Sn(HPO4)2 crystallizes in the monoclinic C2/c space group. Sn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form distorted SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra and edges with two equivalent Sn(1)O6 octahedra. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-57°. H(1) is bonded in a linear geometry to one O(1) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Sn(1) and one P(1) atom.
Sn(HPO4)2 crystallizes in the monoclinic C2/c space group. Sn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form distorted SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra and edges with two equivalent Sn(1)O6 octahedra. Both Sn(1)-O(2) bond lengths are 2.01 Å. There are two shorter (2.11 Å) and two longer (2.24 Å) Sn(1)-O(3) bond lengths. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-57°. The P(1)-O(1) bond length is 1.49 Å. The P(1)-O(2) bond length is 1.57 Å. The P(1)-O(3) bond length is 1.65 Å. The P(1)-O(4) bond length is 1.54 Å. H(1) is bonded in a linear geometry to one O(1) and one O(4) atom. The H(1)-O(1) bond length is 1.48 Å. The H(1)-O(4) bond length is 1.05 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Sn(1) and one P(1) atom.