K3(SO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(4), three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. S(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one S(1) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(1) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(1) atom.
K3(SO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. Both K(1)-O(1) bond lengths are 2.77 Å. Both K(1)-O(2) bond lengths are 2.77 Å. Both K(1)-O(3) bond lengths are 2.75 Å. There are two shorter (2.98 Å) and two longer (3.06 Å) K(1)-O(4) bond lengths. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(4), three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. The K(2)-O(4) bond length is 2.80 Å. There are a spread of K(2)-O(1) bond distances ranging from 2.78-2.94 Å. There are a spread of K(2)-O(2) bond distances ranging from 2.80-2.98 Å. There are a spread of K(2)-O(3) bond distances ranging from 2.86-3.33 Å. S(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The S(1)-O(1) bond length is 1.46 Å. The S(1)-O(2) bond length is 1.46 Å. The S(1)-O(3) bond length is 1.47 Å. The S(1)-O(4) bond length is 1.51 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one S(1) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(1) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one S(1) atom.