K3AsSe3 crystallizes in the cubic P2_13 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. In the third K site, K(3) is bonded to six equivalent Se(1) atoms to form distorted corner-sharing KSe6 octahedra. The corner-sharing octahedral tilt angles are 63°. As(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Se(1) atoms. Se(1) is bonded to two equivalent K(1), two equivalent K(2), two equivalent K(3), and one As(1) atom to form a mixture of distorted face, corner, and edge-sharing SeK6As pentagonal bipyramids.
K3AsSe3 crystallizes in the cubic P2_13 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. There are three shorter (3.26 Å) and three longer (3.42 Å) K(1)-Se(1) bond lengths. In the second K site, K(2) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. There are three shorter (3.28 Å) and three longer (3.37 Å) K(2)-Se(1) bond lengths. In the third K site, K(3) is bonded to six equivalent Se(1) atoms to form distorted corner-sharing KSe6 octahedra. The corner-sharing octahedral tilt angles are 63°. There are three shorter (3.48 Å) and three longer (3.69 Å) K(3)-Se(1) bond lengths. As(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Se(1) atoms. All As(1)-Se(1) bond lengths are 2.41 Å. Se(1) is bonded to two equivalent K(1), two equivalent K(2), two equivalent K(3), and one As(1) atom to form a mixture of distorted face, corner, and edge-sharing SeK6As pentagonal bipyramids.