AsSe is Indium-like structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four 2,4,6,8-tetraselena-1,3,5,7-tetrarsatricyclo[3.3.0.03,7]octane molecules. There are four inequivalent As sites. In the first As site, As(1) is bonded in a distorted L-shaped geometry to one As(4), one Se(1), and one Se(2) atom. In the second As site, As(2) is bonded in a distorted L-shaped geometry to one As(3), one Se(1), and one Se(3) atom. In the third As site, As(3) is bonded in a distorted L-shaped geometry to one As(2), one Se(2), and one Se(4) atom. In the fourth As site, As(4) is bonded in a distorted L-shaped geometry to one As(1), one Se(3), and one Se(4) atom. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a water-like geometry to one As(1) and one As(2) atom. In the second Se site, Se(2) is bonded in a water-like geometry to one As(1) and one As(3) atom. In the third Se site, Se(3) is bonded in a water-like geometry to one As(2) and one As(4) atom. In the fourth Se site, Se(4) is bonded in a water-like geometry to one As(3) and one As(4) atom.
AsSe is Indium-like structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four 2,4,6,8-tetraselena-1,3,5,7-tetrarsatricyclo[3.3.0.03,7]octane molecules. There are four inequivalent As sites. In the first As site, As(1) is bonded in a distorted L-shaped geometry to one As(4), one Se(1), and one Se(2) atom. The As(1)-As(4) bond length is 2.59 Å. The As(1)-Se(1) bond length is 2.39 Å. The As(1)-Se(2) bond length is 2.39 Å. In the second As site, As(2) is bonded in a distorted L-shaped geometry to one As(3), one Se(1), and one Se(3) atom. The As(2)-As(3) bond length is 2.58 Å. The As(2)-Se(1) bond length is 2.39 Å. The As(2)-Se(3) bond length is 2.39 Å. In the third As site, As(3) is bonded in a distorted L-shaped geometry to one As(2), one Se(2), and one Se(4) atom. The As(3)-Se(2) bond length is 2.39 Å. The As(3)-Se(4) bond length is 2.39 Å. In the fourth As site, As(4) is bonded in a distorted L-shaped geometry to one As(1), one Se(3), and one Se(4) atom. The As(4)-Se(3) bond length is 2.38 Å. The As(4)-Se(4) bond length is 2.38 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a water-like geometry to one As(1) and one As(2) atom. In the second Se site, Se(2) is bonded in a water-like geometry to one As(1) and one As(3) atom. In the third Se site, Se(3) is bonded in a water-like geometry to one As(2) and one As(4) atom. In the fourth Se site, Se(4) is bonded in a water-like geometry to one As(3) and one As(4) atom.