Tl2SnO3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 3-coordinate geometry to one O(2) and two equivalent O(3) atoms. In the second Tl site, Tl(2) is bonded in a 3-coordinate geometry to one O(2) and two equivalent O(3) atoms. Sn(1) is bonded to one O(3), two equivalent O(2), and three equivalent O(1) atoms to form edge-sharing SnO6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Sn(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Tl(1), one Tl(2), and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Tl(1), two equivalent Tl(2), and one Sn(1) atom.
Tl2SnO3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 3-coordinate geometry to one O(2) and two equivalent O(3) atoms. The Tl(1)-O(2) bond length is 2.73 Å. Both Tl(1)-O(3) bond lengths are 2.51 Å. In the second Tl site, Tl(2) is bonded in a 3-coordinate geometry to one O(2) and two equivalent O(3) atoms. The Tl(2)-O(2) bond length is 2.61 Å. Both Tl(2)-O(3) bond lengths are 2.55 Å. Sn(1) is bonded to one O(3), two equivalent O(2), and three equivalent O(1) atoms to form edge-sharing SnO6 octahedra. The Sn(1)-O(3) bond length is 2.03 Å. Both Sn(1)-O(2) bond lengths are 2.09 Å. There is one shorter (2.12 Å) and two longer (2.17 Å) Sn(1)-O(1) bond lengths. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Sn(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Tl(1), one Tl(2), and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Tl(1), two equivalent Tl(2), and one Sn(1) atom.