AuCuSe4 crystallizes in the monoclinic P2_1/m space group. Au(1) is bonded in a square co-planar geometry to two equivalent Se(1) and two equivalent Se(3) atoms. Cu(1) is bonded in a distorted trigonal pyramidal geometry to one Se(2), one Se(3), and two equivalent Se(1) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted single-bond geometry to one Au(1), one Cu(1), and one Se(2) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one Cu(1) and two equivalent Se(1) atoms. In the third Se site, Se(3) is bonded in a distorted single-bond geometry to two equivalent Au(1) and one Cu(1) atom.
AuCuSe4 crystallizes in the monoclinic P2_1/m space group. Au(1) is bonded in a square co-planar geometry to two equivalent Se(1) and two equivalent Se(3) atoms. Both Au(1)-Se(1) bond lengths are 2.49 Å. Both Au(1)-Se(3) bond lengths are 2.51 Å. Cu(1) is bonded in a distorted trigonal pyramidal geometry to one Se(2), one Se(3), and two equivalent Se(1) atoms. The Cu(1)-Se(2) bond length is 2.40 Å. The Cu(1)-Se(3) bond length is 2.42 Å. Both Cu(1)-Se(1) bond lengths are 2.47 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted single-bond geometry to one Au(1), one Cu(1), and one Se(2) atom. The Se(1)-Se(2) bond length is 2.41 Å. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one Cu(1) and two equivalent Se(1) atoms. In the third Se site, Se(3) is bonded in a distorted single-bond geometry to two equivalent Au(1) and one Cu(1) atom.