K2Mn3S4 crystallizes in the monoclinic P2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to four equivalent S(1) and four equivalent S(2) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to four equivalent S(1) and four equivalent S(2) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form a mixture of distorted corner and edge-sharing MnS4 tetrahedra. In the second Mn site, Mn(2) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form a mixture of corner and edge-sharing MnS4 tetrahedra. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 7-coordinate geometry to two equivalent K(1), two equivalent K(2), one Mn(2), and two equivalent Mn(1) atoms. In the second S site, S(2) is bonded in a 7-coordinate geometry to two equivalent K(1), two equivalent K(2), one Mn(2), and two equivalent Mn(1) atoms.
K2Mn3S4 crystallizes in the monoclinic P2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to four equivalent S(1) and four equivalent S(2) atoms. There are two shorter (3.30 Å) and two longer (3.47 Å) K(1)-S(1) bond lengths. There are two shorter (3.44 Å) and two longer (3.71 Å) K(1)-S(2) bond lengths. In the second K site, K(2) is bonded in a 6-coordinate geometry to four equivalent S(1) and four equivalent S(2) atoms. There are two shorter (3.40 Å) and two longer (3.74 Å) K(2)-S(1) bond lengths. There are two shorter (3.30 Å) and two longer (3.47 Å) K(2)-S(2) bond lengths. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form a mixture of distorted corner and edge-sharing MnS4 tetrahedra. There is one shorter (2.40 Å) and one longer (2.51 Å) Mn(1)-S(1) bond length. There is one shorter (2.40 Å) and one longer (2.51 Å) Mn(1)-S(2) bond length. In the second Mn site, Mn(2) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form a mixture of corner and edge-sharing MnS4 tetrahedra. Both Mn(2)-S(1) bond lengths are 2.44 Å. Both Mn(2)-S(2) bond lengths are 2.43 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 7-coordinate geometry to two equivalent K(1), two equivalent K(2), one Mn(2), and two equivalent Mn(1) atoms. In the second S site, S(2) is bonded in a 7-coordinate geometry to two equivalent K(1), two equivalent K(2), one Mn(2), and two equivalent Mn(1) atoms.