ZnH2(SO4)2 crystallizes in the monoclinic P2_1/c space group. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form ZnO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra. H(1) is bonded in a distorted single-bond geometry to one O(2) and one O(4) atom. S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share corners with three equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-44°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Zn(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one H(1), and one S(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one S(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one H(1) and one S(1) atom.
ZnH2(SO4)2 crystallizes in the monoclinic P2_1/c space group. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form ZnO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra. Both Zn(1)-O(1) bond lengths are 2.09 Å. Both Zn(1)-O(2) bond lengths are 2.19 Å. Both Zn(1)-O(3) bond lengths are 2.08 Å. H(1) is bonded in a distorted single-bond geometry to one O(2) and one O(4) atom. The H(1)-O(2) bond length is 1.65 Å. The H(1)-O(4) bond length is 1.01 Å. S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share corners with three equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-44°. The S(1)-O(1) bond length is 1.46 Å. The S(1)-O(2) bond length is 1.48 Å. The S(1)-O(3) bond length is 1.47 Å. The S(1)-O(4) bond length is 1.57 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Zn(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one H(1), and one S(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one S(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one H(1) and one S(1) atom.