Sn3SO7 crystallizes in the orthorhombic Pca2_1 space group. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the second Sn site, Sn(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form SnO4 tetrahedra that share  a cornercorner with one S(1)O4 tetrahedra. In the third Sn site, Sn(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(6), and one O(7) atom. S(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SO4 tetrahedra that share  a cornercorner with one Sn(2)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Sn(2) and one S(1) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to one Sn(1), one Sn(3), and one S(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Sn(3) and one S(1) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one Sn(1) and one Sn(2) atom. In the fifth O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(2) and one Sn(3) atom. In the sixth O site, O(3) is bonded in a trigonal non-coplanar geometry to one Sn(1), one Sn(2), and one Sn(3) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(1) and one S(1) atom.
Sn3SO7 crystallizes in the orthorhombic Pca2_1 space group. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(6) atom. The Sn(1)-O(1) bond length is 2.06 Å. The Sn(1)-O(3) bond length is 2.24 Å. The Sn(1)-O(4) bond length is 2.41 Å. The Sn(1)-O(6) bond length is 2.69 Å. In the second Sn site, Sn(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form SnO4 tetrahedra that share  a cornercorner with one S(1)O4 tetrahedra. The Sn(2)-O(1) bond length is 1.95 Å. The Sn(2)-O(2) bond length is 1.94 Å. The Sn(2)-O(3) bond length is 1.99 Å. The Sn(2)-O(5) bond length is 2.14 Å. In the third Sn site, Sn(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(6), and one O(7) atom. The Sn(3)-O(2) bond length is 2.06 Å. The Sn(3)-O(3) bond length is 2.24 Å. The Sn(3)-O(6) bond length is 2.54 Å. The Sn(3)-O(7) bond length is 2.51 Å. S(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SO4 tetrahedra that share  a cornercorner with one Sn(2)O4 tetrahedra. The S(1)-O(4) bond length is 1.49 Å. The S(1)-O(5) bond length is 1.53 Å. The S(1)-O(6) bond length is 1.50 Å. The S(1)-O(7) bond length is 1.46 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Sn(2) and one S(1) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to one Sn(1), one Sn(3), and one S(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Sn(3) and one S(1) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one Sn(1) and one Sn(2) atom. In the fifth O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(2) and one Sn(3) atom. In the sixth O site, O(3) is bonded in a trigonal non-coplanar geometry to one Sn(1), one Sn(2), and one Sn(3) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(1) and one S(1) atom.