U3(CoNi2)2 is Hexagonal Laves-derived structured and crystallizes in the triclinic P-1 space group. There are three inequivalent U sites. In the first U site, U(1) is bonded in a 12-coordinate geometry to one Co(1), one Co(3), two equivalent Co(2), one Ni(4), two equivalent Ni(1), two equivalent Ni(5), and three equivalent Ni(2) atoms. In the second U site, U(2) is bonded in a 12-coordinate geometry to one Co(2), two equivalent Co(1), two equivalent Co(3), one Ni(1), one Ni(5), two equivalent Ni(4), and three equivalent Ni(2) atoms. In the third U site, U(3) is bonded in a 12-coordinate geometry to three equivalent Co(2), three equivalent Ni(1), three equivalent Ni(3), and three equivalent Ni(5) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent U(1), four equivalent U(2), two equivalent Co(3), two equivalent Ni(2), and two equivalent Ni(4) atoms to form CoU6Co2Ni4 cuboctahedra that share corners with two equivalent Co(2)U6Ni6 cuboctahedra, corners with four equivalent Co(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(2)U6Co3Ni3 cuboctahedra, edges with two equivalent Co(1)U6Co2Ni4 cuboctahedra, edges with four equivalent Co(2)U6Ni6 cuboctahedra, faces with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, faces with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, faces with four equivalent Co(3)U6Co2Ni4 cuboctahedra, faces with four equivalent Ni(4)U6Co4Ni2 cuboctahedra, and faces with six equivalent Ni(2)U6Co3Ni3 cuboctahedra. In the second Co site, Co(2) is bonded to one U(2), two equivalent U(1), three equivalent U(3), one Ni(2), one Ni(3), two equivalent Ni(1), and two equivalent Ni(5) atoms to form CoU6Ni6 cuboctahedra that share  a cornercorner with one Co(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(2)U6Co3Ni3 cuboctahedra, corners with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, corners with five equivalent Co(2)U6Ni6 cuboctahedra, edges with two equivalent Co(1)U6Co2Ni4 cuboctahedra, edges with four equivalent Co(2)U6Ni6 cuboctahedra,  a faceface with one Co(3)U6Co2Ni4 cuboctahedra,  a faceface with one Ni(4)U6Co4Ni2 cuboctahedra, faces with three equivalent Ni(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(2)U6Co3Ni3 cuboctahedra, faces with five equivalent Ni(1)U6Co2Ni4 cuboctahedra, and faces with five equivalent Ni(5)U6Co2Ni4 cuboctahedra. In the third Co site, Co(3) is bonded to two equivalent U(1), four equivalent U(2), two equivalent Co(1), two equivalent Ni(2), and two equivalent Ni(4) atoms to form CoU6Co2Ni4 cuboctahedra that share corners with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Co(3)U6Co2Ni4 cuboctahedra, corners with four equivalent Co(2)U6Ni6 cuboctahedra, corners with four equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(2)U6Co3Ni3 cuboctahedra, edges with two equivalent Co(3)U6Co2Ni4 cuboctahedra, edges with four equivalent Ni(1)U6Co2Ni4 cuboctahedra, faces with two equivalent Co(2)U6Ni6 cuboctahedra, faces with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, faces with four equivalent Co(1)U6Co2Ni4 cuboctahedra, faces with four equivalent Ni(4)U6Co4Ni2 cuboctahedra, and faces with six equivalent Ni(2)U6Co3Ni3 cuboctahedra. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one U(2), two equivalent U(1), three equivalent U(3), two equivalent Co(2), one Ni(2), one Ni(3), and two equivalent Ni(5) atoms to form NiU6Co2Ni4 cuboctahedra that share  a cornercorner with one Co(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(2)U6Ni6 cuboctahedra, corners with two equivalent Ni(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(2)U6Co3Ni3 cuboctahedra, corners with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, corners with five equivalent Ni(1)U6Co2Ni4 cuboctahedra, edges with two equivalent Co(3)U6Co2Ni4 cuboctahedra, edges with four equivalent Ni(1)U6Co2Ni4 cuboctahedra,  a faceface with one Co(1)U6Co2Ni4 cuboctahedra,  a faceface with one Ni(4)U6Co4Ni2 cuboctahedra, faces with three equivalent Ni(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(2)U6Co3Ni3 cuboctahedra, faces with five equivalent Co(2)U6Ni6 cuboctahedra, and faces with five equivalent Ni(5)U6Co2Ni4 