Ga2Se3 crystallizes in the monoclinic Cc space group. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a distorted L-shaped geometry to one Se(2) and two equivalent Se(1) atoms. In the second Ga site, Ga(2) is bonded in a trigonal planar geometry to one Se(1), one Se(2), and one Se(3) atom. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to one Ga(2), two equivalent Ga(1), and one Se(3) atom. In the second Se site, Se(2) is bonded in a water-like geometry to one Ga(1) and one Ga(2) atom. In the third Se site, Se(3) is bonded in a distorted single-bond geometry to one Ga(2) and one Se(1) atom.
Ga2Se3 crystallizes in the monoclinic Cc space group. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a distorted L-shaped geometry to one Se(2) and two equivalent Se(1) atoms. The Ga(1)-Se(2) bond length is 2.64 Å. There is one shorter (2.97 Å) and one longer (3.16 Å) Ga(1)-Se(1) bond length. In the second Ga site, Ga(2) is bonded in a trigonal planar geometry to one Se(1), one Se(2), and one Se(3) atom. The Ga(2)-Se(1) bond length is 2.47 Å. The Ga(2)-Se(2) bond length is 2.27 Å. The Ga(2)-Se(3) bond length is 2.40 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to one Ga(2), two equivalent Ga(1), and one Se(3) atom. The Se(1)-Se(3) bond length is 2.38 Å. In the second Se site, Se(2) is bonded in a water-like geometry to one Ga(1) and one Ga(2) atom. In the third Se site, Se(3) is bonded in a distorted single-bond geometry to one Ga(2) and one Se(1) atom.