MgSm2Mo2(O4Cl)2 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in an octahedral geometry to two equivalent O(3), two equivalent O(4), and two equivalent Cl(1) atoms. Sm(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), two equivalent O(1), two equivalent O(4), and two equivalent Cl(1) atoms. Mo(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sm(1) and one Mo(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Sm(1) and one Mo(1) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one Sm(1), and one Mo(1) atom. In the fourth O site, O(4) is bonded to one Mg(1), two equivalent Sm(1), and one Mo(1) atom to form distorted corner-sharing OSm2MgMo trigonal pyramids. Cl(1) is bonded in a 1-coordinate geometry to one Mg(1) and two equivalent Sm(1) atoms.
MgSm2Mo2(O4Cl)2 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in an octahedral geometry to two equivalent O(3), two equivalent O(4), and two equivalent Cl(1) atoms. Both Mg(1)-O(3) bond lengths are 2.11 Å. Both Mg(1)-O(4) bond lengths are 2.06 Å. Both Mg(1)-Cl(1) bond lengths are 2.48 Å. Sm(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), two equivalent O(1), two equivalent O(4), and two equivalent Cl(1) atoms. The Sm(1)-O(2) bond length is 2.32 Å. The Sm(1)-O(3) bond length is 2.29 Å. There is one shorter (2.35 Å) and one longer (2.57 Å) Sm(1)-O(1) bond length. There is one shorter (2.39 Å) and one longer (2.58 Å) Sm(1)-O(4) bond length. There is one shorter (2.97 Å) and one longer (3.33 Å) Sm(1)-Cl(1) bond length. Mo(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Mo(1)-O(1) bond length is 1.84 Å. The Mo(1)-O(2) bond length is 1.80 Å. The Mo(1)-O(3) bond length is 1.91 Å. The Mo(1)-O(4) bond length is 1.96 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sm(1) and one Mo(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Sm(1) and one Mo(1) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one Sm(1), and one Mo(1) atom. In the fourth O site, O(4) is bonded to one Mg(1), two equivalent Sm(1), and one Mo(1) atom to form distorted corner-sharing OSm2MgMo trigonal pyramids. Cl(1) is bonded in a 1-coordinate geometry to one Mg(1) and two equivalent Sm(1) atoms.