Ce2SeN2 crystallizes in the trigonal P-3m1 space group. Ce(1) is bonded in a 7-coordinate geometry to four equivalent N(1) and three equivalent Se(1) atoms. N(1) is bonded to four equivalent Ce(1) atoms to form NCe4 tetrahedra that share corners with six equivalent Se(1)Ce6 octahedra, corners with six equivalent N(1)Ce4 tetrahedra, edges with three equivalent Se(1)Ce6 octahedra, and edges with three equivalent N(1)Ce4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-48°. Se(1) is bonded to six equivalent Ce(1) atoms to form SeCe6 octahedra that share corners with twelve equivalent N(1)Ce4 tetrahedra, edges with six equivalent Se(1)Ce6 octahedra, and edges with six equivalent N(1)Ce4 tetrahedra.
Ce2SeN2 crystallizes in the trigonal P-3m1 space group. Ce(1) is bonded in a 7-coordinate geometry to four equivalent N(1) and three equivalent Se(1) atoms. There is one shorter (2.29 Å) and three longer (2.33 Å) Ce(1)-N(1) bond lengths. All Ce(1)-Se(1) bond lengths are 3.07 Å. N(1) is bonded to four equivalent Ce(1) atoms to form NCe4 tetrahedra that share corners with six equivalent Se(1)Ce6 octahedra, corners with six equivalent N(1)Ce4 tetrahedra, edges with three equivalent Se(1)Ce6 octahedra, and edges with three equivalent N(1)Ce4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-48°. Se(1) is bonded to six equivalent Ce(1) atoms to form SeCe6 octahedra that share corners with twelve equivalent N(1)Ce4 tetrahedra, edges with six equivalent Se(1)Ce6 octahedra, and edges with six equivalent N(1)Ce4 tetrahedra.