NaNdSe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Na(1) is bonded to six equivalent Se(1) atoms to form NaSe6 octahedra that share corners with six equivalent Nd(1)Se6 octahedra, edges with six equivalent Na(1)Se6 octahedra, and edges with six equivalent Nd(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 2°. Nd(1) is bonded to six equivalent Se(1) atoms to form NdSe6 octahedra that share corners with six equivalent Na(1)Se6 octahedra, edges with six equivalent Na(1)Se6 octahedra, and edges with six equivalent Nd(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 2°. Se(1) is bonded to three equivalent Na(1) and three equivalent Nd(1) atoms to form a mixture of corner and edge-sharing SeNa3Nd3 octahedra. The corner-sharing octahedra are not tilted.
NaNdSe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Na(1) is bonded to six equivalent Se(1) atoms to form NaSe6 octahedra that share corners with six equivalent Nd(1)Se6 octahedra, edges with six equivalent Na(1)Se6 octahedra, and edges with six equivalent Nd(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 2°. All Na(1)-Se(1) bond lengths are 3.06 Å. Nd(1) is bonded to six equivalent Se(1) atoms to form NdSe6 octahedra that share corners with six equivalent Na(1)Se6 octahedra, edges with six equivalent Na(1)Se6 octahedra, and edges with six equivalent Nd(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 2°. All Nd(1)-Se(1) bond lengths are 2.97 Å. Se(1) is bonded to three equivalent Na(1) and three equivalent Nd(1) atoms to form a mixture of corner and edge-sharing SeNa3Nd3 octahedra. The corner-sharing octahedra are not tilted.