Sm(AuAl)2 crystallizes in the tetragonal P4/nmm space group. Sm(1) is bonded in a 16-coordinate geometry to four equivalent Au(1), four equivalent Au(2), four equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded to four equivalent Sm(1) and four equivalent Al(2) atoms to form distorted AuSm4Al4 tetrahedra that share corners with twelve equivalent Al(1)Sm4Au4 tetrahedra, edges with two equivalent Al(1)Sm4Au4 tetrahedra, edges with four equivalent Au(1)Sm4Al4 tetrahedra, and faces with four equivalent Au(1)Sm4Al4 tetrahedra. In the second Au site, Au(2) is bonded in a 5-coordinate geometry to four equivalent Sm(1), one Al(2), and four equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Sm(1) and four equivalent Au(2) atoms to form AlSm4Au4 tetrahedra that share corners with twelve equivalent Au(1)Sm4Al4 tetrahedra, edges with two equivalent Au(1)Sm4Al4 tetrahedra, edges with four equivalent Al(1)Sm4Au4 tetrahedra, and faces with four equivalent Al(1)Sm4Au4 tetrahedra. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to four equivalent Sm(1), one Au(2), and four equivalent Au(1) atoms.
Sm(AuAl)2 crystallizes in the tetragonal P4/nmm space group. Sm(1) is bonded in a 16-coordinate geometry to four equivalent Au(1), four equivalent Au(2), four equivalent Al(1), and four equivalent Al(2) atoms. All Sm(1)-Au(1) bond lengths are 3.40 Å. All Sm(1)-Au(2) bond lengths are 3.32 Å. All Sm(1)-Al(1) bond lengths are 3.42 Å. All Sm(1)-Al(2) bond lengths are 3.31 Å. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded to four equivalent Sm(1) and four equivalent Al(2) atoms to form distorted AuSm4Al4 tetrahedra that share corners with twelve equivalent Al(1)Sm4Au4 tetrahedra, edges with two equivalent Al(1)Sm4Au4 tetrahedra, edges with four equivalent Au(1)Sm4Al4 tetrahedra, and faces with four equivalent Au(1)Sm4Al4 tetrahedra. All Au(1)-Al(2) bond lengths are 2.58 Å. In the second Au site, Au(2) is bonded in a 5-coordinate geometry to four equivalent Sm(1), one Al(2), and four equivalent Al(1) atoms. The Au(2)-Al(2) bond length is 2.48 Å. All Au(2)-Al(1) bond lengths are 2.57 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Sm(1) and four equivalent Au(2) atoms to form AlSm4Au4 tetrahedra that share corners with twelve equivalent Au(1)Sm4Al4 tetrahedra, edges with two equivalent Au(1)Sm4Al4 tetrahedra, edges with four equivalent Al(1)Sm4Au4 tetrahedra, and faces with four equivalent Al(1)Sm4Au4 tetrahedra. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to four equivalent Sm(1), one Au(2), and four equivalent Au(1) atoms.