Sm5CuPb3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to six equivalent Pb(1) atoms. In the second Sm site, Sm(2) is bonded to two equivalent Cu(1) and five equivalent Pb(1) atoms to form a mixture of distorted corner, face, and edge-sharing SmCu2Pb5 pentagonal bipyramids. Cu(1) is bonded to six equivalent Sm(2) atoms to form face-sharing CuSm6 octahedra. Pb(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1) and five equivalent Sm(2) atoms.
Sm5CuPb3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to six equivalent Pb(1) atoms. All Sm(1)-Pb(1) bond lengths are 3.43 Å. In the second Sm site, Sm(2) is bonded to two equivalent Cu(1) and five equivalent Pb(1) atoms to form a mixture of distorted corner, face, and edge-sharing SmCu2Pb5 pentagonal bipyramids. Both Sm(2)-Cu(1) bond lengths are 2.97 Å. There are a spread of Sm(2)-Pb(1) bond distances ranging from 3.26-3.69 Å. Cu(1) is bonded to six equivalent Sm(2) atoms to form face-sharing CuSm6 octahedra. Pb(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1) and five equivalent Sm(2) atoms.