Eu(ErS2)2 crystallizes in the tetragonal I-42d space group. Er(1) is bonded in a 8-coordinate geometry to eight equivalent S(1) atoms. Eu(1) is bonded to eight equivalent S(1) atoms to form distorted edge-sharing EuS8 hexagonal bipyramids. S(1) is bonded to four equivalent Er(1) and two equivalent Eu(1) atoms to form a mixture of distorted corner, edge, and face-sharing SEu2Er4 octahedra. The corner-sharing octahedral tilt angles range from 17-50°.
Eu(ErS2)2 crystallizes in the tetragonal I-42d space group. Er(1) is bonded in a 8-coordinate geometry to eight equivalent S(1) atoms. There are a spread of Er(1)-S(1) bond distances ranging from 2.73-3.05 Å. Eu(1) is bonded to eight equivalent S(1) atoms to form distorted edge-sharing EuS8 hexagonal bipyramids. There are four shorter (2.88 Å) and four longer (3.05 Å) Eu(1)-S(1) bond lengths. S(1) is bonded to four equivalent Er(1) and two equivalent Eu(1) atoms to form a mixture of distorted corner, edge, and face-sharing SEu2Er4 octahedra. The corner-sharing octahedral tilt angles range from 17-50°.