MgHo2Mo2(O4Cl)2 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(3), and two equivalent Cl(1) atoms. Ho(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), two equivalent O(3), 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 T-shaped geometry to one Mg(1), one Ho(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Ho(1) and one Mo(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Ho(1), and one Mo(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ho(1) and one Mo(1) atom. Cl(1) is bonded in a distorted single-bond geometry to one Mg(1) and one Ho(1) atom.
MgHo2Mo2(O4Cl)2 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(3), and two equivalent Cl(1) atoms. Both Mg(1)-O(1) bond lengths are 2.16 Å. Both Mg(1)-O(3) bond lengths are 2.07 Å. Both Mg(1)-Cl(1) bond lengths are 2.44 Å. Ho(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), two equivalent O(3), two equivalent O(4), and one Cl(1) atom. The Ho(1)-O(1) bond length is 2.21 Å. The Ho(1)-O(2) bond length is 2.26 Å. There is one shorter (2.28 Å) and one longer (2.54 Å) Ho(1)-O(3) bond length. There is one shorter (2.27 Å) and one longer (2.39 Å) Ho(1)-O(4) bond length. The Ho(1)-Cl(1) bond length is 2.93 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 1.90 Å. The Mo(1)-O(2) bond length is 1.79 Å. The Mo(1)-O(3) bond length is 1.95 Å. The Mo(1)-O(4) bond length is 1.86 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Mg(1), one Ho(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Ho(1) and one Mo(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Ho(1), and one Mo(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ho(1) and one Mo(1) atom. Cl(1) is bonded in a distorted single-bond geometry to one Mg(1) and one Ho(1) atom.