CePt4Cu crystallizes in the hexagonal P-6m2 space group. Ce(1) is bonded in a 18-coordinate geometry to three equivalent Pt(1), twelve equivalent Pt(2), and three equivalent Cu(1) atoms. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to three equivalent Ce(1), six equivalent Pt(2), and three equivalent Cu(1) atoms to form PtCe3Cu3Pt6 cuboctahedra that share corners with nine equivalent Cu(1)Ce3Pt9 cuboctahedra, corners with twelve equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra, edges with six equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, faces with two equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, faces with three equivalent Cu(1)Ce3Pt9 cuboctahedra, and faces with eighteen equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra. In the second Pt site, Pt(2) is bonded to four equivalent Ce(1), two equivalent Pt(1), four equivalent Pt(2), and two equivalent Cu(1) atoms to form distorted PtCe4Cu2Pt6 cuboctahedra that share corners with four equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, corners with four equivalent Cu(1)Ce3Pt9 cuboctahedra, corners with sixteen equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra, edges with ten equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra, faces with six equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, faces with six equivalent Cu(1)Ce3Pt9 cuboctahedra, and faces with ten equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra. Cu(1) is bonded to three equivalent Ce(1), three equivalent Pt(1), and six equivalent Pt(2) atoms to form distorted CuCe3Pt9 cuboctahedra that share corners with nine equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, corners with twelve equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra, edges with six equivalent Cu(1)Ce3Pt9 cuboctahedra, faces with two equivalent Cu(1)Ce3Pt9 cuboctahedra, faces with three equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, and faces with eighteen equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra.
CePt4Cu crystallizes in the hexagonal P-6m2 space group. Ce(1) is bonded in a 18-coordinate geometry to three equivalent Pt(1), twelve equivalent Pt(2), and three equivalent Cu(1) atoms. All Ce(1)-Pt(1) bond lengths are 3.10 Å. All Ce(1)-Pt(2) bond lengths are 3.46 Å. All Ce(1)-Cu(1) bond lengths are 3.10 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to three equivalent Ce(1), six equivalent Pt(2), and three equivalent Cu(1) atoms to form PtCe3Cu3Pt6 cuboctahedra that share corners with nine equivalent Cu(1)Ce3Pt9 cuboctahedra, corners with twelve equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra, edges with six equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, faces with two equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, faces with three equivalent Cu(1)Ce3Pt9 cuboctahedra, and faces with eighteen equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra. All Pt(1)-Pt(2) bond lengths are 2.69 Å. All Pt(1)-Cu(1) bond lengths are 3.10 Å. In the second Pt site, Pt(2) is bonded to four equivalent Ce(1), two equivalent Pt(1), four equivalent Pt(2), and two equivalent Cu(1) atoms to form distorted PtCe4Cu2Pt6 cuboctahedra that share corners with four equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, corners with four equivalent Cu(1)Ce3Pt9 cuboctahedra, corners with sixteen equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra, edges with ten equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra, faces with six equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, faces with six equivalent Cu(1)Ce3Pt9 cuboctahedra, and faces with ten equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra. There are two shorter (2.66 Å) and two longer (2.72 Å) Pt(2)-Pt(2) bond lengths. Both Pt(2)-Cu(1) bond lengths are 2.66 Å. Cu(1) is bonded to three equivalent Ce(1), three equivalent Pt(1), and six equivalent Pt(2) atoms to form distorted CuCe3Pt9 cuboctahedra that share corners with nine equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, corners with twelve equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra, edges with six equivalent Cu(1)Ce3Pt9 cuboctahedra, faces with two equivalent Cu(1)Ce3Pt9 cuboctahedra, faces with three equivalent Pt(1)Ce3Cu3Pt6 cuboctahedra, and faces with eighteen equivalent Pt(2)Ce4Cu2Pt6 cuboctahedra.