cuboctahedra. In the second Ni site, Ni(2) is bonded to three equivalent U(1), three equivalent U(2), one Co(1), one Co(2), one Co(3), one Ni(1), one Ni(4), and one Ni(5) atom to form NiU6Co3Ni3 cuboctahedra that share corners with two equivalent Co(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(2)U6Ni6 cuboctahedra, corners with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, corners with three equivalent Ni(3)U6Co2Ni4 cuboctahedra, corners with three equivalent Ni(2)U6Co3Ni3 cuboctahedra, edges with six equivalent Ni(2)U6Co3Ni3 cuboctahedra, faces with three equivalent Co(1)U6Co2Ni4 cuboctahedra, faces with three equivalent Co(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Co(2)U6Ni6 cuboctahedra, faces with three equivalent Ni(1)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(5)U6Co2Ni4 cuboctahedra, and faces with three equivalent Ni(4)U6Co4Ni2 cuboctahedra. In the third Ni site, Ni(3) is bonded to six equivalent U(3), two equivalent Co(2), two equivalent Ni(1), and two equivalent Ni(5) atoms to form NiU6Co2Ni4 cuboctahedra that share corners with four equivalent Co(2)U6Ni6 cuboctahedra, corners with four equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with six equivalent Ni(2)U6Co3Ni3 cuboctahedra, edges with six equivalent Ni(3)U6Co2Ni4 cuboctahedra, faces with six equivalent Co(2)U6Ni6 cuboctahedra, faces with six equivalent Ni(1)U6Co2Ni4 cuboctahedra, and faces with six equivalent Ni(5)U6Co2Ni4 cuboctahedra. In the fourth Ni site, Ni(4) is bonded to two equivalent U(1), four equivalent U(2), two equivalent Co(1), two equivalent Co(3), and two equivalent Ni(2) atoms to form NiU6Co4Ni2 cuboctahedra that share corners with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with four equivalent Co(2)U6Ni6 cuboctahedra, corners with four equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(2)U6Co3Ni3 cuboctahedra, corners with four equivalent Ni(4)U6Co4Ni2 cuboctahedra, edges with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, edges with four equivalent Ni(5)U6Co2Ni4 cuboctahedra, faces with two equivalent Co(2)U6Ni6 cuboctahedra, faces with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, faces with four equivalent Co(1)U6Co2Ni4 cuboctahedra, faces with four equivalent Co(3)U6Co2Ni4 cuboctahedra, and faces with six equivalent Ni(2)U6Co3Ni3 cuboctahedra. In the fifth Ni site, Ni(5) is bonded to one U(2), two equivalent U(1), three equivalent U(3), two equivalent Co(2), one Ni(2), one Ni(3), and two equivalent Ni(1) atoms to form NiU6Co2Ni4 cuboctahedra that share  a cornercorner with one Ni(4)U6Co4Ni2 cuboctahedra, corners with two equivalent Co(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(2)U6Ni6 cuboctahedra, corners with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(2)U6Co3Ni3 cuboctahedra, corners with five equivalent Ni(5)U6Co2Ni4 cuboctahedra, edges with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, edges with four equivalent Ni(5)U6Co2Ni4 cuboctahedra,  a faceface with one Co(1)U6Co2Ni4 cuboctahedra,  a faceface with one Co(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(2)U6Co3Ni3 cuboctahedra, faces with five equivalent Co(2)U6Ni6 cuboctahedra, and faces with five equivalent Ni(1)U6Co2Ni4 cuboctahedra.
U3(CoNi2)2 is Hexagonal Laves-derived structured and crystallizes in the triclinic P-1 space group. There are three inequivalent U sites. In the first U site, U(1) is bonded in a 12-coordinate geometry to one Co(1), one Co(3), two equivalent Co(2), one Ni(4), two equivalent Ni(1), two equivalent Ni(5), and three equivalent Ni(2) atoms. The U(1)-Co(1) bond length is 2.85 Å. The U(1)-Co(3) bond length is 2.88 Å. There is one shorter (2.88 Å) and one longer (2.89 Å) U(1)-Co(2) bond length. The U(1)-Ni(4) bond length is 2.90 Å. Both U(1)-Ni(1) bond lengths are 2.92 Å. There is one shorter (2.93 Å) and one longer (2.94 Å) U(1)-Ni(5) bond length. There is one shorter (2.91 Å) and two longer (2.93 Å) U(1)-Ni(2) bond lengths. In the second U site, U(2) is bonded in a 12-coordinate geometry to one Co(2), two equivalent Co(1), two equivalent Co(3), one Ni(1), one Ni(5), two equivalent Ni(4), and three