K2Zn(SO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and two equivalent O(6) atoms. Zn(1) is bonded to one O(1), one O(3), one O(5), one O(7), and one O(8) atom to form ZnO5 trigonal bipyramids that share corners with two equivalent S(1)O4 tetrahedra and corners with three equivalent S(2)O4 tetrahedra. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form SO4 tetrahedra that share corners with two equivalent Zn(1)O5 trigonal bipyramids. In the second S site, S(2) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form SO4 tetrahedra that share corners with three equivalent Zn(1)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one S(1) atom. In the second O site, O(1) is bonded in a 3-coordinate geometry to one K(2), one Zn(1), and one S(2) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one S(2) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one S(1) atom. In the fifth 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 sixth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Zn(1), and one S(2) atom. In the seventh O site, O(6) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one S(1) atom. In the eighth O site, O(7) is bonded in a 2-coordinate geometry to one K(1), one Zn(1), and one S(2) atom.
K2Zn(SO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), and two equivalent O(4) atoms. The K(1)-O(2) bond length is 2.71 Å. The K(1)-O(3) bond length is 2.70 Å. The K(1)-O(5) bond length is 3.20 Å. The K(1)-O(6) bond length is 3.18 Å. The K(1)-O(7) bond length is 2.90 Å. The K(1)-O(8) bond length is 2.72 Å. There is one shorter (2.93 Å) and one longer (2.95 Å) K(1)-O(4) bond length. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and two equivalent O(6) atoms. The K(2)-O(1) bond length is 2.88 Å. The K(2)-O(2) bond length is 2.81 Å. The K(2)-O(4) bond length is 2.82 Å. The K(2)-O(5) bond length is 2.91 Å. There is one shorter (2.79 Å) and one longer (2.86 Å) K(2)-O(6) bond length. Zn(1) is bonded to one O(1), one O(3), one O(5), one O(7), and one O(8) atom to form ZnO5 trigonal bipyramids that share corners with two equivalent S(1)O4 tetrahedra and corners with three equivalent S(2)O4 tetrahedra. The Zn(1)-O(1) bond length is 2.12 Å. The Zn(1)-O(3) bond length is 2.08 Å. The Zn(1)-O(5) bond length is 2.07 Å. The Zn(1)-O(7) bond length is 2.05 Å. The Zn(1)-O(8) bond length is 2.02 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form SO4 tetrahedra that share corners with two equivalent Zn(1)O5 trigonal bipyramids. The S(1)-O(3) bond length is 1.51 Å. The S(1)-O(4) bond length is 1.48 Å. The S(1)-O(6) bond length is 1.48 Å. The S(1)-O(8) bond length is 1.52 Å. In the second S site, S(2) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form SO4 tetrahedra that share corners with three equivalent Zn(1)O5 trigonal bipyramids. The S(2)-O(1) bond length is 1.48 Å. The S(2)-O(2) bond length is 1.47 Å. The S(2)-O(5) bond length is 1.51 Å. The S(2)-O(7) bond length is 1.51 Å. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one S(1) atom. In the second O site, O(1) is bonded in a 3-coordinate geometry to one K(2), one Zn(1), and one S(2) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one S(2) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one S(1) atom. In the fifth 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 sixth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Zn(1), and one S(2) atom. In the seventh O site, O(6) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one S(1) atom. In the eighth O site, O(7) is bonded in a 2-coordinate geometry to one K(1), one Zn(1), and one S(2) atom.