MgEr2Tl(WO4)4Tl crystallizes in the monoclinic C2 space group. The structure consists of two 7440-28-0 atoms inside a MgEr2Tl(WO4)4 framework. In the MgEr2Tl(WO4)4 framework, Mg(1) is bonded in a 4-coordinate geometry to one Tl(1), two equivalent O(1), and two equivalent O(6) atoms. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 6-coordinate geometry to two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(6), and two equivalent O(8) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 37-47°. In the second W site, W(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 37-47°. Tl(1) is bonded in a 7-coordinate geometry to one Mg(1), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one W(1), and one W(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one W(1), one W(2), and one Tl(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Er(2) and one W(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one W(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Er(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Er(2), one W(1), and one W(2) atom. In the seventh O site, O(7) is bonded in a T-shaped geometry to one Er(1), one W(1), and one Tl(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Er(2), one W(2), and one Tl(1) atom.
MgEr2Tl(WO4)4Tl crystallizes in the monoclinic C2 space group. The structure consists of two 7440-28-0 atoms inside a MgEr2Tl(WO4)4 framework. In the MgEr2Tl(WO4)4 framework, Mg(1) is bonded in a 4-coordinate geometry to one Tl(1), two equivalent O(1), and two equivalent O(6) atoms. The Mg(1)-Tl(1) bond length is 2.68 Å. Both Mg(1)-O(1) bond lengths are 1.95 Å. Both Mg(1)-O(6) bond lengths are 2.16 Å. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 6-coordinate geometry to two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms. Both Er(1)-O(4) bond lengths are 2.39 Å. Both Er(1)-O(5) bond lengths are 2.30 Å. Both Er(1)-O(7) bond lengths are 2.22 Å. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(6), and two equivalent O(8) atoms. Both Er(2)-O(3) bond lengths are 2.36 Å. Both Er(2)-O(6) bond lengths are 2.35 Å. Both Er(2)-O(8) bond lengths are 2.26 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 37-47°. The W(1)-O(1) bond length is 2.06 Å. The W(1)-O(2) bond length is 2.05 Å. The W(1)-O(3) bond length is 1.85 Å. The W(1)-O(5) bond length is 2.14 Å. The W(1)-O(6) bond length is 2.14 Å. The W(1)-O(7) bond length is 1.95 Å. In the second W site, W(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 37-47°. The W(2)-O(1) bond length is 2.04 Å. The W(2)-O(2) bond length is 1.92 Å. The W(2)-O(4) bond length is 1.85 Å. The W(2)-O(5) bond length is 2.01 Å. The W(2)-O(6) bond length is 2.18 Å. The W(2)-O(8) bond length is 1.84 Å. Tl(1) is bonded in a 7-coordinate geometry to one Mg(1), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms. Both Tl(1)-O(2) bond lengths are 2.77 Å. Both Tl(1)-O(7) bond lengths are 2.49 Å. Both Tl(1)-O(8) bond lengths are 2.71 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one W(1), and one W(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one W(1), one W(2), and one Tl(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Er(2) and one W(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one W(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Er(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Er(2), one W(1), and one W(2) atom. In the seventh O site, O(7) is bonded in a T-shaped geometry to one Er(1), one W(1), and one Tl(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Er(2), one W(2), and one Tl(1) atom.