Tl2Te3O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 4-coordinate geometry to one O(3), one O(6), and two equivalent O(7) atoms. In the second Tl site, Tl(2) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(6) atoms. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded in a distorted see-saw-like geometry to one O(5), one O(7), and two equivalent O(4) atoms. In the second Te site, Te(2) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. In the third Te site, Te(3) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Te(2) and one Te(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Te(2) and one Te(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Tl(1), one Tl(2), and one Te(2) atom. In the fourth O site, O(4) is bonded in a water-like geometry to two equivalent Te(1) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Te(1) and one Te(3) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Tl(1), two equivalent Tl(2), and one Te(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to two equivalent Tl(1) and one Te(1) atom.
Tl2Te3O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 4-coordinate geometry to one O(3), one O(6), and two equivalent O(7) atoms. The Tl(1)-O(3) bond length is 2.48 Å. The Tl(1)-O(6) bond length is 2.82 Å. There is one shorter (2.59 Å) and one longer (2.71 Å) Tl(1)-O(7) bond length. In the second Tl site, Tl(2) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(6) atoms. The Tl(2)-O(3) bond length is 2.62 Å. There is one shorter (2.51 Å) and one longer (2.75 Å) Tl(2)-O(6) bond length. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded in a distorted see-saw-like geometry to one O(5), one O(7), and two equivalent O(4) atoms. The Te(1)-O(5) bond length is 2.04 Å. The Te(1)-O(7) bond length is 1.85 Å. There is one shorter (1.92 Å) and one longer (2.20 Å) Te(1)-O(4) bond length. In the second Te site, Te(2) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. The Te(2)-O(1) bond length is 1.91 Å. The Te(2)-O(2) bond length is 1.91 Å. The Te(2)-O(3) bond length is 1.85 Å. In the third Te site, Te(3) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(5), and one O(6) atom. The Te(3)-O(1) bond length is 2.15 Å. The Te(3)-O(2) bond length is 2.13 Å. The Te(3)-O(5) bond length is 1.94 Å. The Te(3)-O(6) bond length is 1.84 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Te(2) and one Te(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Te(2) and one Te(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Tl(1), one Tl(2), and one Te(2) atom. In the fourth O site, O(4) is bonded in a water-like geometry to two equivalent Te(1) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Te(1) and one Te(3) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Tl(1), two equivalent Tl(2), and one Te(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to two equivalent Tl(1) and one Te(1) atom.