Pt3Co crystallizes in the trigonal R-3m space group. Co(1) is bonded to six equivalent Pt(1) atoms to form distorted CoPt6 cuboctahedra that share corners with six equivalent Pt(2)Pt12 cuboctahedra, edges with six equivalent Co(1)Pt6 cuboctahedra, and edges with six equivalent Pt(2)Pt12 cuboctahedra. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to three equivalent Co(1) and three equivalent Pt(2) atoms to form distorted PtCo3Pt3 cuboctahedra that share corners with six equivalent Pt(1)Co3Pt3 cuboctahedra, corners with six equivalent Pt(2)Pt12 cuboctahedra, edges with six equivalent Pt(2)Pt12 cuboctahedra, and edges with twelve equivalent Pt(1)Co3Pt3 cuboctahedra. In the second Pt site, Pt(2) is bonded to six equivalent Pt(1) and six equivalent Pt(2) atoms to form PtPt12 cuboctahedra that share corners with six equivalent Co(1)Pt6 cuboctahedra, corners with six equivalent Pt(2)Pt12 cuboctahedra, corners with twelve equivalent Pt(1)Co3Pt3 cuboctahedra, edges with six equivalent Co(1)Pt6 cuboctahedra, edges with six equivalent Pt(2)Pt12 cuboctahedra, edges with twelve equivalent Pt(1)Co3Pt3 cuboctahedra, and faces with six equivalent Pt(2)Pt12 cuboctahedra.
Pt3Co crystallizes in the trigonal R-3m space group. Co(1) is bonded to six equivalent Pt(1) atoms to form distorted CoPt6 cuboctahedra that share corners with six equivalent Pt(2)Pt12 cuboctahedra, edges with six equivalent Co(1)Pt6 cuboctahedra, and edges with six equivalent Pt(2)Pt12 cuboctahedra. All Co(1)-Pt(1) bond lengths are 2.63 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to three equivalent Co(1) and three equivalent Pt(2) atoms to form distorted PtCo3Pt3 cuboctahedra that share corners with six equivalent Pt(1)Co3Pt3 cuboctahedra, corners with six equivalent Pt(2)Pt12 cuboctahedra, edges with six equivalent Pt(2)Pt12 cuboctahedra, and edges with twelve equivalent Pt(1)Co3Pt3 cuboctahedra. All Pt(1)-Pt(2) bond lengths are 2.89 Å. In the second Pt site, Pt(2) is bonded to six equivalent Pt(1) and six equivalent Pt(2) atoms to form PtPt12 cuboctahedra that share corners with six equivalent Co(1)Pt6 cuboctahedra, corners with six equivalent Pt(2)Pt12 cuboctahedra, corners with twelve equivalent Pt(1)Co3Pt3 cuboctahedra, edges with six equivalent Co(1)Pt6 cuboctahedra, edges with six equivalent Pt(2)Pt12 cuboctahedra, edges with twelve equivalent Pt(1)Co3Pt3 cuboctahedra, and faces with six equivalent Pt(2)Pt12 cuboctahedra. All Pt(2)-Pt(2) bond lengths are 2.76 Å.