EuNd2S4 crystallizes in the tetragonal I-42d space group. Eu(1) is bonded to eight equivalent S(1) atoms to form distorted EuS8 hexagonal bipyramids that share corners with eight equivalent Nd(1)S8 hexagonal bipyramids, edges with four equivalent Eu(1)S8 hexagonal bipyramids, and faces with eight equivalent Nd(1)S8 hexagonal bipyramids. Nd(1) is bonded to eight equivalent S(1) atoms to form distorted NdS8 hexagonal bipyramids that share corners with four equivalent Eu(1)S8 hexagonal bipyramids, corners with four equivalent Nd(1)S8 hexagonal bipyramids, edges with four equivalent Nd(1)S8 hexagonal bipyramids, faces with four equivalent Eu(1)S8 hexagonal bipyramids, and faces with four equivalent Nd(1)S8 hexagonal bipyramids. S(1) is bonded to two equivalent Eu(1) and four equivalent Nd(1) atoms to form a mixture of distorted corner, edge, and face-sharing SNd4Eu2 octahedra. The corner-sharing octahedral tilt angles range from 16-51°.
EuNd2S4 crystallizes in the tetragonal I-42d space group. Eu(1) is bonded to eight equivalent S(1) atoms to form distorted EuS8 hexagonal bipyramids that share corners with eight equivalent Nd(1)S8 hexagonal bipyramids, edges with four equivalent Eu(1)S8 hexagonal bipyramids, and faces with eight equivalent Nd(1)S8 hexagonal bipyramids. There are four shorter (2.92 Å) and four longer (3.10 Å) Eu(1)-S(1) bond lengths. Nd(1) is bonded to eight equivalent S(1) atoms to form distorted NdS8 hexagonal bipyramids that share corners with four equivalent Eu(1)S8 hexagonal bipyramids, corners with four equivalent Nd(1)S8 hexagonal bipyramids, edges with four equivalent Nd(1)S8 hexagonal bipyramids, faces with four equivalent Eu(1)S8 hexagonal bipyramids, and faces with four equivalent Nd(1)S8 hexagonal bipyramids. There are a spread of Nd(1)-S(1) bond distances ranging from 2.86-3.08 Å. S(1) is bonded to two equivalent Eu(1) and four equivalent Nd(1) atoms to form a mixture of distorted corner, edge, and face-sharing SNd4Eu2 octahedra. The corner-sharing octahedral tilt angles range from 16-51°.