Y2Ni12Cu5 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 18-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), four equivalent Ni(5), and eight equivalent Ni(4) atoms. In the second Y site, Y(2) is bonded in a 20-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(5), four equivalent Ni(4), two equivalent Cu(1), two equivalent Cu(3), and four equivalent Cu(2) atoms. There are five inequivalent Ni sites. In the first Ni site, Ni(4) is bonded to one Y(2), two equivalent Y(1), one Ni(1), one Ni(3), one Ni(4), one Ni(5), two equivalent Ni(2), one Cu(1), one Cu(2), and one Cu(3) atom to form distorted NiY3Cu3Ni6 cuboctahedra that share  a cornercorner with one Cu(3)Y2Cu2Ni8 cuboctahedra, corners with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with three equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with three equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with three equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with seven equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Ni(1)Y2Cu4Ni6 cuboctahedra,  an edgeedge with one Ni(3)Y2Cu4Ni6 cuboctahedra,  an edgeedge with one Cu(3)Y2Cu2Ni8 cuboctahedra, edges with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, edges with three equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  a faceface with one Cu(2)Y2Cu2Ni8 cuboctahedra,  a faceface with one Cu(3)Y2Cu2Ni8 cuboctahedra, faces with three equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, faces with three equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with three equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, and faces with five equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. In the second Ni site, Ni(5) is bonded to one Y(2), two equivalent Y(1), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), one Cu(1), and two equivalent Cu(2) atoms to form distorted NiY3Cu3Ni6 cuboctahedra that share corners with two equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with three equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, corners with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Ni(5)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Cu(3)Y2Cu2Ni8 cuboctahedra, edges with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, edges with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, faces with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, and faces with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. In the third Ni site, Ni(1) is bonded to one Y(1), one Y(2), one Ni(1), one Ni(3), two equivalent Ni(4), two equivalent Ni(5), two equivalent Cu(1), and two equivalent Cu(2) atoms to form distorted NiY2Cu4Ni6 cuboctahedra that share corners with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, corners with three equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with five equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Ni(2)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra,  a faceface with one Ni(1)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, and faces with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. In the fourth Ni site, Ni(2) is bonded to one Y(1), one Y(2), one Ni(2), one Ni(3), four equivalent Ni(4), two equivalent Cu(1), and two equivalent Cu(3) atoms to form distorted NiY2Cu4Ni6 cuboctahedra that share corners with three equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, corners with four equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with five equivalent Ni(3)Y2Cu4Ni6 cuboctahedra,  an edgeedge with one Ni(1)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, faces with two equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, faces with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, faces with three equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, and faces with eight equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. In the fifth Ni site, Ni(3) is bonded to one Y(1), one Y(2), one Ni(1), one Ni(2), two equivalent Ni(4), two equivalent Ni(5), two equivalent Cu(1), and two equivalent Cu(2) atoms to form distorted NiY2Cu4Ni6 cuboctahedra that share corners with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, corners with five equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with five equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Ni(3)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra,  a faceface with one Ni(3)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, faces with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, faces with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, and faces with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 14-coordinate geometry to one Y(2), one Ni(5), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), one Cu(1), one Cu(3), and two equivalent Cu(2) atoms. In the second Cu site, Cu(2) is bonded to two equivalent Y(2), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), two equivalent Ni(5), and two equivalent Cu(1) atoms to form CuY2Cu2Ni8 cuboctahedra that share corners with two equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, corners with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with eight equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, faces with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, and faces with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra. In the third Cu site, Cu(3) is bonded to two equivalent Y(2), four equivalent Ni(2), four equivalent Ni(4), and two equivalent Cu(1) atoms to form CuY2Cu2Ni8 cuboctahedra that share corners with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, corners with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with six equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, edges with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, faces with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, and faces with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra.
Y2Ni12Cu5 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 18-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), four equivalent Ni(5), and eight equivalent Ni(4) atoms. Both Y(1)-Ni(1) bond lengths are 2.88 Å. Both Y(1)-Ni(2) bond lengths are 2.89 Å. Both Y(1)-Ni(3) bond lengths are 2.89 Å. There are two shorter (3.03 Å) and two longer (3.21 Å) Y(1)-Ni(5) bond lengths. There are four shorter (3.03 Å) and four longer (3.22 Å) Y(1)-Ni(4) bond lengths. In the second Y site, Y(2) is bonded in a 20-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(5), four equivalent Ni(4), two equivalent Cu(1), two equivalent Cu(3), and four equivalent Cu(2) atoms. Both Y(2)-Ni(1) bond lengths are 2.98 Å. Both Y(2)-Ni(2) bond lengths are 2.97 Å. Both Y(2)-Ni(3) bond lengths are 2.98 Å. Both Y(2)-Ni(5) bond lengths are 3.08 Å. All Y(2)-Ni(4) bond lengths are 3.08 Å. Both Y(2)-Cu(1) bond lengths are 2.89 Å. Both Y(2)-Cu(3) bond lengths are 3.14 Å. All Y(2)-Cu(2) bond lengths are 3.15 Å. There are five inequivalent Ni sites. In the first Ni site, Ni(4) is bonded to one Y(2), two equivalent Y(1), one Ni(1), one Ni(3), one