Pr(CuAl2)4 crystallizes in the monoclinic C2/m space group. Pr(1) is bonded in a 20-coordinate geometry to four equivalent Cu(1), four equivalent Cu(2), two equivalent Al(3), two equivalent Al(4), four equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Pr(1), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(4) atoms to form a mixture of distorted corner, edge, and face-sharing CuPr2Al8Cu2 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Pr(1), two equivalent Cu(1), two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(4) atoms to form a mixture of distorted corner, edge, and face-sharing CuPr2Al8Cu2 cuboctahedra. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(4) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(4) atoms. In the third Al site, Al(3) is bonded in a 10-coordinate geometry to one Pr(1), two equivalent Cu(1), two equivalent Cu(2), one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. In the fourth Al site, Al(4) is bonded in a 10-coordinate geometry to one Pr(1), two equivalent Cu(1), two equivalent Cu(2), one Al(4), two equivalent Al(1), and two equivalent Al(2) atoms.
Pr(CuAl2)4 crystallizes in the monoclinic C2/m space group. Pr(1) is bonded in a 20-coordinate geometry to four equivalent Cu(1), four equivalent Cu(2), two equivalent Al(3), two equivalent Al(4), four equivalent Al(1), and four equivalent Al(2) atoms. All Pr(1)-Cu(1) bond lengths are 3.37 Å. All Pr(1)-Cu(2) bond lengths are 3.36 Å. Both Pr(1)-Al(3) bond lengths are 3.08 Å. Both Pr(1)-Al(4) bond lengths are 3.08 Å. All Pr(1)-Al(1) bond lengths are 3.22 Å. There are two shorter (3.22 Å) and two longer (3.23 Å) Pr(1)-Al(2) bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Pr(1), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(4) atoms to form a mixture of distorted corner, edge, and face-sharing CuPr2Al8Cu2 cuboctahedra. Both Cu(1)-Cu(2) bond lengths are 2.57 Å. Both Cu(1)-Al(1) bond lengths are 2.56 Å. Both Cu(1)-Al(2) bond lengths are 2.56 Å. Both Cu(1)-Al(3) bond lengths are 2.70 Å. Both Cu(1)-Al(4) bond lengths are 2.69 Å. In the second Cu site, Cu(2) is bonded to two equivalent Pr(1), two equivalent Cu(1), two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(4) atoms to form a mixture of distorted corner, edge, and face-sharing CuPr2Al8Cu2 cuboctahedra. Both Cu(2)-Al(1) bond lengths are 2.56 Å. Both Cu(2)-Al(2) bond lengths are 2.56 Å. Both Cu(2)-Al(3) bond lengths are 2.69 Å. Both Cu(2)-Al(4) bond lengths are 2.69 Å. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(4) atoms. Both Al(1)-Al(2) bond lengths are 2.76 Å. Both Al(1)-Al(3) bond lengths are 2.80 Å. Both Al(1)-Al(4) bond lengths are 2.78 Å. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(4) atoms. Both Al(2)-Al(3) bond lengths are 2.78 Å. Both Al(2)-Al(4) bond lengths are 2.80 Å. In the third Al site, Al(3) is bonded in a 10-coordinate geometry to one Pr(1), two equivalent Cu(1), two equivalent Cu(2), one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. The Al(3)-Al(3) bond length is 2.64 Å. In the fourth Al site, Al(4) is bonded in a 10-coordinate geometry to one Pr(1), two equivalent Cu(1), two equivalent Cu(2), one Al(4), two equivalent Al(1), and two equivalent Al(2) atoms. The Al(4)-Al(4) bond length is 2.65 Å.