Tl2Sn2S5 crystallizes in the monoclinic C2/c space group. Tl(1) is bonded in a 2-coordinate geometry to one S(2) and one S(3) atom. Sn(1) is bonded to one S(1), two equivalent S(2), and two equivalent S(3) atoms to form a mixture of edge and corner-sharing SnS5 trigonal bipyramids. There are three inequivalent S sites. In the first S site, S(1) is bonded in a bent 120 degrees geometry to two equivalent Sn(1) atoms. In the second S site, S(2) is bonded in a 3-coordinate geometry to one Tl(1) and two equivalent Sn(1) atoms. In the third S site, S(3) is bonded in a distorted L-shaped geometry to one Tl(1) and two equivalent Sn(1) atoms.
Tl2Sn2S5 crystallizes in the monoclinic C2/c space group. Tl(1) is bonded in a 2-coordinate geometry to one S(2) and one S(3) atom. The Tl(1)-S(2) bond length is 3.09 Å. The Tl(1)-S(3) bond length is 3.20 Å. Sn(1) is bonded to one S(1), two equivalent S(2), and two equivalent S(3) atoms to form a mixture of edge and corner-sharing SnS5 trigonal bipyramids. The Sn(1)-S(1) bond length is 2.48 Å. There is one shorter (2.46 Å) and one longer (2.57 Å) Sn(1)-S(2) bond length. There is one shorter (2.43 Å) and one longer (2.64 Å) Sn(1)-S(3) bond length. There are three inequivalent S sites. In the first S site, S(1) is bonded in a bent 120 degrees geometry to two equivalent Sn(1) atoms. In the second S site, S(2) is bonded in a 3-coordinate geometry to one Tl(1) and two equivalent Sn(1) atoms. In the third S site, S(3) is bonded in a distorted L-shaped geometry to one Tl(1) and two equivalent Sn(1) atoms.