Pr2NiCuAl2 crystallizes in the monoclinic Pm space group. There are six inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(3), two equivalent Cu(3), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(6) atoms. In the second Pr site, Pr(2) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. In the third Pr site, Pr(3) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Ni(3), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(5) atoms. In the fourth Pr site, Pr(4) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Cu(1), two equivalent Cu(3), two equivalent Al(1), two equivalent Al(4), and two equivalent Al(6) atoms. In the fifth Pr site, Pr(5) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(3), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(5) atoms. In the sixth Pr site, Pr(6) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Cu(1), two equivalent Cu(3), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(6) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted q6 geometry to one Pr(2), one Pr(3), one Pr(6), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. In the second Ni site, Ni(2) is bonded in a distorted q6 geometry to one Pr(1), one Pr(4), one Pr(5), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(6) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(3), two equivalent Pr(5), one Al(1), one Al(3), and one Al(5) atom. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(4), two equivalent Pr(6), one Al(2), one Al(4), and one Al(6) atom. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(5), one Al(2), one Al(3), and one Al(5) atom. In the third Cu site, Cu(3) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(6), one Al(1), one Al(4), and one Al(6) atom. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(5), one Ni(3), two equivalent Ni(2), one Cu(3), one Al(3), and one Al(6) atom to form distorted AlPr6Al2CuNi3 cuboctahedra that share corners with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(5)Pr6Al2CuNi3 cuboctahedra, and faces with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra. In the second Al site, Al(2) is bonded to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(6), two equivalent Ni(1), one Cu(1), one Cu(2), one Al(4), and one Al(5) atom to form distorted AlPr6Al2Cu2Ni2 cuboctahedra that share corners with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, faces with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Pr(3), two equivalent Pr(5), one Ni(3), two equivalent Ni(2), one Cu(2), one Al(1), and one Al(6) atom. In the fourth Al site, Al(4) is bonded to two equivalent Pr(2), two equivalent Pr(4), two equivalent Pr(6), two equivalent Ni(1), one Cu(1), one Cu(3), one Al(2), and one Al(5) atom to form distorted AlPr6Al2Cu2Ni2 cuboctahedra that share corners with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(1)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(5)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra. In the fifth Al site, Al(5) is bonded to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(5), one Ni(3), two equivalent Ni(1), one Cu(2), one Al(2), and one Al(4) atom to form distorted AlPr6Al2CuNi3 cuboctahedra that share corners with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(1)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra. In the sixth Al site, Al(6) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(6), two equivalent Ni(2), one Cu(1), one Cu(3), one Al(1), and one Al(3) atom.
Pr2NiCuAl2 crystallizes in the monoclinic Pm space group. There are six inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(3), two equivalent Cu(3), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(6) atoms. The Pr(1)-Ni(2) bond length is 2.99 Å. Both Pr(1)-Ni(3) bond lengths are 2.97 Å. Both Pr(1)-Cu(3) bond lengths are 3.01 Å. Both Pr(1)-Al(1) bond lengths are 3.34 Å. Both Pr(1)-Al(3) bond lengths are 3.30 Å. Both Pr(1)-Al(6) bond lengths are 3.35 Å. In the second Pr site, Pr(2) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. The Pr(2)-Ni(1) bond length is 2.96 Å. Both Pr(2)-Cu(1) bond lengths are 3.01 Å. Both Pr(2)-Cu(2) bond lengths are 3.00 Å. Both Pr(2)-Al(2) bond lengths are 3.37 Å. Both Pr(2)-Al(4) bond lengths are 3.31 Å. Both Pr(2)-Al(5) bond lengths are 3.32 Å. In the third Pr site, Pr(3) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Ni(3), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(5) atoms. The Pr(3)-Ni(1) bond length is 2.92 Å. Both Pr(3)-Ni(3) bond lengths are 2.96 Å. Both Pr(3)-Cu(2) bond lengths are 3.04 Å. Both Pr(3)-Al(2) bond lengths are 3.31 Å. Both Pr(3)-Al(3) bond lengths are 3.30 Å. Both Pr(3)-Al(5) bond lengths are 3.29 Å. In the fourth Pr site, Pr(4) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Cu(1), two