TlI3 crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four TlI3 clusters. Tl(1) is bonded in a 5-coordinate geometry to one I(3) atom. There are three inequivalent I sites. In the first I site, I(2) is bonded in a linear geometry to one I(1) and one I(3) atom. In the second I site, I(3) is bonded in a distorted L-shaped geometry to one Tl(1) and one I(2) atom. In the third I site, I(1) is bonded in a 1-coordinate geometry to one I(2) atom.
TlI3 crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four TlI3 clusters. Tl(1) is bonded in a 5-coordinate geometry to one I(3) atom. The Tl(1)-I(3) bond length is 3.59 Å. There are three inequivalent I sites. In the first I site, I(2) is bonded in a linear geometry to one I(1) and one I(3) atom. The I(2)-I(1) bond length is 3.02 Å. The I(2)-I(3) bond length is 2.87 Å. In the second I site, I(3) is bonded in a distorted L-shaped geometry to one Tl(1) and one I(2) atom. In the third I site, I(1) is bonded in a 1-coordinate geometry to one I(2) atom.