equivalent Ni(2) atoms. The U(2)-Co(2) bond length is 2.90 Å. Both U(2)-Co(1) bond lengths are 2.86 Å. There is one shorter (2.89 Å) and one longer (2.90 Å) U(2)-Co(3) bond length. The U(2)-Ni(1) bond length is 2.92 Å. The U(2)-Ni(5) bond length is 2.94 Å. Both U(2)-Ni(4) bond lengths are 2.91 Å. All U(2)-Ni(2) bond lengths are 2.93 Å. In the third U site, U(3) is bonded in a 12-coordinate geometry to three equivalent Co(2), three equivalent Ni(1), three equivalent Ni(3), and three equivalent Ni(5) atoms. There are two shorter (2.86 Å) and one longer (2.87 Å) U(3)-Co(2) bond length. There are two shorter (2.91 Å) and one longer (2.92 Å) U(3)-Ni(1) bond length. There are a spread of U(3)-Ni(3) bond distances ranging from 2.92-2.94 Å. There is one shorter (2.91 Å) and two longer (2.93 Å) U(3)-Ni(5) bond lengths. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent U(1), four equivalent U(2), two equivalent Co(3), two equivalent Ni(2), and two equivalent Ni(4) atoms to form CoU6Co2Ni4 cuboctahedra that share corners with two equivalent Co(2)U6Ni6 cuboctahedra, corners with four equivalent Co(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(2)U6Co3Ni3 cuboctahedra, edges with two equivalent Co(1)U6Co2Ni4 cuboctahedra, edges with four equivalent Co(2)U6Ni6 cuboctahedra, faces with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, faces with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, faces with four equivalent Co(3)U6Co2Ni4 cuboctahedra, faces with four equivalent Ni(4)U6Co4Ni2 cuboctahedra, and faces with six equivalent Ni(2)U6Co3Ni3 cuboctahedra. Both Co(1)-Co(3) bond lengths are 2.52 Å. Both Co(1)-Ni(2) bond lengths are 2.50 Å. Both Co(1)-Ni(4) bond lengths are 2.50 Å. In the second Co site, Co(2) is bonded to one U(2), two equivalent U(1), three equivalent U(3), one Ni(2), one Ni(3), two equivalent Ni(1), and two equivalent Ni(5) atoms to form CoU6Ni6 cuboctahedra that share  a cornercorner with one Co(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(2)U6Co3Ni3 cuboctahedra, corners with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, corners with five equivalent Co(2)U6Ni6 cuboctahedra, edges with two equivalent Co(1)U6Co2Ni4 cuboctahedra, edges with four equivalent Co(2)U6Ni6 cuboctahedra,  a faceface with one Co(3)U6Co2Ni4 cuboctahedra,  a faceface with one Ni(4)U6Co4Ni2 cuboctahedra, faces with three equivalent Ni(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(2)U6Co3Ni3 cuboctahedra, faces with five equivalent Ni(1)U6Co2Ni4 cuboctahedra, and faces with five equivalent Ni(5)U6Co2Ni4 cuboctahedra. The Co(2)-Ni(2) bond length is 2.50 Å. The Co(2)-Ni(3) bond length is 2.49 Å. Both Co(2)-Ni(1) bond lengths are 2.52 Å. There is one shorter (2.50 Å) and one longer (2.51 Å) Co(2)-Ni(5) bond length. In the third Co site, Co(3) is bonded to two equivalent U(1), four equivalent U(2), two equivalent Co(1), two equivalent Ni(2), and two equivalent Ni(4) atoms to form CoU6Co2Ni4 cuboctahedra that share corners with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Co(3)U6Co2Ni4 cuboctahedra, corners with four equivalent Co(2)U6Ni6 cuboctahedra, corners with four equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(2)U6Co3Ni3 cuboctahedra, edges with two equivalent Co(3)U6Co2Ni4 cuboctahedra, edges with four equivalent Ni(1)U6Co2Ni4 cuboctahedra, faces with two equivalent Co(2)U6Ni6 cuboctahedra, faces with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, faces with four equivalent Co(1)U6Co2Ni4 cuboctahedra, faces with four equivalent Ni(4)U6Co4Ni2 cuboctahedra, and faces with six equivalent Ni(2)U6Co3Ni3 cuboctahedra. Both Co(3)-Ni(2) bond lengths are 2.45 Å. Both Co(3)-Ni(4) bond lengths are 2.46 Å. