CuHgSeBr crystallizes in the orthorhombic Pmma space group. Cu(1) is bonded to two equivalent Se(1), one Br(1), and one Br(2) atom to form a mixture of edge and corner-sharing CuSe2Br2 tetrahedra. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a rectangular see-saw-like geometry to two equivalent Se(1) and two equivalent Br(1) atoms. In the second Hg site, Hg(2) is bonded in a linear geometry to two equivalent Se(1) atoms. Se(1) is bonded to two equivalent Cu(1), one Hg(1), and one Hg(2) atom to form corner-sharing SeCu2Hg2 trigonal pyramids. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 4-coordinate geometry to two equivalent Cu(1) and two equivalent Hg(1) atoms. In the second Br site, Br(2) is bonded in a 2-coordinate geometry to two equivalent Cu(1) atoms.
CuHgSeBr crystallizes in the orthorhombic Pmma space group. Cu(1) is bonded to two equivalent Se(1), one Br(1), and one Br(2) atom to form a mixture of edge and corner-sharing CuSe2Br2 tetrahedra. Both Cu(1)-Se(1) bond lengths are 2.41 Å. The Cu(1)-Br(1) bond length is 2.47 Å. The Cu(1)-Br(2) bond length is 2.63 Å. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a rectangular see-saw-like geometry to two equivalent Se(1) and two equivalent Br(1) atoms. Both Hg(1)-Se(1) bond lengths are 2.57 Å. Both Hg(1)-Br(1) bond lengths are 3.14 Å. In the second Hg site, Hg(2) is bonded in a linear geometry to two equivalent Se(1) atoms. Both Hg(2)-Se(1) bond lengths are 2.55 Å. Se(1) is bonded to two equivalent Cu(1), one Hg(1), and one Hg(2) atom to form corner-sharing SeCu2Hg2 trigonal pyramids. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 4-coordinate geometry to two equivalent Cu(1) and two equivalent Hg(1) atoms. In the second Br site, Br(2) is bonded in a 2-coordinate geometry to two equivalent Cu(1) atoms.