PrCu6 is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 19-coordinate geometry to three equivalent Cu(1), three equivalent Cu(2), three equivalent Cu(4), three equivalent Cu(5), three equivalent Cu(6), and four equivalent Cu(3) atoms. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to three equivalent Pr(1), one Cu(3), one Cu(4), two equivalent Cu(2), and two equivalent Cu(6) atoms. In the second Cu site, Cu(2) is bonded to three equivalent Pr(1), one Cu(5), two equivalent Cu(1), two equivalent Cu(3), two equivalent Cu(4), and two equivalent Cu(6) atoms to form a mixture of corner, edge, and face-sharing CuPr3Cu9 cuboctahedra. In the third Cu site, Cu(3) is bonded in a 14-coordinate geometry to four equivalent Pr(1), one Cu(1), two equivalent Cu(2), two equivalent Cu(4), two equivalent Cu(6), and three equivalent Cu(5) atoms. In the fourth Cu site, Cu(4) is bonded to three equivalent Pr(1), one Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(5), and two equivalent Cu(6) atoms to form a mixture of distorted corner, edge, and face-sharing CuPr3Cu9 cuboctahedra. In the fifth Cu site, Cu(5) is bonded in a 8-coordinate geometry to three equivalent Pr(1), one Cu(2), one Cu(6), two equivalent Cu(4), and three equivalent Cu(3) atoms. In the sixth Cu site, Cu(6) is bonded to three equivalent Pr(1), one Cu(5), two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), and two equivalent Cu(4) atoms to form a mixture of corner, edge, and face-sharing CuPr3Cu9 cuboctahedra.
PrCu6 is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 19-coordinate geometry to three equivalent Cu(1), three equivalent Cu(2), three equivalent Cu(4), three equivalent Cu(5), three equivalent Cu(6), and four equivalent Cu(3) atoms. There are a spread of Pr(1)-Cu(1) bond distances ranging from 2.88-3.00 Å. There are a spread of Pr(1)-Cu(2) bond distances ranging from 3.14-3.26 Å. There are a spread of Pr(1)-Cu(4) bond distances ranging from 3.13-3.28 Å. There are a spread of Pr(1)-Cu(5) bond distances ranging from 2.89-2.95 Å. There are a spread of Pr(1)-Cu(6) bond distances ranging from 3.05-3.27 Å. There are a spread of Pr(1)-Cu(3) bond distances ranging from 3.09-3.36 Å. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to three equivalent Pr(1), one Cu(3), one Cu(4), two equivalent Cu(2), and two equivalent Cu(6) atoms. The Cu(1)-Cu(3) bond length is 2.57 Å. The Cu(1)-Cu(4) bond length is 2.49 Å. There is one shorter (2.43 Å) and one longer (2.54 Å) Cu(1)-Cu(2) bond length. There is one shorter (2.45 Å) and one longer (2.55 Å) Cu(1)-Cu(6) bond length. In the second Cu site, Cu(2) is bonded to three equivalent Pr(1), one Cu(5), two equivalent Cu(1), two equivalent Cu(3), two equivalent Cu(4), and two equivalent Cu(6) atoms to form a mixture of corner, edge, and face-sharing CuPr3Cu9 cuboctahedra. The Cu(2)-Cu(5) bond length is 2.44 Å. There is one shorter (2.66 Å) and one longer (2.67 Å) Cu(2)-Cu(3) bond length. There is one shorter (2.46 Å) and one longer (2.47 Å) Cu(2)-Cu(4) bond length. There is one shorter (2.50 Å) and one longer (2.58 Å) Cu(2)-Cu(6) bond length. In the third Cu site, Cu(3) is bonded in a 14-coordinate geometry to four equivalent Pr(1), one Cu(1), two equivalent Cu(2), two equivalent Cu(4), two equivalent Cu(6), and three equivalent Cu(5) atoms. There is one shorter (2.71 Å) and one longer (2.79 Å) Cu(3)-Cu(4) bond length. There is one shorter (2.64 Å) and one longer (2.75 Å) Cu(3)-Cu(6) bond length. There are a spread of Cu(3)-Cu(5) bond distances ranging from 2.52-3.27 Å. In the fourth Cu site, Cu(4) is bonded to three equivalent Pr(1), one Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(5), and two equivalent Cu(6) atoms to form a mixture of distorted corner, edge, and face-sharing CuPr3Cu9 cuboctahedra. There is one shorter (2.46 Å) and one longer (2.57 Å) Cu(4)-Cu(5) bond length. There is one shorter (2.43 Å) and one longer (2.47 Å) Cu(4)-Cu(6) bond length. In the fifth Cu site, Cu(5) is bonded in a 8-coordinate geometry to three equivalent Pr(1), one Cu(2), one Cu(6), two equivalent Cu(4), and three equivalent Cu(3) atoms. The Cu(5)-Cu(6) bond length is 2.52 Å. In the sixth Cu site, Cu(6) is bonded to three equivalent Pr(1), one Cu(5), two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), and two equivalent Cu(4) atoms to form a mixture of corner, edge, and face-sharing CuPr3Cu9 cuboctahedra.