U2N2Se crystallizes in the trigonal P-3m1 space group. U(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 U(1) atoms to form NU4 tetrahedra that share corners with six equivalent Se(1)U6 octahedra, corners with six equivalent N(1)U4 tetrahedra, edges with three equivalent Se(1)U6 octahedra, and edges with three equivalent N(1)U4 tetrahedra. The corner-sharing octahedral tilt angles range from 30-47°. Se(1) is bonded to six equivalent U(1) atoms to form distorted SeU6 octahedra that share corners with twelve equivalent N(1)U4 tetrahedra, edges with six equivalent Se(1)U6 octahedra, and edges with six equivalent N(1)U4 tetrahedra.
U2N2Se crystallizes in the trigonal P-3m1 space group. U(1) is bonded in a 7-coordinate geometry to four equivalent N(1) and three equivalent Se(1) atoms. There are three shorter (2.28 Å) and one longer (2.30 Å) U(1)-N(1) bond length. All U(1)-Se(1) bond lengths are 3.05 Å. N(1) is bonded to four equivalent U(1) atoms to form NU4 tetrahedra that share corners with six equivalent Se(1)U6 octahedra, corners with six equivalent N(1)U4 tetrahedra, edges with three equivalent Se(1)U6 octahedra, and edges with three equivalent N(1)U4 tetrahedra. The corner-sharing octahedral tilt angles range from 30-47°. Se(1) is bonded to six equivalent U(1) atoms to form distorted SeU6 octahedra that share corners with twelve equivalent N(1)U4 tetrahedra, edges with six equivalent Se(1)U6 octahedra, and edges with six equivalent N(1)U4 tetrahedra.