Pr2Zn17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 18-coordinate geometry to six equivalent Zn(2) and twelve equivalent Zn(1) atoms. In the second Pr site, Pr(2) is bonded in a 20-coordinate geometry to two equivalent Zn(4), six equivalent Zn(1), six equivalent Zn(2), and six equivalent Zn(3) atoms. There are four inequivalent Zn sites. In the first Zn site, Zn(4) is bonded in a 14-coordinate geometry to one Pr(2), one Zn(4), three equivalent Zn(1), three equivalent Zn(3), and six equivalent Zn(2) atoms. In the second Zn site, Zn(1) is bonded to one Pr(2), two equivalent Pr(1), one Zn(4), two equivalent Zn(1), two equivalent Zn(3), and four equivalent Zn(2) atoms to form distorted ZnPr3Zn9 cuboctahedra that share corners with five equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(2)Pr2Zn10 cuboctahedra, corners with ten equivalent Zn(1)Pr3Zn9 cuboctahedra, edges with two equivalent Zn(2)Pr2Zn10 cuboctahedra, edges with three equivalent Zn(3)Pr2Zn10 cuboctahedra, edges with five equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with two equivalent Zn(3)Pr2Zn10 cuboctahedra, faces with eight equivalent Zn(1)Pr3Zn9 cuboctahedra, and faces with ten equivalent Zn(2)Pr2Zn10 cuboctahedra. In the third Zn site, Zn(2) is bonded to one Pr(1), one Pr(2), two equivalent Zn(2), two equivalent Zn(3), two equivalent Zn(4), and four equivalent Zn(1) atoms to form distorted ZnPr2Zn10 cuboctahedra that share corners with four equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(1)Pr3Zn9 cuboctahedra, corners with twelve equivalent Zn(2)Pr2Zn10 cuboctahedra,  an edgeedge with one Zn(2)Pr2Zn10 cuboctahedra, edges with two equivalent Zn(3)Pr2Zn10 cuboctahedra, edges with two equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with four equivalent Zn(3)Pr2Zn10 cuboctahedra, faces with seven equivalent Zn(2)Pr2Zn10 cuboctahedra, and faces with ten equivalent Zn(1)Pr3Zn9 cuboctahedra. In the fourth Zn site, Zn(3) is bonded to two equivalent Pr(2), two equivalent Zn(4), four equivalent Zn(1), and four equivalent Zn(2) atoms to form ZnPr2Zn10 cuboctahedra that share corners with four equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(2)Pr2Zn10 cuboctahedra, corners with ten equivalent Zn(1)Pr3Zn9 cuboctahedra, edges with four equivalent Zn(2)Pr2Zn10 cuboctahedra, edges with six equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with four equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with six equivalent Zn(3)Pr2Zn10 cuboctahedra, and faces with eight equivalent Zn(2)Pr2Zn10 cuboctahedra.
Pr2Zn17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 18-coordinate geometry to six equivalent Zn(2) and twelve equivalent Zn(1) atoms. All Pr(1)-Zn(2) bond lengths are 3.18 Å. There are six shorter (3.24 Å) and six longer (3.44 Å) Pr(1)-Zn(1) bond lengths. In the second Pr site, Pr(2) is bonded in a 20-coordinate geometry to two equivalent Zn(4), six equivalent Zn(1), six equivalent Zn(2), and six equivalent Zn(3) atoms. Both Pr(2)-Zn(4) bond lengths are 3.10 Å. All Pr(2)-Zn(1) bond lengths are 3.35 Å. All Pr(2)-Zn(2) bond lengths are 3.22 Å. All Pr(2)-Zn(3) bond lengths are 3.39 Å. There are four inequivalent Zn sites. In the first Zn site, Zn(4) is bonded in a 14-coordinate geometry to one Pr(2), one Zn(4), three equivalent Zn(1), three equivalent Zn(3), and six equivalent Zn(2) atoms. The Zn(4)-Zn(4) bond length is 2.56 Å. All Zn(4)-Zn(1) bond lengths are 2.86 Å. All Zn(4)-Zn(3) bond lengths are 2.74 Å. All Zn(4)-Zn(2) bond lengths are 2.90 Å. In the second Zn site, Zn(1) is bonded to one Pr(2), two equivalent Pr(1), one Zn(4), two equivalent Zn(1), two equivalent Zn(3), and four equivalent Zn(2) atoms to form distorted ZnPr3Zn9 cuboctahedra that share corners with five equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(2)Pr2Zn10 cuboctahedra, corners with ten equivalent Zn(1)Pr3Zn9 cuboctahedra, edges with two equivalent Zn(2)Pr2Zn10 cuboctahedra, edges with three equivalent Zn(3)Pr2Zn10 cuboctahedra, edges with five equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with two equivalent Zn(3)Pr2Zn10 cuboctahedra, faces with eight equivalent Zn(1)Pr3Zn9 cuboctahedra, and faces with ten equivalent Zn(2)Pr2Zn10 cuboctahedra. Both Zn(1)-Zn(1) bond lengths are 2.54 Å. Both Zn(1)-Zn(3) bond lengths are 2.62 Å. There are two shorter (2.70 Å) and two longer (2.77 Å) Zn(1)-Zn(2) bond lengths. In the third Zn site, Zn(2) is bonded to one Pr(1), one Pr(2), two equivalent Zn(2), two equivalent Zn(3), two equivalent Zn(4), and four equivalent Zn(1) atoms to form distorted ZnPr2Zn10 cuboctahedra that share corners with four equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(1)Pr3Zn9 cuboctahedra, corners with twelve equivalent Zn(2)Pr2Zn10 cuboctahedra,  an edgeedge with one Zn(2)Pr2Zn10 cuboctahedra, edges with two equivalent Zn(3)Pr2Zn10 cuboctahedra, edges with two equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with four equivalent Zn(3)Pr2Zn10 cuboctahedra, faces with seven equivalent Zn(2)Pr2Zn10 cuboctahedra, and faces with ten equivalent Zn(1)Pr3Zn9 cuboctahedra. There is one shorter (2.56 Å) and one longer (2.65 Å) Zn(2)-Zn(2) bond length. Both Zn(2)-Zn(3) bond lengths are 2.58 Å. In the fourth Zn site, Zn(3) is bonded to two equivalent Pr(2), two equivalent Zn(4), four equivalent Zn(1), and four equivalent Zn(2) atoms to form ZnPr2Zn10 cuboctahedra that share corners with four equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(2)Pr2Zn10 cuboctahedra, corners with ten equivalent Zn(1)Pr3Zn9 cuboctahedra, edges with four equivalent Zn(2)Pr2Zn10 cuboctahedra, edges with six equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with four equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with six equivalent Zn(3)Pr2Zn10 cuboctahedra, and faces with eight equivalent Zn(2)Pr2Zn10 cuboctahedra.