Tl2O3 crystallizes in the trigonal P-3m1 space group. Tl(1) is bonded in a 7-coordinate geometry to three equivalent O(1) and four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to six equivalent Tl(1) atoms to form edge-sharing OTl6 octahedra. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to four equivalent Tl(1) atoms.
Tl2O3 crystallizes in the trigonal P-3m1 space group. Tl(1) is bonded in a 7-coordinate geometry to three equivalent O(1) and four equivalent O(2) atoms. All Tl(1)-O(1) bond lengths are 2.57 Å. There are three shorter (2.20 Å) and one longer (2.74 Å) Tl(1)-O(2) bond length. There are two inequivalent O sites. In the first O site, O(1) is bonded to six equivalent Tl(1) atoms to form edge-sharing OTl6 octahedra. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to four equivalent Tl(1) atoms.