Ni(4), one Ni(5), two equivalent Ni(2), one Cu(1), one Cu(2), and one Cu(3) atom to form distorted NiY3Cu3Ni6 cuboctahedra that share  a cornercorner with one Cu(3)Y2Cu2Ni8 cuboctahedra, corners with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with three equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with three equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with three equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with seven equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Ni(1)Y2Cu4Ni6 cuboctahedra,  an edgeedge with one Ni(3)Y2Cu4Ni6 cuboctahedra,  an edgeedge with one Cu(3)Y2Cu2Ni8 cuboctahedra, edges with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, edges with three equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  a faceface with one Cu(2)Y2Cu2Ni8 cuboctahedra,  a faceface with one Cu(3)Y2Cu2Ni8 cuboctahedra, faces with three equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, faces with three equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with three equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, and faces with five equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. The Ni(4)-Ni(1) bond length is 2.52 Å. The Ni(4)-Ni(3) bond length is 2.50 Å. The Ni(4)-Ni(4) bond length is 2.38 Å. The Ni(4)-Ni(5) bond length is 2.39 Å. There is one shorter (2.50 Å) and one longer (2.52 Å) Ni(4)-Ni(2) bond length. The Ni(4)-Cu(1) bond length is 2.64 Å. The Ni(4)-Cu(2) bond length is 2.42 Å. The Ni(4)-Cu(3) bond length is 2.43 Å. In the second Ni site, Ni(5) is bonded to one Y(2), two equivalent Y(1), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), one Cu(1), and two equivalent Cu(2) atoms to form distorted NiY3Cu3Ni6 cuboctahedra that share corners with two equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with three equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, corners with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Ni(5)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Cu(3)Y2Cu2Ni8 cuboctahedra, edges with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, edges with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, faces with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, and faces with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. Both Ni(5)-Ni(1) bond lengths are 2.50 Å. Both Ni(5)-Ni(3) bond lengths are 2.52 Å. The Ni(5)-Cu(1) bond length is 2.63 Å. Both Ni(5)-Cu(2) bond lengths are 2.43 Å. In the third Ni site, Ni(1) is bonded to one Y(1), one Y(2), one Ni(1), one Ni(3), two equivalent Ni(4), two equivalent Ni(5), two equivalent Cu(1), and two equivalent Cu(2) atoms to form distorted NiY2Cu4Ni6 cuboctahedra that share corners with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, corners with three equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with five equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Ni(2)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra,  a faceface with one Ni(1)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, and faces with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. The Ni(1)-Ni(1) bond length is 2.40 Å. The Ni(1)-Ni(3) bond length is 2.58 Å. Both Ni(1)-Cu(1) bond lengths are 2.75 Å. Both Ni(1)-Cu(2) bond lengths are 2.42 Å. In the fourth Ni site, Ni(2) is bonded to one Y(1), one Y(2), one Ni(2), one Ni(3), four equivalent Ni(4), two equivalent Cu(1), and two equivalent Cu(3) atoms to form distorted NiY2Cu4Ni6 cuboctahedra that share corners with three equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, corners with four equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with five equivalent Ni(3)Y2Cu4Ni6 cuboctahedra,  an edgeedge with one Ni(1)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, faces with two equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, faces with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, faces with three equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, and faces with eight equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. The Ni(2)-Ni(2) bond length is 2.59 Å. The Ni(2)-Ni(3) bond length is 2.40 Å. Both Ni(2)-Cu(1) bond lengths are 2.76 Å. Both Ni(2)-Cu(3) bond lengths are 2.42 Å. In the fifth Ni site, Ni(3) is bonded to one Y(1), one Y(2), one Ni(1), one Ni(2), two equivalent Ni(4), two equivalent Ni(5), two equivalent Cu(1), and two equivalent Cu(2) atoms to form distorted NiY2Cu4Ni6 cuboctahedra that share corners with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, corners with five equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with five equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra,  an edgeedge with one Ni(3)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra,  a faceface with one Ni(3)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, faces with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, faces with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, and faces with six equivalent Ni(4)Y3Cu3Ni6 cuboctahedra. Both Ni(3)-Cu(1) bond lengths are 2.76 Å. Both Ni(3)-Cu(2) bond lengths are 2.42 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 14-coordinate geometry to one Y(2), one Ni(5), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), one Cu(1), one Cu(3), and two equivalent Cu(2) atoms. The Cu(1)-Cu(1) bond length is 2.36 Å. The Cu(1)-Cu(3) bond length is 2.55 Å. Both Cu(1)-Cu(2) bond lengths are 2.55 Å. In the second Cu site, Cu(2) is bonded to two equivalent Y(2), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), two equivalent Ni(5), and two equivalent Cu(1) atoms to form CuY2Cu2Ni8 cuboctahedra that share corners with two equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, corners with two equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, corners with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, corners with eight equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, edges with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with two equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, faces with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, and faces with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra. In the third Cu site, Cu(3) is bonded to two equivalent Y(2), four equivalent Ni(2), four equivalent Ni(4), and two equivalent Cu(1) atoms to form CuY2Cu2Ni8 cuboctahedra that share corners with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, corners with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, corners with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra, corners with six equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with two equivalent Ni(5)Y3Cu3Ni6 cuboctahedra, edges with four equivalent Ni(1)Y2Cu4Ni6 cuboctahedra, edges with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, faces with two equivalent Cu(3)Y2Cu2Ni8 cuboctahedra, faces with four equivalent Ni(2)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(3)Y2Cu4Ni6 cuboctahedra, faces with four equivalent Ni(4)Y3Cu3Ni6 cuboctahedra, and faces with four equivalent Cu(2)Y2Cu2Ni8 cuboctahedra.