As4Se3 is beta Np structured and crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four 3,5,7-triselena-1,2,4,6-tetrarsatricyclo[2.2.1.02,6]heptane molecules. There are three inequivalent As sites. In the first As site, As(1) is bonded in a distorted single-bond geometry to two equivalent As(3) and one Se(2) atom. In the second As site, As(2) is bonded in a distorted trigonal non-coplanar geometry to one Se(2) and two equivalent Se(1) atoms. In the third As site, As(3) is bonded in a distorted single-bond geometry to one As(1) and one Se(1) atom. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a water-like geometry to one As(2) and one As(3) atom. In the second Se site, Se(2) is bonded in a water-like geometry to one As(1) and one As(2) atom.
As4Se3 is beta Np structured and crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four 3,5,7-triselena-1,2,4,6-tetrarsatricyclo[2.2.1.02,6]heptane molecules. There are three inequivalent As sites. In the first As site, As(1) is bonded in a distorted single-bond geometry to two equivalent As(3) and one Se(2) atom. Both As(1)-As(3) bond lengths are 2.48 Å. The As(1)-Se(2) bond length is 2.36 Å. In the second As site, As(2) is bonded in a distorted trigonal non-coplanar geometry to one Se(2) and two equivalent Se(1) atoms. The As(2)-Se(2) bond length is 2.39 Å. Both As(2)-Se(1) bond lengths are 2.39 Å. In the third As site, As(3) is bonded in a distorted single-bond geometry to one As(1) and one Se(1) atom. The As(3)-Se(1) bond length is 2.36 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a water-like geometry to one As(2) and one As(3) atom. In the second Se site, Se(2) is bonded in a water-like geometry to one As(1) and one As(2) atom.