Sn(PO3)3 crystallizes in the triclinic P-1 space group. Sn(1) is bonded to one O(2), one O(3), one O(4), one O(7), one O(8), and two equivalent O(6) atoms to form distorted SnO7 pentagonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(3)O4 tetrahedra, and  an edgeedge with one Sn(1)O7 pentagonal bipyramid. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O7 pentagonal bipyramids,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. In the second P site, P(2) is bonded to one O(3), one O(5), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O7 pentagonal bipyramids,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. In the third P site, P(3) is bonded to one O(1), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Sn(1)O7 pentagonal bipyramids,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sn(1) and one P(3) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sn(1) and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom.
Sn(PO3)3 crystallizes in the triclinic P-1 space group. Sn(1) is bonded to one O(2), one O(3), one O(4), one O(7), one O(8), and two equivalent O(6) atoms to form distorted SnO7 pentagonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(3)O4 tetrahedra, and  an edgeedge with one Sn(1)O7 pentagonal bipyramid. The Sn(1)-O(2) bond length is 2.30 Å. The Sn(1)-O(3) bond length is 2.30 Å. The Sn(1)-O(4) bond length is 2.32 Å. The Sn(1)-O(7) bond length is 2.31 Å. The Sn(1)-O(8) bond length is 2.24 Å. There is one shorter (2.41 Å) and one longer (2.60 Å) Sn(1)-O(6) bond length. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O7 pentagonal bipyramids,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The P(1)-O(1) bond length is 1.60 Å. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(7) bond length is 1.50 Å. The P(1)-O(9) bond length is 1.63 Å. In the second P site, P(2) is bonded to one O(3), one O(5), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O7 pentagonal bipyramids,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The P(2)-O(3) bond length is 1.51 Å. The P(2)-O(5) bond length is 1.62 Å. The P(2)-O(8) bond length is 1.51 Å. The P(2)-O(9) bond length is 1.60 Å. In the third P site, P(3) is bonded to one O(1), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Sn(1)O7 pentagonal bipyramids,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The P(3)-O(1) bond length is 1.57 Å. The P(3)-O(4) bond length is 1.49 Å. The P(3)-O(5) bond length is 1.61 Å. The P(3)-O(6) bond length is 1.54 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sn(1) and one P(3) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sn(1) and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom.