LiAsSe2 crystallizes in the monoclinic Cc space group. Li(1) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of corner and edge-sharing LiSe6 octahedra. The corner-sharing octahedral tilt angles range from 7-9°. As(1) is bonded in a distorted trigonal non-coplanar geometry to one Se(2) and two equivalent Se(1) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted see-saw-like geometry to two equivalent Li(1) and two equivalent As(1) atoms. In the second Se site, Se(2) is bonded to four equivalent Li(1) and one As(1) atom to form a mixture of corner and edge-sharing SeLi4As square pyramids.
LiAsSe2 crystallizes in the monoclinic Cc space group. Li(1) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of corner and edge-sharing LiSe6 octahedra. The corner-sharing octahedral tilt angles range from 7-9°. There is one shorter (2.79 Å) and one longer (2.99 Å) Li(1)-Se(1) bond length. There are a spread of Li(1)-Se(2) bond distances ranging from 2.78-2.84 Å. As(1) is bonded in a distorted trigonal non-coplanar geometry to one Se(2) and two equivalent Se(1) atoms. The As(1)-Se(2) bond length is 2.33 Å. There is one shorter (2.48 Å) and one longer (2.50 Å) As(1)-Se(1) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted see-saw-like geometry to two equivalent Li(1) and two equivalent As(1) atoms. In the second Se site, Se(2) is bonded to four equivalent Li(1) and one As(1) atom to form a mixture of corner and edge-sharing SeLi4As square pyramids.