TmSm2S4 crystallizes in the tetragonal I-42d space group. Tm(1) is bonded in a 8-coordinate geometry to eight equivalent S(1) atoms. Sm(1) is bonded in a 8-coordinate geometry to eight equivalent S(1) atoms. S(1) is bonded to two equivalent Tm(1) and four equivalent Sm(1) atoms to form a mixture of distorted corner, face, and edge-sharing SSm4Tm2 octahedra. The corner-sharing octahedral tilt angles range from 15-51°.
TmSm2S4 crystallizes in the tetragonal I-42d space group. Tm(1) is bonded in a 8-coordinate geometry to eight equivalent S(1) atoms. There are four shorter (2.73 Å) and four longer (3.05 Å) Tm(1)-S(1) bond lengths. Sm(1) is bonded in a 8-coordinate geometry to eight equivalent S(1) atoms. There are a spread of Sm(1)-S(1) bond distances ranging from 2.82-3.05 Å. S(1) is bonded to two equivalent Tm(1) and four equivalent Sm(1) atoms to form a mixture of distorted corner, face, and edge-sharing SSm4Tm2 octahedra. The corner-sharing octahedral tilt angles range from 15-51°.