, S(2) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one In(1), and one P(1) atom. In the third S site, S(3) is bonded in a 3-coordinate geometry to one K(1), one In(1), and one P(1) atom. In the fourth S site, S(4) is bonded in a distorted L-shaped geometry to one K(1), one In(1), and one P(1) atom.
KInP2S7 crystallizes in the monoclinic C2 space group. K(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms. Both K(1)-S(1) bond lengths are 3.50 Å. Both K(1)-S(2) bond lengths are 3.43 Å. Both K(1)-S(3) bond lengths are 3.63 Å. Both K(1)-S(4) bond lengths are 3.81 Å. In(1) is bonded to two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms to form InS6 octahedra that share corners with two equivalent P(1)S4 tetrahedra and edges with two equivalent P(1)S4 tetrahedra. Both In(1)-S(2) bond lengths are 2.64 Å. Both In(1)-S(3) bond lengths are 2.65 Å. Both In(1)-S(4) bond lengths are 2.71 Å. P(1) is bonded to one S(1), one S(2), one S(3), and one S(4) atom to form PS4 tetrahedra that share  a cornercorner with one In(1)S6 octahedra,  a cornercorner with one P(1)S4 tetrahedra, and  an edgeedge with one In(1)S6 octahedra. The corner-sharing octahedral tilt angles are 68°. The P(1)-S(1) bond length is 2.16 Å. The P(1)-S(2) bond length is 2.04 Å. The P(1)-S(3) bond length is 2.04 Å. The P(1)-S(4) bond length is 2.02 Å. There are four inequivalent S sites. In the first S site, S(1) is bonded to two equivalent K(1) and two equivalent P(1) atoms to form distorted corner-sharing SK2P2 tetrahedra. In the second S site, S(2) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one In(1), and one P(1) atom. In the third S site, S(3) is bonded in a 3-coordinate geometry to one K(1), one In(1), and one P(1) atom. In the fourth S site, S(4) is bonded in a distorted L-shaped geometry to one K(1), one In(1), and one P(1) atom.