PrCu9Cd2 crystallizes in the tetragonal P4/mbm space group. Pr(1) is bonded in a 20-coordinate geometry to eight equivalent Cu(1), eight equivalent Cu(2), and four equivalent Cd(1) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Pr(1), one Cu(3), two equivalent Cu(1), four equivalent Cu(2), and three equivalent Cd(1) atoms to form distorted CuPr2Cd3Cu7 cuboctahedra that share  a cornercorner with one Cu(3)Cd4Cu8 cuboctahedra, corners with six equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, corners with eleven equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, edges with four equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, edges with five equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, faces with three equivalent Cu(3)Cd4Cu8 cuboctahedra, faces with seven equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, and faces with ten equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Pr(1), one Cu(3), three equivalent Cu(2), four equivalent Cu(1), and two equivalent Cd(1) atoms to form distorted CuPr2Cd2Cu8 cuboctahedra that share corners with three equivalent Cu(3)Cd4Cu8 cuboctahedra, corners with six equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, corners with eleven equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, edges with two equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, edges with four equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, faces with two equivalent Cu(3)Cd4Cu8 cuboctahedra, faces with seven equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, and faces with ten equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra. In the third Cu site, Cu(3) is bonded to four equivalent Cu(1), four equivalent Cu(2), and four equivalent Cd(1) atoms to form CuCd4Cu8 cuboctahedra that share corners with four equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, corners with twelve equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, edges with two equivalent Cu(3)Cd4Cu8 cuboctahedra, faces with eight equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, and faces with twelve equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra. Cd(1) is bonded in a 15-coordinate geometry to two equivalent Pr(1), two equivalent Cu(3), four equivalent Cu(2), six equivalent Cu(1), and one Cd(1) atom.
PrCu9Cd2 crystallizes in the tetragonal P4/mbm space group. Pr(1) is bonded in a 20-coordinate geometry to eight equivalent Cu(1), eight equivalent Cu(2), and four equivalent Cd(1) atoms. All Pr(1)-Cu(1) bond lengths are 3.36 Å. All Pr(1)-Cu(2) bond lengths are 3.11 Å. All Pr(1)-Cd(1) bond lengths are 3.38 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Pr(1), one Cu(3), two equivalent Cu(1), four equivalent Cu(2), and three equivalent Cd(1) atoms to form distorted CuPr2Cd3Cu7 cuboctahedra that share  a cornercorner with one Cu(3)Cd4Cu8 cuboctahedra, corners with six equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, corners with eleven equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, edges with four equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, edges with five equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, faces with three equivalent Cu(3)Cd4Cu8 cuboctahedra, faces with seven equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, and faces with ten equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra. The Cu(1)-Cu(3) bond length is 2.49 Å. There is one shorter (2.48 Å) and one longer (2.52 Å) Cu(1)-Cu(1) bond length. There are two shorter (2.54 Å) and two longer (2.59 Å) Cu(1)-Cu(2) bond lengths. There is one shorter (2.72 Å) and two longer (2.86 Å) Cu(1)-Cd(1) bond lengths. In the second Cu site, Cu(2) is bonded to two equivalent Pr(1), one Cu(3), three equivalent Cu(2), four equivalent Cu(1), and two equivalent Cd(1) atoms to form distorted CuPr2Cd2Cu8 cuboctahedra that share corners with three equivalent Cu(3)Cd4Cu8 cuboctahedra, corners with six equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, corners with eleven equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, edges with two equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, edges with four equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, faces with two equivalent Cu(3)Cd4Cu8 cuboctahedra, faces with seven equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, and faces with ten equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra. The Cu(2)-Cu(3) bond length is 2.53 Å. There are two shorter (2.62 Å) and one longer (2.73 Å) Cu(2)-Cu(2) bond length. Both Cu(2)-Cd(1) bond lengths are 2.93 Å. In the third Cu site, Cu(3) is bonded to four equivalent Cu(1), four equivalent Cu(2), and four equivalent Cd(1) atoms to form CuCd4Cu8 cuboctahedra that share corners with four equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra, corners with twelve equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, edges with two equivalent Cu(3)Cd4Cu8 cuboctahedra, faces with eight equivalent Cu(2)Pr2Cd2Cu8 cuboctahedra, and faces with twelve equivalent Cu(1)Pr2Cd3Cu7 cuboctahedra. All Cu(3)-Cd(1) bond lengths are 2.88 Å. Cd(1) is bonded in a 15-coordinate geometry to two equivalent Pr(1), two equivalent Cu(3), four equivalent Cu(2), six equivalent Cu(1), and one Cd(1) atom. The Cd(1)-Cd(1) bond length is 2.88 Å.