Sn2O3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing SnO6 octahedra. The corner-sharing octahedra are not tilted. In the second Sn site, Sn(2) is bonded in a distorted T-shaped geometry to one O(4) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to four equivalent Sn(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sn(1) and two equivalent Sn(2) atoms. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to three equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Sn(2) atoms.
Sn2O3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing SnO6 octahedra. The corner-sharing octahedra are not tilted. The Sn(1)-O(2) bond length is 1.98 Å. Both Sn(1)-O(1) bond lengths are 2.32 Å. There are two shorter (2.09 Å) and one longer (2.17 Å) Sn(1)-O(3) bond length. In the second Sn site, Sn(2) is bonded in a distorted T-shaped geometry to one O(4) and two equivalent O(2) atoms. The Sn(2)-O(4) bond length is 2.00 Å. Both Sn(2)-O(2) bond lengths are 2.26 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to four equivalent Sn(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sn(1) and two equivalent Sn(2) atoms. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to three equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Sn(2) atoms.