Sm2Ti2S2O5 crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded in a 9-coordinate geometry to five equivalent S(1) and four equivalent O(1) atoms. Ti(1) is bonded to one S(1), one O(2), and four equivalent O(1) atoms to form distorted corner-sharing TiSO5 trigonal bipyramids. S(1) is bonded in a 6-coordinate geometry to five equivalent Sm(1) and one Ti(1) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Ti(1) atoms to form a mixture of distorted corner and edge-sharing OSm2Ti2 trigonal pyramids. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ti(1) atoms.
Sm2Ti2S2O5 crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded in a 9-coordinate geometry to five equivalent S(1) and four equivalent O(1) atoms. There are four shorter (2.86 Å) and one longer (3.01 Å) Sm(1)-S(1) bond length. All Sm(1)-O(1) bond lengths are 2.49 Å. Ti(1) is bonded to one S(1), one O(2), and four equivalent O(1) atoms to form distorted corner-sharing TiSO5 trigonal bipyramids. The Ti(1)-S(1) bond length is 2.93 Å. The Ti(1)-O(2) bond length is 1.81 Å. All Ti(1)-O(1) bond lengths are 1.97 Å. S(1) is bonded in a 6-coordinate geometry to five equivalent Sm(1) and one Ti(1) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Ti(1) atoms to form a mixture of distorted corner and edge-sharing OSm2Ti2 trigonal pyramids. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ti(1) atoms.