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one U(2), two equivalent U(1), three equivalent U(3), two equivalent Co(2), one Ni(2), one Ni(3), and two equivalent Ni(5) atoms to form NiU6Co2Ni4 cuboctahedra that share  a cornercorner with one Co(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(2)U6Ni6 cuboctahedra, corners with two equivalent Ni(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(2)U6Co3Ni3 cuboctahedra, corners with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, corners with five equivalent Ni(1)U6Co2Ni4 cuboctahedra, edges with two equivalent Co(3)U6Co2Ni4 cuboctahedra, edges with four equivalent Ni(1)U6Co2Ni4 cuboctahedra,  a faceface with one Co(1)U6Co2Ni4 cuboctahedra,  a faceface with one Ni(4)U6Co4Ni2 cuboctahedra, faces with three equivalent Ni(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(2)U6Co3Ni3 cuboctahedra, faces with five equivalent Co(2)U6Ni6 cuboctahedra, and faces with five equivalent Ni(5)U6Co2Ni4 cuboctahedra. The Ni(1)-Ni(2) bond length is 2.46 Å. The Ni(1)-Ni(3) bond length is 2.46 Å. Both Ni(1)-Ni(5) bond lengths are 2.46 Å. In the second Ni site, Ni(2) is bonded to three equivalent U(1), three equivalent U(2), one Co(1), one Co(2), one Co(3), one Ni(1), one Ni(4), and one Ni(5) atom to form NiU6Co3Ni3 cuboctahedra that share corners with two equivalent Co(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(2)U6Ni6 cuboctahedra, corners with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, corners with three equivalent Ni(3)U6Co2Ni4 cuboctahedra, corners with three equivalent Ni(2)U6Co3Ni3 cuboctahedra, edges with six equivalent Ni(2)U6Co3Ni3 cuboctahedra, faces with three equivalent Co(1)U6Co2Ni4 cuboctahedra, faces with three equivalent Co(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Co(2)U6Ni6 cuboctahedra, faces with three equivalent Ni(1)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(5)U6Co2Ni4 cuboctahedra, and faces with three equivalent Ni(4)U6Co4Ni2 cuboctahedra. The Ni(2)-Ni(4) bond length is 2.43 Å. The Ni(2)-Ni(5) bond length is 2.44 Å. In the third Ni site, Ni(3) is bonded to six equivalent U(3), two equivalent Co(2), two equivalent Ni(1), and two equivalent Ni(5) atoms to form NiU6Co2Ni4 cuboctahedra that share corners with four equivalent Co(2)U6Ni6 cuboctahedra, corners with four equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with six equivalent Ni(2)U6Co3Ni3 cuboctahedra, edges with six equivalent Ni(3)U6Co2Ni4 cuboctahedra, faces with six equivalent Co(2)U6Ni6 cuboctahedra, faces with six equivalent Ni(1)U6Co2Ni4 cuboctahedra, and faces with six equivalent Ni(5)U6Co2Ni4 cuboctahedra. Both Ni(3)-Ni(5) bond lengths are 2.44 Å. In the fourth Ni site, Ni(4) is bonded to two equivalent U(1), four equivalent U(2), two equivalent Co(1), two equivalent Co(3), and two equivalent Ni(2) atoms to form NiU6Co4Ni2 cuboctahedra that share corners with two equivalent Ni(5)U6Co2Ni4 cuboctahedra, corners with four equivalent Co(2)U6Ni6 cuboctahedra, corners with four equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with four equivalent Ni(2)U6Co3Ni3 cuboctahedra, corners with four equivalent Ni(4)U6Co4Ni2 cuboctahedra, edges with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, edges with four equivalent Ni(5)U6Co2Ni4 cuboctahedra, faces with two equivalent Co(2)U6Ni6 cuboctahedra, faces with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, faces with four equivalent Co(1)U6Co2Ni4 cuboctahedra, faces with four equivalent Co(3)U6Co2Ni4 cuboctahedra, and faces with six equivalent Ni(2)U6Co3Ni3 cuboctahedra. In the fifth Ni site, Ni(5) is bonded to one U(2), two equivalent U(1), three equivalent U(3), two equivalent Co(2), one Ni(2), one Ni(3), and two equivalent Ni(1) atoms to form NiU6Co2Ni4 cuboctahedra that share  a cornercorner with one Ni(4)U6Co4Ni2 cuboctahedra, corners with two equivalent Co(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Co(2)U6Ni6 cuboctahedra, corners with two equivalent Ni(1)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(3)U6Co2Ni4 cuboctahedra, corners with two equivalent Ni(2)U6Co3Ni3 cuboctahedra, corners with five equivalent Ni(5)U6Co2Ni4 cuboctahedra, edges with two equivalent Ni(4)U6Co4Ni2 cuboctahedra, edges with four equivalent Ni(5)U6Co2Ni4 cuboctahedra,  a faceface with one Co(1)U6Co2Ni4 cuboctahedra,  a faceface with one Co(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(3)U6Co2Ni4 cuboctahedra, faces with three equivalent Ni(2)U6Co3Ni3 cuboctahedra, faces with five equivalent Co(2)U6Ni6 cuboctahedra, and faces with five equivalent Ni(1)U6Co2Ni4 cuboctahedra.