MgTb2Mo2(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. Tb(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), two equivalent O(2), two equivalent O(4), and one Cl(1) atom. 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 linear geometry to one Tb(1) and one Mo(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Tb(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 Tb(1), and one Mo(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Tb(1), and one Mo(1) atom. Cl(1) is bonded in a distorted single-bond geometry to one Mg(1) and one Tb(1) atom.
MgTb2Mo2(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 2.16 Å. Both Mg(1)-O(4) bond lengths are 2.08 Å. Both Mg(1)-Cl(1) bond lengths are 2.45 Å. Tb(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), two equivalent O(2), two equivalent O(4), and one Cl(1) atom. The Tb(1)-O(1) bond length is 2.27 Å. The Tb(1)-O(3) bond length is 2.23 Å. There is one shorter (2.30 Å) and one longer (2.42 Å) Tb(1)-O(2) bond length. There is one shorter (2.31 Å) and one longer (2.57 Å) Tb(1)-O(4) bond length. The Tb(1)-Cl(1) bond length is 2.94 Å. 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 1.80 Å. The Mo(1)-O(2) bond length is 1.85 Å. The Mo(1)-O(3) bond length is 1.90 Å. The Mo(1)-O(4) bond length is 1.95 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Tb(1) and one Mo(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Tb(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 Tb(1), and one Mo(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Tb(1), and one Mo(1) atom. Cl(1) is bonded in a distorted single-bond geometry to one Mg(1) and one Tb(1) atom.