equivalent Cu(3), two equivalent Al(1), two equivalent Al(4), and two equivalent Al(6) atoms. The Pr(4)-Ni(2) bond length is 2.91 Å. Both Pr(4)-Cu(1) bond lengths are 3.02 Å. Both Pr(4)-Cu(3) bond lengths are 3.02 Å. Both Pr(4)-Al(1) bond lengths are 3.30 Å. Both Pr(4)-Al(4) bond lengths are 3.32 Å. Both Pr(4)-Al(6) bond lengths are 3.34 Å. In the fifth Pr site, Pr(5) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(3), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(5) atoms. The Pr(5)-Ni(2) bond length is 2.92 Å. Both Pr(5)-Ni(3) bond lengths are 2.97 Å. Both Pr(5)-Cu(2) bond lengths are 3.04 Å. Both Pr(5)-Al(1) bond lengths are 3.25 Å. Both Pr(5)-Al(3) bond lengths are 3.37 Å. Both Pr(5)-Al(5) bond lengths are 3.29 Å. In the sixth Pr site, Pr(6) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Cu(1), two equivalent Cu(3), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(6) atoms. The Pr(6)-Ni(1) bond length is 2.91 Å. Both Pr(6)-Cu(1) bond lengths are 3.02 Å. Both Pr(6)-Cu(3) bond lengths are 3.01 Å. Both Pr(6)-Al(2) bond lengths are 3.29 Å. Both Pr(6)-Al(4) bond lengths are 3.32 Å. Both Pr(6)-Al(6) bond lengths are 3.32 Å. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted q6 geometry to one Pr(2), one Pr(3), one Pr(6), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. Both Ni(1)-Al(2) bond lengths are 2.65 Å. Both Ni(1)-Al(4) bond lengths are 2.63 Å. Both Ni(1)-Al(5) bond lengths are 2.65 Å. In the second Ni site, Ni(2) is bonded in a distorted q6 geometry to one Pr(1), one Pr(4), one Pr(5), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(6) atoms. Both Ni(2)-Al(1) bond lengths are 2.66 Å. Both Ni(2)-Al(3) bond lengths are 2.65 Å. Both Ni(2)-Al(6) bond lengths are 2.63 Å. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(3), two equivalent Pr(5), one Al(1), one Al(3), and one Al(5) atom. The Ni(3)-Al(1) bond length is 2.80 Å. The Ni(3)-Al(3) bond length is 2.87 Å. The Ni(3)-Al(5) bond length is 2.75 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(4), two equivalent Pr(6), one Al(2), one Al(4), and one Al(6) atom. The Cu(1)-Al(2) bond length is 2.83 Å. The Cu(1)-Al(4) bond length is 2.88 Å. The Cu(1)-Al(6) bond length is 2.80 Å. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(5), one Al(2), one Al(3), and one Al(5) atom. The Cu(2)-Al(2) bond length is 2.84 Å. The Cu(2)-Al(3) bond length is 2.76 Å. The Cu(2)-Al(5) bond length is 2.90 Å. In the third Cu site, Cu(3) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(6), one Al(1), one Al(4), and one Al(6) atom. The Cu(3)-Al(1) bond length is 2.84 Å. The Cu(3)-Al(4) bond length is 2.81 Å. The Cu(3)-Al(6) bond length is 2.86 Å. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(5), one Ni(3), two equivalent Ni(2), one Cu(3), one Al(3), and one Al(6) atom to form distorted AlPr6Al2CuNi3 cuboctahedra that share corners with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(5)Pr6Al2CuNi3 cuboctahedra, and faces with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra. The Al(1)-Al(3) bond length is 2.76 Å. The Al(1)-Al(6) bond length is 2.77 Å. In the second Al site, Al(2) is bonded to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(6), two equivalent Ni(1), one Cu(1), one Cu(2), one Al(4), and one Al(5) atom to form distorted AlPr6Al2Cu2Ni2 cuboctahedra that share corners with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, faces with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra. The Al(2)-Al(4) bond length is 2.75 Å. The Al(2)-Al(5) bond length is 2.74 Å. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Pr(3), two equivalent Pr(5), one Ni(3), two equivalent Ni(2), one Cu(2), one Al(1), and one Al(6) atom. The Al(3)-Al(6) bond length is 2.69 Å. In the fourth Al site, Al(4) is bonded to two equivalent Pr(2), two equivalent Pr(4), two equivalent Pr(6), two equivalent Ni(1), one Cu(1), one Cu(3), one Al(2), and one Al(5) atom to form distorted AlPr6Al2Cu2Ni2 cuboctahedra that share corners with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(1)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(5)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra. The Al(4)-Al(5) bond length is 2.71 Å. In the fifth Al site, Al(5) is bonded to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(5), one Ni(3), two equivalent Ni(1), one Cu(2), one Al(2), and one Al(4) atom to form distorted AlPr6Al2CuNi3 cuboctahedra that share corners with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(1)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra. In the sixth Al site, Al(6) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(6), two equivalent Ni(2), one Cu(1), one Cu(3), one Al(1), and one Al(3) atom.