CsAuSe3 crystallizes in the triclinic P-1 space group. Cs(1) is bonded in a 11-coordinate geometry to three equivalent Au(1), two equivalent Se(1), two equivalent Se(2), and four equivalent Se(3) atoms. Au(1) is bonded in a 7-coordinate geometry to three equivalent Cs(1), two equivalent Se(1), and two equivalent Se(2) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to two equivalent Cs(1), two equivalent Au(1), and one Se(3) atom. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to two equivalent Cs(1), two equivalent Au(1), and one Se(3) atom. In the third Se site, Se(3) is bonded in a 6-coordinate geometry to four equivalent Cs(1), one Se(1), and one Se(2) atom.
CsAuSe3 crystallizes in the triclinic P-1 space group. Cs(1) is bonded in a 11-coordinate geometry to three equivalent Au(1), two equivalent Se(1), two equivalent Se(2), and four equivalent Se(3) atoms. There is one shorter (3.81 Å) and two longer (4.19 Å) Cs(1)-Au(1) bond lengths. There is one shorter (3.62 Å) and one longer (3.80 Å) Cs(1)-Se(1) bond length. There is one shorter (3.62 Å) and one longer (3.81 Å) Cs(1)-Se(2) bond length. There are a spread of Cs(1)-Se(3) bond distances ranging from 3.91-3.97 Å. Au(1) is bonded in a 7-coordinate geometry to three equivalent Cs(1), two equivalent Se(1), and two equivalent Se(2) atoms. There is one shorter (2.42 Å) and one longer (3.24 Å) Au(1)-Se(1) bond length. There is one shorter (2.42 Å) and one longer (3.23 Å) Au(1)-Se(2) bond length. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to two equivalent Cs(1), two equivalent Au(1), and one Se(3) atom. The Se(1)-Se(3) bond length is 2.40 Å. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to two equivalent Cs(1), two equivalent Au(1), and one Se(3) atom. The Se(2)-Se(3) bond length is 2.40 Å. In the third Se site, Se(3) is bonded in a 6-coordinate geometry to four equivalent Cs(1), one Se(1), and one Se(2) atom.