Sm2(CuSn)3 crystallizes in the orthorhombic Pmmm space group. Sm(1) is bonded in a 6-coordinate geometry to four equivalent Sm(1), one Cu(1), and one Sn(1) atom. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 6-coordinate geometry to one Sm(1), four equivalent Cu(1), and one Sn(2) atom. In the second Cu site, Cu(2) is bonded to four equivalent Cu(2) and two equivalent Sn(1) atoms to form distorted CuCu4Sn2 octahedra that share corners with four equivalent Cu(2)Cu4Sn2 octahedra, edges with four equivalent Cu(2)Cu4Sn2 octahedra, and edges with eight equivalent Sn(1)SmCuSn4 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Sm(1), one Cu(2), and four equivalent Sn(1) atoms to form distorted SnSmCuSn4 octahedra that share corners with five equivalent Sn(1)SmCuSn4 octahedra, edges with four equivalent Cu(2)Cu4Sn2 octahedra, and edges with four equivalent Sn(1)SmCuSn4 octahedra. The corner-sharing octahedra are not tilted. In the second Sn site, Sn(2) is bonded to two equivalent Cu(1) and four equivalent Sn(2) atoms to form a mixture of distorted corner and edge-sharing SnCu2Sn4 octahedra. The corner-sharing octahedra are not tilted.
Sm2(CuSn)3 crystallizes in the orthorhombic Pmmm space group. Sm(1) is bonded in a 6-coordinate geometry to four equivalent Sm(1), one Cu(1), and one Sn(1) atom. There are two shorter (2.87 Å) and two longer (3.21 Å) Sm(1)-Sm(1) bond lengths. The Sm(1)-Cu(1) bond length is 2.85 Å. The Sm(1)-Sn(1) bond length is 3.19 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 6-coordinate geometry to one Sm(1), four equivalent Cu(1), and one Sn(2) atom. There are two shorter (2.87 Å) and two longer (3.21 Å) Cu(1)-Cu(1) bond lengths. The Cu(1)-Sn(2) bond length is 2.66 Å. In the second Cu site, Cu(2) is bonded to four equivalent Cu(2) and two equivalent Sn(1) atoms to form distorted CuCu4Sn2 octahedra that share corners with four equivalent Cu(2)Cu4Sn2 octahedra, edges with four equivalent Cu(2)Cu4Sn2 octahedra, and edges with eight equivalent Sn(1)SmCuSn4 octahedra. The corner-sharing octahedra are not tilted. There are two shorter (2.87 Å) and two longer (3.21 Å) Cu(2)-Cu(2) bond lengths. Both Cu(2)-Sn(1) bond lengths are 2.52 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Sm(1), one Cu(2), and four equivalent Sn(1) atoms to form distorted SnSmCuSn4 octahedra that share corners with five equivalent Sn(1)SmCuSn4 octahedra, edges with four equivalent Cu(2)Cu4Sn2 octahedra, and edges with four equivalent Sn(1)SmCuSn4 octahedra. The corner-sharing octahedra are not tilted. There are two shorter (2.87 Å) and two longer (3.21 Å) Sn(1)-Sn(1) bond lengths. In the second Sn site, Sn(2) is bonded to two equivalent Cu(1) and four equivalent Sn(2) atoms to form a mixture of distorted corner and edge-sharing SnCu2Sn4 octahedra. The corner-sharing octahedra are not tilted. There are two shorter (2.87 Å) and two longer (3.21 Å) Sn(2)-Sn(2) bond lengths.