MgDy6(Sb5O12)2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 3-coordinate geometry to one O(6) and two equivalent O(9) atoms. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(2), one O(3), one O(4), one O(6), and one O(7) atom. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(2), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. In the third Dy site, Dy(3) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(14), one O(5), one O(8), and one O(9) atom. There are seven inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 3-coordinate geometry to one O(14) and two equivalent O(1) atoms. In the second Sb site, Sb(2) is bonded in a 4-coordinate geometry to one O(1), one O(11), one O(4), and one O(8) atom. In the third Sb site, Sb(3) is bonded in a 3-coordinate geometry to one O(2), one O(5), and one O(7) atom. In the fourth Sb site, Sb(4) is bonded in a 3-coordinate geometry to one O(10), one O(7), and one O(8) atom. In the fifth Sb site, Sb(5) is bonded in a 3-coordinate geometry to one O(6), two equivalent O(4), and two equivalent O(9) atoms. In the sixth Sb site, Sb(6) is bonded in a 4-coordinate geometry to one O(12), one O(3), and two equivalent O(10) atoms. In the seventh Sb site, Sb(7) is bonded in a 3-coordinate geometry to one O(14) and two equivalent O(13) atoms. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(2), one Sb(1), and one Sb(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Dy(1), one Dy(2), and one Sb(3) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Dy(1) and one Sb(6) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(2), one Sb(2), and one Sb(5) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Dy(2), one Dy(3), and one Sb(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), two equivalent Dy(1), and one Sb(5) atom. In the seventh O site, O(7) is bonded in a distorted tetrahedral geometry to one Dy(1), one Dy(2), one Sb(3), and one Sb(4) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Dy(2), one Dy(3), one Sb(2), and one Sb(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one Dy(2), one Dy(3), and one Sb(5) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(3), one Sb(4), and one Sb(6) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Dy(2), one Dy(3), and one Sb(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to two equivalent Dy(3) and one Sb(6) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(3), and one Sb(7) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Dy(3), one Sb(1), and one Sb(7) atom.
MgDy6(Sb5O12)2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 3-coordinate geometry to one O(6) and two equivalent O(9) atoms. The Mg(1)-O(6) bond length is 2.16 Å. Both Mg(1)-O(9) bond lengths are 2.09 Å. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(2), one O(3), one O(4), one O(6), and one O(7) atom. The Dy(1)-O(1) bond length is 2.79 Å. The Dy(1)-O(10) bond length is 2.54 Å. The Dy(1)-O(13) bond length is 2.29 Å. The Dy(1)-O(2) bond length is 2.33 Å. The Dy(1)-O(3) bond length is 2.25 Å. The Dy(1)-O(4) bond length is 2.27 Å. The Dy(1)-O(6) bond length is 2.62 Å. The Dy(1)-O(7) bond length is 2.46 Å. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(2), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. The Dy(2)-O(1) bond length is 2.63 Å. The Dy(2)-O(11) bond length is 2.25 Å. The Dy(2)-O(2) bond length is 2.35 Å. The Dy(2)-O(4) bond length is 2.30 Å. The Dy(2)-O(5) bond length is 2.36 Å. The Dy(2)-O(7) bond length is 2.42 Å. The Dy(2)-O(8) bond length is 2.75 Å. The Dy(2)-O(9) bond length is 2.47 Å. In the third Dy site, Dy(3) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(14), one O(5), one O(8), and one O(9) atom. The Dy(3)-O(10) bond length is 2.92 Å. The Dy(3)-O(11) bond length is 2.21 Å. The Dy(3)-O(12) bond length is 2.28 Å. The Dy(3)-O(13) bond length is 2.32 Å. The Dy(3)-O(14) bond length is 2.56 Å. The Dy(3)-O(5) bond length is 2.30 Å. The Dy(3)-O(8) bond length is 2.63 Å. The Dy(3)-O(9) bond length is 2.42 Å. There are seven inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 3-coordinate geometry to one O(14) and two equivalent O(1) atoms. The Sb(1)-O(14) bond length is 2.10 Å. Both Sb(1)-O(1) bond lengths are 2.02 Å. In the second Sb site, Sb(2) is bonded in a 4-coordinate geometry to one O(1), one O(11), one O(4), and one O(8) atom. The Sb(2)-O(1) bond length is 2.24 Å. The Sb(2)-O(11) bond length is 1.98 Å. The Sb(2)-O(4) bond length is 1.99 Å. The Sb(2)-O(8) bond length is 2.21 Å. In the third Sb site, Sb(3) is bonded in a 3-coordinate geometry to one O(2), one O(5), and one O(7) atom. The Sb(3)-O(2) bond length is 2.00 Å. The Sb(3)-O(5) bond length is 2.00 Å. The Sb(3)-O(7) bond length is 2.24 Å. In the fourth Sb site, Sb(4) is bonded in a 3-coordinate geometry to one O(10), one O(7), and one O(8) atom. The Sb(4)-O(10) bond length is 2.02 Å. The Sb(4)-O(7) bond length is 2.06 Å. The Sb(4)-O(8) bond length is 2.04 Å. In the fifth Sb site, Sb(5) is bonded in a 3-coordinate geometry to one O(6), two equivalent O(4), and two equivalent O(9) atoms. The Sb(5)-O(6) bond length is 2.06 Å. Both Sb(5)-O(4) bond lengths are 2.60 Å. Both Sb(5)-O(9) bond lengths are 2.06 Å. In the sixth Sb site, Sb(6) is bonded in a 4-coordinate geometry to one O(12), one O(3), and two equivalent O(10) atoms. The Sb(6)-O(12) bond length is 1.98 Å. The Sb(6)-O(3) bond length is 2.00 Å. Both Sb(6)-O(10) bond lengths are 2.23 Å. In the seventh Sb site, Sb(7) is bonded in a 3-coordinate geometry to one O(14) and two equivalent O(13) atoms. The Sb(7)-O(14) bond length is 2.08 Å. Both Sb(7)-O(13) bond lengths are 1.97 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(2), one Sb(1), and one Sb(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Dy(1), one Dy(2), and one Sb(3) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Dy(1) and one Sb(6) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(2), one Sb(2), and one Sb(5) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Dy(2), one Dy(3), and one Sb(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), two equivalent Dy(1), and one Sb(5) atom. In the seventh O site, O(7) is bonded in a distorted tetrahedral geometry to one Dy(1), one Dy(2), one Sb(3), and one Sb(4) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Dy(2), one Dy(3), one Sb(2), and one Sb(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one Dy(2), one Dy(3), and one Sb(5) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Dy(1), one Dy(3), one Sb(4), and one Sb(6) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Dy(2), one Dy(3), and one Sb(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to two equivalent Dy(3) and one Sb(6) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Dy(1), one Dy(3), and one Sb(7) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Dy(3), one Sb(1), and one Sb(7) atom.