Pr6Ni20P13 crystallizes in the hexagonal P-6 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to one Ni(1), one Ni(8), two equivalent Ni(2), two equivalent Ni(5), two equivalent Ni(6), two equivalent Ni(7), two equivalent P(2), and four equivalent P(1) atoms. In the second Pr site, Pr(2) is bonded in a 15-coordinate geometry to one Ni(6), two equivalent Ni(4), two equivalent Ni(5), two equivalent Ni(7), two equivalent Ni(8), two equivalent P(4), and four equivalent P(3) atoms. There are eight inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to one Pr(1), one P(4), one P(5), and two equivalent P(2) atoms. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to six equivalent Pr(1) and three equivalent P(1) atoms. In the third Ni site, Ni(3) is bonded in a 1-coordinate geometry to one P(2), two equivalent P(4), and two equivalent P(5) atoms. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to six equivalent Pr(2) and three equivalent P(3) atoms. In the fifth Ni site, Ni(5) is bonded to two equivalent Pr(1), two equivalent Pr(2), one P(3), one P(4), and two equivalent P(1) atoms to form distorted NiPr4P4 tetrahedra that share corners with two equivalent Ni(6)Pr3P4 tetrahedra, corners with two equivalent Ni(5)Pr4P4 tetrahedra, corners with four equivalent Ni(7)Pr4P4 tetrahedra, edges with two equivalent Ni(5)Pr4P4 tetrahedra, faces with two equivalent Ni(6)Pr3P4 tetrahedra, and faces with two equivalent Ni(7)Pr4P4 tetrahedra. In the sixth Ni site, Ni(6) is bonded to one Pr(2), two equivalent Pr(1), one P(1), one P(2), and two equivalent P(4) atoms to form distorted NiPr3P4 tetrahedra that share corners with two equivalent Ni(5)Pr4P4 tetrahedra, corners with three equivalent Ni(7)Pr4P4 tetrahedra,  an edgeedge with one Ni(7)Pr4P4 tetrahedra, edges with two equivalent Ni(6)Pr3P4 tetrahedra,  a faceface with one Ni(7)Pr4P4 tetrahedra, and faces with two equivalent Ni(5)Pr4P4 tetrahedra. In the seventh Ni site, Ni(7) is bonded to two equivalent Pr(1), two equivalent Pr(2), one P(1), one P(2), and two equivalent P(3) atoms to form distorted NiPr4P4 tetrahedra that share corners with two equivalent Ni(7)Pr4P4 tetrahedra, corners with three equivalent Ni(6)Pr3P4 tetrahedra, corners with four equivalent Ni(5)Pr4P4 tetrahedra,  an edgeedge with one Ni(6)Pr3P4 tetrahedra, edges with two equivalent Ni(7)Pr4P4 tetrahedra,  a faceface with one Ni(6)Pr3P4 tetrahedra, and faces with two equivalent Ni(5)Pr4P4 tetrahedra. In the eighth Ni site, Ni(8) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), one P(3), one P(4), and two equivalent P(2) atoms. There are five inequivalent P sites. In the first P site, P(3) is bonded in a 9-coordinate geometry to four equivalent Pr(2), one Ni(4), one Ni(5), one Ni(8), and two equivalent Ni(7) atoms. In the second P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(1), one Ni(5), one Ni(8), two equivalent Ni(3), and two equivalent Ni(6) atoms. In the third P site, P(5) is bonded in a 9-coordinate geometry to three equivalent Ni(1) and six equivalent Ni(3) atoms. In the fourth P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Pr(1), one Ni(2), one Ni(6), one Ni(7), and two equivalent Ni(5) atoms. In the fifth P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Pr(1), one Ni(3), one Ni(6), one Ni(7), two equivalent Ni(1), and two equivalent Ni(8) atoms.
