Pt2CoNi crystallizes in the trigonal R3m space group. Co(1) is bonded to six equivalent Co(1), three equivalent Pt(2), and three equivalent Ni(1) atoms to form distorted CoCo6Ni3Pt3 cuboctahedra that share corners with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, corners with six equivalent Pt(2)Co3Pt3 cuboctahedra, corners with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, edges with six equivalent Pt(2)Co3Pt3 cuboctahedra, edges with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, faces with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, and faces with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to three equivalent Pt(2), six equivalent Pt(1), and three equivalent Ni(1) atoms to form distorted PtNi3Pt9 cuboctahedra that share corners with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, corners with six equivalent Pt(2)Co3Pt3 cuboctahedra, corners with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, edges with six equivalent Pt(2)Co3Pt3 cuboctahedra, edges with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, faces with six equivalent Pt(1)Ni3Pt9 cuboctahedra, and faces with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra. In the second Pt site, Pt(2) is bonded to three equivalent Co(1) and three equivalent Pt(1) atoms to form distorted PtCo3Pt3 cuboctahedra that share corners with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, corners with six equivalent Pt(1)Ni3Pt9 cuboctahedra, corners with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, edges with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, edges with six equivalent Pt(2)Co3Pt3 cuboctahedra, edges with six equivalent Pt(1)Ni3Pt9 cuboctahedra, and edges with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra. Ni(1) is bonded to three equivalent Co(1), three equivalent Pt(1), and six equivalent Ni(1) atoms to form distorted NiCo3Ni6Pt3 cuboctahedra that share corners with six equivalent Pt(2)Co3Pt3 cuboctahedra, corners with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, edges with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, edges with six equivalent Pt(2)Co3Pt3 cuboctahedra, edges with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, faces with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, faces with six equivalent Pt(1)Ni3Pt9 cuboctahedra, and faces with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra.
Pt2CoNi crystallizes in the trigonal R3m space group. Co(1) is bonded to six equivalent Co(1), three equivalent Pt(2), and three equivalent Ni(1) atoms to form distorted CoCo6Ni3Pt3 cuboctahedra that share corners with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, corners with six equivalent Pt(2)Co3Pt3 cuboctahedra, corners with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, edges with six equivalent Pt(2)Co3Pt3 cuboctahedra, edges with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, faces with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, and faces with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra. All Co(1)-Co(1) bond lengths are 2.72 Å. All Co(1)-Pt(2) bond lengths are 2.65 Å. All Co(1)-Ni(1) bond lengths are 2.45 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to three equivalent Pt(2), six equivalent Pt(1), and three equivalent Ni(1) atoms to form distorted PtNi3Pt9 cuboctahedra that share corners with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, corners with six equivalent Pt(2)Co3Pt3 cuboctahedra, corners with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, edges with six equivalent Pt(2)Co3Pt3 cuboctahedra, edges with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, faces with six equivalent Pt(1)Ni3Pt9 cuboctahedra, and faces with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra. All Pt(1)-Pt(2) bond lengths are 2.94 Å. All Pt(1)-Pt(1) bond lengths are 2.72 Å. All Pt(1)-Ni(1) bond lengths are 2.68 Å. In the second Pt site, Pt(2) is bonded to three equivalent Co(1) and three equivalent Pt(1) atoms to form distorted PtCo3Pt3 cuboctahedra that share corners with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, corners with six equivalent Pt(1)Ni3Pt9 cuboctahedra, corners with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, edges with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, edges with six equivalent Pt(2)Co3Pt3 cuboctahedra, edges with six equivalent Pt(1)Ni3Pt9 cuboctahedra, and edges with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra. Ni(1) is bonded to three equivalent Co(1), three equivalent Pt(1), and six equivalent Ni(1) atoms to form distorted NiCo3Ni6Pt3 cuboctahedra that share corners with six equivalent Pt(2)Co3Pt3 cuboctahedra, corners with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, edges with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, edges with six equivalent Pt(2)Co3Pt3 cuboctahedra, edges with six equivalent Pt(1)Ni3Pt9 cuboctahedra, edges with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra, faces with six equivalent Co(1)Co6Ni3Pt3 cuboctahedra, faces with six equivalent Pt(1)Ni3Pt9 cuboctahedra, and faces with six equivalent Ni(1)Co3Ni6Pt3 cuboctahedra. All Ni(1)-Ni(1) bond lengths are 2.72 Å.