MgSm2Ti2(O3Cl)2 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent O(2) and four equivalent Cl(1) atoms to form edge-sharing MgCl4O2 octahedra. Sm(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), two equivalent O(2), and three equivalent Cl(1) atoms. Ti(1) is bonded in a 6-coordinate geometry to one O(2), two equivalent O(3), and three equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sm(1) and three equivalent Ti(1) atoms. In the second O site, O(2) is bonded to one Mg(1), two equivalent Sm(1), and one Ti(1) atom to form distorted corner-sharing OSm2MgTi trigonal pyramids. In the third O site, O(3) is bonded in a T-shaped geometry to one Sm(1) and two equivalent Ti(1) atoms. Cl(1) is bonded in a 5-coordinate geometry to two equivalent Mg(1) and three equivalent Sm(1) atoms.
MgSm2Ti2(O3Cl)2 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent O(2) and four equivalent Cl(1) atoms to form edge-sharing MgCl4O2 octahedra. Both Mg(1)-O(2) bond lengths are 2.01 Å. All Mg(1)-Cl(1) bond lengths are 2.58 Å. Sm(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), two equivalent O(2), and three equivalent Cl(1) atoms. The Sm(1)-O(1) bond length is 2.28 Å. The Sm(1)-O(3) bond length is 2.23 Å. Both Sm(1)-O(2) bond lengths are 2.26 Å. There is one shorter (2.97 Å) and two longer (3.10 Å) Sm(1)-Cl(1) bond lengths. Ti(1) is bonded in a 6-coordinate geometry to one O(2), two equivalent O(3), and three equivalent O(1) atoms. The Ti(1)-O(2) bond length is 2.42 Å. There is one shorter (1.93 Å) and one longer (1.99 Å) Ti(1)-O(3) bond length. There are two shorter (2.03 Å) and one longer (2.61 Å) Ti(1)-O(1) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sm(1) and three equivalent Ti(1) atoms. In the second O site, O(2) is bonded to one Mg(1), two equivalent Sm(1), and one Ti(1) atom to form distorted corner-sharing OSm2MgTi trigonal pyramids. In the third O site, O(3) is bonded in a T-shaped geometry to one Sm(1) and two equivalent Ti(1) atoms. Cl(1) is bonded in a 5-coordinate geometry to two equivalent Mg(1) and three equivalent Sm(1) atoms.