Dy(CuAl2)4 crystallizes in the monoclinic C2/m space group. Dy(1) is bonded in a 20-coordinate geometry to two equivalent Cu(2), two equivalent Cu(3), four equivalent Cu(1), four equivalent Al(2), and eight equivalent Al(1) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Dy(1), two equivalent Cu(1), four equivalent Al(1), and four equivalent Al(2) atoms. In the second Cu site, Cu(2) is bonded in a 12-coordinate geometry to two equivalent Dy(1), two equivalent Cu(3), four equivalent Al(1), and four equivalent Al(2) atoms. In the third Cu site, Cu(3) is bonded to two equivalent Dy(1), two equivalent Cu(2), four equivalent Al(1), and four equivalent Al(2) atoms to form distorted corner-sharing CuDy2Al8Cu2 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Dy(1), one Cu(2), one Cu(3), two equivalent Cu(1), two equivalent Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Dy(1), one Cu(2), one Cu(3), two equivalent Cu(1), one Al(2), and four equivalent Al(1) atoms.
Dy(CuAl2)4 crystallizes in the monoclinic C2/m space group. Dy(1) is bonded in a 20-coordinate geometry to two equivalent Cu(2), two equivalent Cu(3), four equivalent Cu(1), four equivalent Al(2), and eight equivalent Al(1) atoms. Both Dy(1)-Cu(2) bond lengths are 3.34 Å. Both Dy(1)-Cu(3) bond lengths are 3.33 Å. All Dy(1)-Cu(1) bond lengths are 3.34 Å. All Dy(1)-Al(2) bond lengths are 3.04 Å. All Dy(1)-Al(1) bond lengths are 3.18 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Dy(1), two equivalent Cu(1), four equivalent Al(1), and four equivalent Al(2) atoms. Both Cu(1)-Cu(1) bond lengths are 2.55 Å. All Cu(1)-Al(1) bond lengths are 2.54 Å. There are two shorter (2.66 Å) and two longer (2.67 Å) Cu(1)-Al(2) bond lengths. In the second Cu site, Cu(2) is bonded in a 12-coordinate geometry to two equivalent Dy(1), two equivalent Cu(3), four equivalent Al(1), and four equivalent Al(2) atoms. Both Cu(2)-Cu(3) bond lengths are 2.55 Å. All Cu(2)-Al(1) bond lengths are 2.54 Å. All Cu(2)-Al(2) bond lengths are 2.67 Å. In the third Cu site, Cu(3) is bonded to two equivalent Dy(1), two equivalent Cu(2), four equivalent Al(1), and four equivalent Al(2) atoms to form distorted corner-sharing CuDy2Al8Cu2 cuboctahedra. All Cu(3)-Al(1) bond lengths are 2.54 Å. All Cu(3)-Al(2) bond lengths are 2.67 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Dy(1), one Cu(2), one Cu(3), two equivalent Cu(1), two equivalent Al(1), and four equivalent Al(2) atoms. Both Al(1)-Al(1) bond lengths are 2.70 Å. There is one shorter (2.78 Å) and three longer (2.79 Å) Al(1)-Al(2) bond lengths. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Dy(1), one Cu(2), one Cu(3), two equivalent Cu(1), one Al(2), and four equivalent Al(1) atoms. The Al(2)-Al(2) bond length is 2.65 Å.