CsH(ZnPO4)2 crystallizes in the orthorhombic Cmce space group. Cs(1) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. Zn(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra and corners with four equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with four equivalent Zn(1)O4 tetrahedra. H(1) is bonded in a linear geometry to two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one P(1), and one H(1) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one P(1) atom. In the third O site, O(2) is bonded in a 2-coordinate geometry to one Cs(1), one Zn(1), and one P(1) atom.
CsH(ZnPO4)2 crystallizes in the orthorhombic Cmce space group. Cs(1) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. Both Cs(1)-O(3) bond lengths are 3.14 Å. All Cs(1)-O(2) bond lengths are 3.25 Å. Zn(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra and corners with four equivalent P(1)O4 tetrahedra. Both Zn(1)-O(1) bond lengths are 1.98 Å. Both Zn(1)-O(2) bond lengths are 1.93 Å. P(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with four equivalent Zn(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.57 Å. The P(1)-O(3) bond length is 1.54 Å. Both P(1)-O(2) bond lengths are 1.52 Å. H(1) is bonded in a linear geometry to two equivalent O(3) atoms. Both H(1)-O(3) bond lengths are 1.20 Å. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one P(1), and one H(1) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one P(1) atom. In the third O site, O(2) is bonded in a 2-coordinate geometry to one Cs(1), one Zn(1), and one P(1) atom.