La2O2S crystallizes in the trigonal P-3m1 space group. La(1) is bonded in a 7-coordinate geometry to three equivalent S(1) and four equivalent O(1) atoms. S(1) is bonded to six equivalent La(1) atoms to form SLa6 octahedra that share corners with twelve equivalent O(1)La4 tetrahedra, edges with six equivalent S(1)La6 octahedra, and edges with six equivalent O(1)La4 tetrahedra. O(1) is bonded to four equivalent La(1) atoms to form OLa4 tetrahedra that share corners with six equivalent S(1)La6 octahedra, corners with six equivalent O(1)La4 tetrahedra, edges with three equivalent S(1)La6 octahedra, and edges with three equivalent O(1)La4 tetrahedra. The corner-sharing octahedral tilt angles range from 25-50°.
La2O2S crystallizes in the trigonal P-3m1 space group. La(1) is bonded in a 7-coordinate geometry to three equivalent S(1) and four equivalent O(1) atoms. All La(1)-S(1) bond lengths are 3.05 Å. There is one shorter (2.42 Å) and three longer (2.43 Å) La(1)-O(1) bond lengths. S(1) is bonded to six equivalent La(1) atoms to form SLa6 octahedra that share corners with twelve equivalent O(1)La4 tetrahedra, edges with six equivalent S(1)La6 octahedra, and edges with six equivalent O(1)La4 tetrahedra. O(1) is bonded to four equivalent La(1) atoms to form OLa4 tetrahedra that share corners with six equivalent S(1)La6 octahedra, corners with six equivalent O(1)La4 tetrahedra, edges with three equivalent S(1)La6 octahedra, and edges with three equivalent O(1)La4 tetrahedra. The corner-sharing octahedral tilt angles range from 25-50°.