Sn(PO3)3 crystallizes in the orthorhombic P2_12_12_1 space group. Sn(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form SnO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-47°. In the second P site, P(2) is bonded to one O(3), one O(5), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-55°. In the third P site, P(3) is bonded to one O(1), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 14-41°. 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 2-coordinate geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sn(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom.
Sn(PO3)3 crystallizes in the orthorhombic P2_12_12_1 space group. Sn(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form SnO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Sn(1)-O(2) bond length is 2.21 Å. The Sn(1)-O(3) bond length is 2.27 Å. The Sn(1)-O(4) bond length is 2.22 Å. The Sn(1)-O(5) bond length is 2.29 Å. The Sn(1)-O(7) bond length is 2.33 Å. The Sn(1)-O(8) bond length is 2.22 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-47°. 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(4) bond length is 1.51 Å. The P(1)-O(6) bond length is 1.62 Å. In the second P site, P(2) is bonded to one O(3), one O(5), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-55°. The P(2)-O(3) bond length is 1.51 Å. The P(2)-O(5) bond length is 1.51 Å. The P(2)-O(6) bond length is 1.61 Å. The P(2)-O(9) bond length is 1.61 Å. In the third P site, P(3) is bonded to one O(1), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 14-41°. The P(3)-O(1) bond length is 1.62 Å. The P(3)-O(7) bond length is 1.49 Å. The P(3)-O(8) bond length is 1.51 Å. The P(3)-O(9) bond length is 1.62 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 2-coordinate geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sn(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom.