Yb5Ni19P12 crystallizes in the monoclinic C2/m space group. There are three inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 16-coordinate geometry to two equivalent Ni(6), four equivalent Ni(7), four equivalent Ni(8), two equivalent P(3), and four equivalent P(5) atoms. In the second Yb site, Yb(2) is bonded in a 16-coordinate geometry to one Ni(5), one Ni(9), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(6), two equivalent Ni(7), two equivalent P(2), two equivalent P(5), and two equivalent P(6) atoms. In the third Yb site, Yb(3) is bonded in a 8-coordinate geometry to two equivalent Ni(9), two equivalent P(1), two equivalent P(3), and two equivalent P(4) atoms. There are ten inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to four equivalent Yb(2), four equivalent Ni(6), two equivalent P(5), and two equivalent P(6) atoms. In the second Ni site, Ni(2) is bonded to one P(2) and three equivalent P(1) atoms to form distorted NiP4 tetrahedra that share  a cornercorner with one Ni(5)YbP4 tetrahedra, corners with two equivalent Ni(2)P4 tetrahedra, corners with three equivalent Ni(4)P4 tetrahedra, edges with two equivalent Ni(2)P4 tetrahedra, and edges with two equivalent Ni(5)YbP4 tetrahedra. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to two equivalent Yb(2), one P(2), one P(6), and two equivalent P(4) atoms. In the fourth Ni site, Ni(4) is bonded to one P(1) and three equivalent P(4) atoms to form distorted NiP4 tetrahedra that share  a cornercorner with one Ni(5)YbP4 tetrahedra, corners with two equivalent Ni(4)P4 tetrahedra, corners with three equivalent Ni(2)P4 tetrahedra, and edges with two equivalent Ni(4)P4 tetrahedra. In the fifth Ni site, Ni(5) is bonded to one Yb(2), one P(1), one P(3), and two equivalent P(2) atoms to form distorted NiYbP4 tetrahedra that share  a cornercorner with one Ni(2)P4 tetrahedra,  a cornercorner with one Ni(4)P4 tetrahedra, corners with two equivalent Ni(5)YbP4 tetrahedra, and edges with two equivalent Ni(2)P4 tetrahedra. In the sixth Ni site, Ni(6) is bonded in a 12-coordinate geometry to one Yb(1), two equivalent Yb(2), one Ni(9), two equivalent Ni(1), two equivalent Ni(8), two equivalent P(5), and two equivalent P(6) atoms. In the seventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to two equivalent Yb(1), two equivalent Yb(2), one P(2), one P(5), and two equivalent P(3) atoms. In the eighth Ni site, Ni(8) is bonded in a 4-coordinate geometry to two equivalent Yb(1), two equivalent Ni(6), one P(5), one P(6), and two equivalent P(3) atoms. In the ninth Ni site, Ni(9) is bonded in a 6-coordinate geometry to one Yb(2), two equivalent Yb(3), one Ni(6), one P(3), one P(4), and two equivalent P(6) atoms. In the tenth Ni site, Ni(10) is bonded in a 5-coordinate geometry to one P(4), two equivalent P(1), and two equivalent P(2) atoms. There are six inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Yb(3), one Ni(4), one Ni(5), two equivalent Ni(10), and three equivalent Ni(2) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Yb(2), one Ni(2), one Ni(3), one Ni(7), two equivalent Ni(10), and two equivalent Ni(5) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to one Yb(1), two equivalent Yb(3), one Ni(5), one Ni(9), two equivalent Ni(7), and two equivalent Ni(8) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Yb(3), one Ni(10), one Ni(9), two equivalent Ni(3), and three equivalent Ni(4) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Yb(1), two equivalent Yb(2), one Ni(1), one Ni(7), one Ni(8), and two equivalent Ni(6) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Yb(2), one Ni(1), one Ni(3), one Ni(8), two equivalent Ni(6), and two equivalent Ni(9) atoms.
Yb5Ni19P12 crystallizes in the monoclinic C2/m space group. There are three inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 16-coordinate geometry to two equivalent Ni(6), four equivalent Ni(7), four equivalent Ni(8), two equivalent P(3), and four equivalent P(5) atoms. Both Yb(1)-Ni(6) bond lengths are 2.98 Å. All Yb(1)-Ni(7) bond lengths are 3.21 Å. All Yb(1)-Ni(8) bond lengths are 2.93 Å. Both Yb(1)-P(3) bond lengths are 2.82 Å. All Yb(1)-P(5) bond lengths are 2.89 Å. In the second Yb site, Yb(2) is bonded in a 16-coordinate geometry to one Ni(5), one Ni(9), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(6), two equivalent Ni(7), two equivalent P(2), two equivalent P(5), and two equivalent P(6) atoms. The Yb(2)-Ni(5) bond length is 3.11 Å. The Yb(2)-Ni(9) bond length is 3.15 Å. Both Yb(2)-Ni(1) bond lengths are 3.07 Å. Both Yb(2)-Ni(3) bond lengths are 3.02 Å. There is one shorter (2.93 Å) and one longer (3.16 Å) Yb(2)-Ni(6) bond length. Both Yb(2)-Ni(7) bond lengths are 3.00 Å. Both Yb(2)-P(2) bond lengths are 2.85 Å. Both Yb(2)-P(5) bond lengths are 2.82 Å. Both Yb(2)-P(6) bond lengths are 2.81 Å. In the third Yb site, Yb(3) is bonded in a 8-coordinate geometry to two equivalent Ni(9), two equivalent P(1), two equivalent P(3), and two equivalent P(4) atoms. Both Yb(3)-Ni(9) bond lengths are 2.86 Å. Both Yb(3)-P(1) bond lengths are 2.81 Å. Both Yb(3)-P(3) bond lengths are 2.88 Å. Both Yb(3)-P(4) bond lengths are 2.88 Å. There are ten inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to four equivalent Yb(2), four equivalent Ni(6), two equivalent P(5), and two equivalent P(6) atoms. All Ni(1)-Ni(6) bond lengths are 2.58 Å. Both Ni(1)-P(5) bond lengths are 2.40 Å. Both Ni(1)-P(6) bond lengths are 2.29 Å. In the second Ni site, Ni(2) is bonded to one P(2) and three equivalent P(1) atoms to form distorted NiP4 tetrahedra that share  a cornercorner with one Ni(5)YbP4 tetrahedra, corners with two equivalent Ni(2)P4 tetrahedra, corners with three equivalent Ni(4)P4 tetrahedra, edges with two equivalent Ni(2)P4 tetrahedra, and edges with two equivalent Ni(5)YbP4 tetrahedra. The Ni(2)-P(2) bond length is 2.20 Å. There is one shorter (2.24 Å) and two longer (2.27 Å) Ni(2)-P(1) bond lengths. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to two equivalent Yb(2), one P(2), one P(6), and two equivalent P(4) atoms. The Ni(3)-P(2) bond length is 2.23 Å. The Ni(3)-P(6) bond length is 2.23 Å. Both Ni(3)-P(4) bond lengths are 2.39 Å. In the fourth Ni site, Ni(4) is bonded to one P(1) and three equivalent P(4) atoms to form distorted NiP4 tetrahedra that share  a cornercorner with one Ni(5)YbP4 tetrahedra, corners with two equivalent Ni(4)P4 tetrahedra, corners with three equivalent Ni(2)P4 tetrahedra, and edges with two equivalent Ni(4)P4 tetrahedra. The Ni(4)-P(1) bond length is 2.21 Å. There is one shorter (2.29 Å) and two longer (2.30 Å) Ni(4)-P(4) bond lengths. In the fifth Ni site, Ni(5) is bonded to one Yb(2), one P(1), one P(3), and two equivalent P(2) atoms to form distorted NiYbP4 tetrahedra that share  a cornercorner with one Ni(2)P4 tetrahedra,  a cornercorner with one Ni(4)P4 tetrahedra, corners with two equivalent Ni(5)YbP4 tetrahedra, and edges with two equivalent Ni(2)P4 tetrahedra. The Ni(5)-P(1) bond length is 2.33 Å. The Ni(5)-P(3) bond length is 2.22 Å. Both Ni(5)-P(2) bond lengths are 2.28 Å. In the sixth Ni site, Ni(6) is bonded in a 12-coordinate geometry to one Yb(1), two equivalent Yb(2), one Ni(9), two equivalent Ni(1), two equivalent Ni(8), two equivalent P(5), and two equivalent P(6) atoms. The Ni(6)-Ni(9) bond length is 2.51 Å. Both Ni(6)-Ni(8) bond lengths are 2.62 Å. Both Ni(6)-P(5) bond lengths are 2.27 Å. Both Ni(6)-P(6) bond lengths are 2.39 Å. In the seventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to two equivalent Yb(1), two equivalent Yb(2), one P(2), one P(5), and two equivalent P(3) atoms. The Ni(7)-P(2) bond length is 2.27 Å. The Ni(7)-P(5) bond length is 2.30 Å. Both Ni(7)-P(3) bond lengths are 2.39 Å. In the eighth Ni site, Ni(8) is bonded in a 4-coordinate geometry to two equivalent Yb(1), two equivalent Ni(6), one P(5), one P(6), and two equivalent P(3) atoms. The Ni(8)-P(5) bond length is 2.37 Å. The Ni(8)-P(6) bond length is 2.22 Å. Both Ni(8)-P(3) bond lengths are 2.29 Å. In the ninth Ni site, Ni(9) is bonded in a 6-coordinate geometry to one Yb(2), two equivalent Yb(3), one Ni(6), one P(3), one P(4), and two equivalent P(6) atoms. The Ni(9)-P(3) bond length is 2.34 Å. The Ni(9)-P(4) bond length is 2.23 Å. Both Ni(9)-P(6) bond lengths are 2.33 Å. In the tenth Ni site, Ni(10) is bonded in a 5-coordinate geometry to one P(4), two equivalent P(1), and two equivalent P(2) atoms. The Ni(10)-P(4) bond length is 2.26 Å. Both Ni(10)-P(1) bond lengths are 2.52 Å. Both Ni(10)-P(2) bond lengths are 2.57 Å. There are six inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Yb(3), one Ni(4), one Ni(5), two equivalent Ni(10), and three equivalent Ni(2) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Yb(2), one Ni(2), one Ni(3), one Ni(7), two equivalent Ni(10), and two equivalent Ni(5) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to one Yb(1), two equivalent Yb(3), one Ni(5), one Ni(9), two equivalent Ni(7), and two equivalent Ni(8) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Yb(3), one Ni(10), one Ni(9), two equivalent Ni(3), and three equivalent Ni(4) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Yb(1), two equivalent Yb(2), one Ni(1), one Ni(7), one Ni(8), and two equivalent Ni(6) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Yb(2), one Ni(1), one Ni(3), one Ni(8), two equivalent Ni(6), and two equivalent Ni(9) atoms.