SmGa2S4 crystallizes in the orthorhombic Cccm space group. Sm(1) is bonded in a 8-coordinate geometry to four equivalent S(1) and four equivalent S(2) atoms. Ga(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form edge-sharing GaS4 tetrahedra. There are two inequivalent S sites. In the first S site, S(2) is bonded to two equivalent Sm(1) and two equivalent Ga(1) atoms to form a mixture of distorted corner and edge-sharing SSm2Ga2 trigonal pyramids. In the second S site, S(1) is bonded to two equivalent Sm(1) and two equivalent Ga(1) atoms to form a mixture of corner and edge-sharing SSm2Ga2 trigonal pyramids.
SmGa2S4 crystallizes in the orthorhombic Cccm space group. Sm(1) is bonded in a 8-coordinate geometry to four equivalent S(1) and four equivalent S(2) atoms. All Sm(1)-S(1) bond lengths are 2.92 Å. All Sm(1)-S(2) bond lengths are 2.98 Å. Ga(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form edge-sharing GaS4 tetrahedra. There is one shorter (2.34 Å) and one longer (2.45 Å) Ga(1)-S(1) bond length. Both Ga(1)-S(2) bond lengths are 2.39 Å. There are two inequivalent S sites. In the first S site, S(2) is bonded to two equivalent Sm(1) and two equivalent Ga(1) atoms to form a mixture of distorted corner and edge-sharing SSm2Ga2 trigonal pyramids. In the second S site, S(1) is bonded to two equivalent Sm(1) and two equivalent Ga(1) atoms to form a mixture of corner and edge-sharing SSm2Ga2 trigonal pyramids.