Tl(Hg3(SeBr)2)2Br crystallizes in the tetragonal I4/m space group. The structure consists of four 7440-28-0 atoms and four hydrogen bromide atoms inside a Hg3(SeBr)2 framework. In the Hg3(SeBr)2 framework, there are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Se(1), one Br(3), and one Br(4) atom. In the second Hg site, Hg(2) is bonded in a 4-coordinate geometry to two equivalent Se(1), one Br(3), and one Br(4) atom. Se(1) is bonded in a distorted T-shaped geometry to one Hg(2) and two equivalent Hg(1) atoms. There are two inequivalent Br sites. In the first Br site, Br(3) is bonded in a 3-coordinate geometry to one Hg(2) and two equivalent Hg(1) atoms. In the second Br site, Br(4) is bonded in a 3-coordinate geometry to one Hg(2) and two equivalent Hg(1) atoms.
Tl(Hg3(SeBr)2)2Br crystallizes in the tetragonal I4/m space group. The structure consists of four 7440-28-0 atoms and four hydrogen bromide atoms inside a Hg3(SeBr)2 framework. In the Hg3(SeBr)2 framework, there are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Se(1), one Br(3), and one Br(4) atom. There is one shorter (2.56 Å) and one longer (2.57 Å) Hg(1)-Se(1) bond length. The Hg(1)-Br(3) bond length is 3.20 Å. The Hg(1)-Br(4) bond length is 3.16 Å. In the second Hg site, Hg(2) is bonded in a 4-coordinate geometry to two equivalent Se(1), one Br(3), and one Br(4) atom. Both Hg(2)-Se(1) bond lengths are 2.57 Å. The Hg(2)-Br(3) bond length is 2.88 Å. The Hg(2)-Br(4) bond length is 3.22 Å. Se(1) is bonded in a distorted T-shaped geometry to one Hg(2) and two equivalent Hg(1) atoms. There are two inequivalent Br sites. In the first Br site, Br(3) is bonded in a 3-coordinate geometry to one Hg(2) and two equivalent Hg(1) atoms. In the second Br site, Br(4) is bonded in a 3-coordinate geometry to one Hg(2) and two equivalent Hg(1) atoms.