Pr6Ni20P13 crystallizes in the hexagonal P-6 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to one Ni(1), one Ni(8), two equivalent Ni(2), two equivalent Ni(5), two equivalent Ni(6), two equivalent Ni(7), two equivalent P(2), and four equivalent P(1) atoms. The Pr(1)-Ni(1) bond length is 3.08 Å. The Pr(1)-Ni(8) bond length is 3.16 Å. Both Pr(1)-Ni(2) bond lengths are 2.99 Å. There is one shorter (3.10 Å) and one longer (3.12 Å) Pr(1)-Ni(5) bond length. Both Pr(1)-Ni(6) bond lengths are 3.10 Å. Both Pr(1)-Ni(7) bond lengths are 3.07 Å. Both Pr(1)-P(2) bond lengths are 2.97 Å. There are two shorter (2.99 Å) and two longer (3.02 Å) Pr(1)-P(1) bond lengths. In the second Pr site, Pr(2) is bonded in a 15-coordinate geometry to one Ni(6), two equivalent Ni(4), two equivalent Ni(5), two equivalent Ni(7), two equivalent Ni(8), two equivalent P(4), and four equivalent P(3) atoms. The Pr(2)-Ni(6) bond length is 3.08 Å. Both Pr(2)-Ni(4) bond lengths are 3.00 Å. Both Pr(2)-Ni(5) bond lengths are 3.07 Å. There is one shorter (3.07 Å) and one longer (3.15 Å) Pr(2)-Ni(7) bond length. Both Pr(2)-Ni(8) bond lengths are 3.02 Å. Both Pr(2)-P(4) bond lengths are 2.91 Å. There are two shorter (2.99 Å) and two longer (3.01 Å) Pr(2)-P(3) bond lengths. There are eight inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to one Pr(1), one P(4), one P(5), and two equivalent P(2) atoms. The Ni(1)-P(4) bond length is 2.19 Å. The Ni(1)-P(5) bond length is 2.12 Å. Both Ni(1)-P(2) bond lengths are 2.38 Å. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to six equivalent Pr(1) and three equivalent P(1) atoms. All Ni(2)-P(1) bond lengths are 2.32 Å. In the third Ni site, Ni(3) is bonded in a 1-coordinate geometry to one P(2), two equivalent P(4), and two equivalent P(5) atoms. The Ni(3)-P(2) bond length is 2.23 Å. Both Ni(3)-P(4) bond lengths are 2.71 Å. Both Ni(3)-P(5) bond lengths are 2.48 Å. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to six equivalent Pr(2) and three equivalent P(3) atoms. All Ni(4)-P(3) bond lengths are 2.31 Å. In the fifth Ni site, Ni(5) is bonded to two equivalent Pr(1), two equivalent Pr(2), one P(3), one P(4), and two equivalent P(1) atoms to form distorted NiPr4P4 tetrahedra that share corners with two equivalent Ni(6)Pr3P4 tetrahedra, corners with two equivalent Ni(5)Pr4P4 tetrahedra, corners with four equivalent Ni(7)Pr4P4 tetrahedra, edges with two equivalent Ni(5)Pr4P4 tetrahedra, faces with two equivalent Ni(6)Pr3P4 tetrahedra, and faces with two equivalent Ni(7)Pr4P4 tetrahedra. The Ni(5)-P(3) bond length is 2.32 Å. The Ni(5)-P(4) bond length is 2.27 Å. Both Ni(5)-P(1) bond lengths are 2.28 Å. In the sixth Ni site, Ni(6) is bonded to one Pr(2), two equivalent Pr(1), one P(1), one P(2), and two equivalent P(4) atoms to form distorted NiPr3P4 tetrahedra that share corners with two equivalent Ni(5)Pr4P4 tetrahedra, corners with three equivalent Ni(7)Pr4P4 tetrahedra,  an edgeedge with one Ni(7)Pr4P4 tetrahedra, edges with two equivalent Ni(6)Pr3P4 tetrahedra,  a faceface with one Ni(7)Pr4P4 tetrahedra, and faces with two equivalent Ni(5)Pr4P4 tetrahedra. The Ni(6)-P(1) bond length is 2.37 Å. The Ni(6)-P(2) bond length is 2.35 Å. Both Ni(6)-P(4) bond lengths are 2.28 Å. In the seventh Ni site, Ni(7) is bonded to two equivalent Pr(1), two equivalent Pr(2), one P(1), one P(2), and two equivalent P(3) atoms to form distorted NiPr4P4 tetrahedra that share corners with two equivalent Ni(7)Pr4P4 tetrahedra, corners with three equivalent Ni(6)Pr3P4 tetrahedra, corners with four equivalent Ni(5)Pr4P4 tetrahedra,  an edgeedge with one Ni(6)Pr3P4 tetrahedra, edges with two equivalent Ni(7)Pr4P4 tetrahedra,  a faceface with one Ni(6)Pr3P4 tetrahedra, and faces with two equivalent Ni(5)Pr4P4 tetrahedra. The Ni(7)-P(1) bond length is 2.37 Å. The Ni(7)-P(2) bond length is 2.28 Å. Both Ni(7)-P(3) bond lengths are 2.29 Å. In the eighth Ni site, Ni(8) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), one P(3), one P(4), and two equivalent P(2) atoms. The Ni(8)-P(3) bond length is 2.30 Å. The Ni(8)-P(4) bond length is 2.32 Å. Both Ni(8)-P(2) bond lengths are 2.34 Å. There are five inequivalent P sites. In the first P site, P(3) is bonded in a 9-coordinate geometry to four equivalent Pr(2), one Ni(4), one Ni(5), one Ni(8), and two equivalent Ni(7) atoms. In the second P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(1), one Ni(5), one Ni(8), two equivalent Ni(3), and two equivalent Ni(6) atoms. In the third P site, P(5) is bonded in a 9-coordinate geometry to three equivalent Ni(1) and six equivalent Ni(3) atoms. In the fourth P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Pr(1), one Ni(2), one Ni(6), one Ni(7), and two equivalent Ni(5) atoms. In the fifth P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Pr(1), one Ni(3), one Ni(6), one Ni(7), two equivalent Ni(1), and two equivalent Ni(8) atoms.