LaCu4Al crystallizes in the hexagonal P-6m2 space group. La(1) is bonded in a 18-coordinate geometry to three equivalent Cu(1), twelve equivalent Cu(2), and three equivalent Al(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to three equivalent La(1), six equivalent Cu(2), and three equivalent Al(1) atoms to form distorted CuLa3Al3Cu6 cuboctahedra that share corners with twelve equivalent Cu(2)La4Al2Cu6 cuboctahedra, edges with six equivalent Cu(1)La3Al3Cu6 cuboctahedra, faces with two equivalent Cu(1)La3Al3Cu6 cuboctahedra, and faces with eighteen equivalent Cu(2)La4Al2Cu6 cuboctahedra. In the second Cu site, Cu(2) is bonded to four equivalent La(1), two equivalent Cu(1), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuLa4Al2Cu6 cuboctahedra that share corners with four equivalent Cu(1)La3Al3Cu6 cuboctahedra, corners with sixteen equivalent Cu(2)La4Al2Cu6 cuboctahedra, edges with ten equivalent Cu(2)La4Al2Cu6 cuboctahedra, faces with six equivalent Cu(1)La3Al3Cu6 cuboctahedra, and faces with ten equivalent Cu(2)La4Al2Cu6 cuboctahedra. Al(1) is bonded in a 12-coordinate geometry to three equivalent La(1), three equivalent Cu(1), and six equivalent Cu(2) atoms.
LaCu4Al crystallizes in the hexagonal P-6m2 space group. La(1) is bonded in a 18-coordinate geometry to three equivalent Cu(1), twelve equivalent Cu(2), and three equivalent Al(1) atoms. All La(1)-Cu(1) bond lengths are 3.08 Å. All La(1)-Cu(2) bond lengths are 3.34 Å. All La(1)-Al(1) bond lengths are 3.08 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to three equivalent La(1), six equivalent Cu(2), and three equivalent Al(1) atoms to form distorted CuLa3Al3Cu6 cuboctahedra that share corners with twelve equivalent Cu(2)La4Al2Cu6 cuboctahedra, edges with six equivalent Cu(1)La3Al3Cu6 cuboctahedra, faces with two equivalent Cu(1)La3Al3Cu6 cuboctahedra, and faces with eighteen equivalent Cu(2)La4Al2Cu6 cuboctahedra. All Cu(1)-Cu(2) bond lengths are 2.53 Å. All Cu(1)-Al(1) bond lengths are 3.08 Å. In the second Cu site, Cu(2) is bonded to four equivalent La(1), two equivalent Cu(1), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuLa4Al2Cu6 cuboctahedra that share corners with four equivalent Cu(1)La3Al3Cu6 cuboctahedra, corners with sixteen equivalent Cu(2)La4Al2Cu6 cuboctahedra, edges with ten equivalent Cu(2)La4Al2Cu6 cuboctahedra, faces with six equivalent Cu(1)La3Al3Cu6 cuboctahedra, and faces with ten equivalent Cu(2)La4Al2Cu6 cuboctahedra. There are two shorter (2.65 Å) and two longer (2.68 Å) Cu(2)-Cu(2) bond lengths. Both Cu(2)-Al(1) bond lengths are 2.54 Å. Al(1) is bonded in a 12-coordinate geometry to three equivalent La(1), three equivalent Cu(1), and six equivalent Cu(2) atoms.