K2B2S7 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 9-coordinate geometry to one S(1), two equivalent S(4), three equivalent S(2), and three equivalent S(3) atoms. B(1) is bonded to one S(1), one S(2), one S(3), and one S(4) atom to form corner-sharing BS4 tetrahedra. There are four inequivalent S sites. In the first S site, S(1) is bonded in a distorted water-like geometry to two equivalent K(1) and two equivalent B(1) atoms. In the second S site, S(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one B(1) atom. In the third S site, S(3) is bonded in a distorted single-bond geometry to three equivalent K(1), one B(1), and one S(4) atom. In the fourth S site, S(4) is bonded in a distorted single-bond geometry to two equivalent K(1), one B(1), and one S(3) atom.
K2B2S7 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 9-coordinate geometry to one S(1), two equivalent S(4), three equivalent S(2), and three equivalent S(3) atoms. The K(1)-S(1) bond length is 3.47 Å. There is one shorter (3.21 Å) and one longer (3.31 Å) K(1)-S(4) bond length. There are a spread of K(1)-S(2) bond distances ranging from 3.29-3.46 Å. There are a spread of K(1)-S(3) bond distances ranging from 3.29-3.63 Å. B(1) is bonded to one S(1), one S(2), one S(3), and one S(4) atom to form corner-sharing BS4 tetrahedra. The B(1)-S(1) bond length is 1.92 Å. The B(1)-S(2) bond length is 1.92 Å. The B(1)-S(3) bond length is 1.91 Å. The B(1)-S(4) bond length is 1.90 Å. There are four inequivalent S sites. In the first S site, S(1) is bonded in a distorted water-like geometry to two equivalent K(1) and two equivalent B(1) atoms. In the second S site, S(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one B(1) atom. In the third S site, S(3) is bonded in a distorted single-bond geometry to three equivalent K(1), one B(1), and one S(4) atom. The S(3)-S(4) bond length is 2.09 Å. In the fourth S site, S(4) is bonded in a distorted single-bond geometry to two equivalent K(1), one B(1), and one S(3) atom.