MgTm2W2(O4Cl)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(5), one Cl(1), and one Cl(2) atom to form distorted MgCl2O4 octahedra that share  a cornercorner with one W(2)O5 trigonal bipyramid, corners with two equivalent W(1)O5 trigonal bipyramids, and  an edgeedge with one W(2)O5 trigonal bipyramid. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(7), one O(8), and one Cl(2) atom. In the second Tm site, Tm(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(6), one O(7), one O(8), and one Cl(1) atom. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(3), one O(4), one O(6), and one O(7) atom to form distorted WO5 trigonal bipyramids that share corners with two equivalent Mg(1)Cl2O4 octahedra and  an edgeedge with one W(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 39-65°. In the second W site, W(2) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(8) atom to form distorted WO5 trigonal bipyramids that share  a cornercorner with one Mg(1)Cl2O4 octahedra,  an edgeedge with one Mg(1)Cl2O4 octahedra, and  an edgeedge with one W(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 51°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Tm(1), and one W(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mg(1), one Tm(2), and one W(2) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Mg(1), one Tm(1), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Tm(2), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Tm(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Tm(2) and one W(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Tm(1), one Tm(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Tm(1), one Tm(2), and one W(2) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a water-like geometry to one Mg(1) and one Tm(2) atom. In the second Cl site, Cl(2) is bonded in a bent 120 degrees geometry to one Mg(1) and one Tm(1) atom.
MgTm2W2(O4Cl)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(5), one Cl(1), and one Cl(2) atom to form distorted MgCl2O4 octahedra that share  a cornercorner with one W(2)O5 trigonal bipyramid, corners with two equivalent W(1)O5 trigonal bipyramids, and  an edgeedge with one W(2)O5 trigonal bipyramid. The Mg(1)-O(1) bond length is 2.16 Å. The Mg(1)-O(2) bond length is 2.07 Å. The Mg(1)-O(3) bond length is 2.09 Å. The Mg(1)-O(5) bond length is 2.26 Å. The Mg(1)-Cl(1) bond length is 2.42 Å. The Mg(1)-Cl(2) bond length is 2.68 Å. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(7), one O(8), and one Cl(2) atom. The Tm(1)-O(1) bond length is 2.15 Å. The Tm(1)-O(3) bond length is 2.34 Å. The Tm(1)-O(5) bond length is 2.34 Å. The Tm(1)-O(7) bond length is 2.31 Å. The Tm(1)-O(8) bond length is 2.15 Å. The Tm(1)-Cl(2) bond length is 2.66 Å. In the second Tm site, Tm(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(6), one O(7), one O(8), and one Cl(1) atom. The Tm(2)-O(2) bond length is 2.14 Å. The Tm(2)-O(4) bond length is 2.29 Å. The Tm(2)-O(6) bond length is 2.21 Å. The Tm(2)-O(7) bond length is 2.22 Å. The Tm(2)-O(8) bond length is 2.34 Å. The Tm(2)-Cl(1) bond length is 2.73 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(3), one O(4), one O(6), and one O(7) atom to form distorted WO5 trigonal bipyramids that share corners with two equivalent Mg(1)Cl2O4 octahedra and  an edgeedge with one W(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 39-65°. The W(1)-O(1) bond length is 1.95 Å. The W(1)-O(3) bond length is 2.21 Å. The W(1)-O(4) bond length is 1.98 Å. The W(1)-O(6) bond length is 1.82 Å. The W(1)-O(7) bond length is 1.94 Å. In the second W site, W(2) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(8) atom to form distorted WO5 trigonal bipyramids that share  a cornercorner with one Mg(1)Cl2O4 octahedra,  an edgeedge with one Mg(1)Cl2O4 octahedra, and  an edgeedge with one W(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 51°. The W(2)-O(2) bond length is 1.97 Å. The W(2)-O(3) bond length is 2.02 Å. The W(2)-O(4) bond length is 2.08 Å. The W(2)-O(5) bond length is 1.83 Å. The W(2)-O(8) bond length is 1.93 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Tm(1), and one W(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mg(1), one Tm(2), and one W(2) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Mg(1), one Tm(1), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Tm(2), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Tm(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Tm(2) and one W(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Tm(1), one Tm(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Tm(1), one Tm(2), and one W(2) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a water-like geometry to one Mg(1) and one Tm(2) atom. In the second Cl site, Cl(2) is bonded in a bent 120 degrees geometry to one Mg(1) and one Tm(1) atom.