MgTb2Mo2(O4Cl)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(8), one Cl(1), and one Cl(2) atom. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one Cl(1), and one Cl(2) atom. In the second Tb site, Tb(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), one Cl(1), and one Cl(2) atom. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a distorted tetrahedral geometry to one O(1), one O(5), one O(7), and one O(8) atom. In the second Mo site, Mo(2) is bonded in a distorted tetrahedral geometry to one O(2), one O(3), one O(4), and one O(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Mg(1), one Tb(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Tb(1), one Tb(2), and one Mo(2) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one Tb(2), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1), one Tb(1), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Tb(1), one Tb(2), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Tb(1), one Tb(2), and one Mo(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Tb(1), one Tb(2), and one Mo(1) atom. In the eighth O site, O(8) is bonded in a T-shaped geometry to one Mg(1), one Tb(2), and one Mo(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Tb(1), and one Tb(2) atom. In the second Cl site, Cl(2) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Tb(1), and one Tb(2) atom.
MgTb2Mo2(O4Cl)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(8), one Cl(1), and one Cl(2) atom. The Mg(1)-O(1) bond length is 2.13 Å. The Mg(1)-O(3) bond length is 2.13 Å. The Mg(1)-O(4) bond length is 2.19 Å. The Mg(1)-O(8) bond length is 2.19 Å. The Mg(1)-Cl(1) bond length is 2.57 Å. The Mg(1)-Cl(2) bond length is 2.57 Å. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one Cl(1), and one Cl(2) atom. The Tb(1)-O(1) bond length is 2.36 Å. The Tb(1)-O(2) bond length is 2.31 Å. The Tb(1)-O(4) bond length is 2.29 Å. The Tb(1)-O(5) bond length is 2.53 Å. The Tb(1)-O(6) bond length is 2.28 Å. The Tb(1)-O(7) bond length is 2.41 Å. The Tb(1)-Cl(1) bond length is 2.93 Å. The Tb(1)-Cl(2) bond length is 3.06 Å. In the second Tb site, Tb(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), one Cl(1), and one Cl(2) atom. The Tb(2)-O(2) bond length is 2.53 Å. The Tb(2)-O(3) bond length is 2.36 Å. The Tb(2)-O(5) bond length is 2.31 Å. The Tb(2)-O(6) bond length is 2.40 Å. The Tb(2)-O(7) bond length is 2.28 Å. The Tb(2)-O(8) bond length is 2.28 Å. The Tb(2)-Cl(1) bond length is 3.07 Å. The Tb(2)-Cl(2) bond length is 2.94 Å. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a distorted tetrahedral geometry to one O(1), one O(5), one O(7), and one O(8) atom. The Mo(1)-O(1) bond length is 1.87 Å. The Mo(1)-O(5) bond length is 1.85 Å. The Mo(1)-O(7) bond length is 1.87 Å. The Mo(1)-O(8) bond length is 1.87 Å. In the second Mo site, Mo(2) is bonded in a distorted tetrahedral geometry to one O(2), one O(3), one O(4), and one O(6) atom. The Mo(2)-O(2) bond length is 1.85 Å. The Mo(2)-O(3) bond length is 1.87 Å. The Mo(2)-O(4) bond length is 1.87 Å. The Mo(2)-O(6) bond length is 1.87 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Mg(1), one Tb(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Tb(1), one Tb(2), and one Mo(2) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one Tb(2), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1), one Tb(1), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Tb(1), one Tb(2), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Tb(1), one Tb(2), and one Mo(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Tb(1), one Tb(2), and one Mo(1) atom. In the eighth O site, O(8) is bonded in a T-shaped geometry to one Mg(1), one Tb(2), and one Mo(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Tb(1), and one Tb(2) atom. In the second Cl site, Cl(2) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Tb(1), and one Tb(2) atom.