TmCu4Al crystallizes in the hexagonal P-6m2 space group. Tm(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 Tm(1), six equivalent Cu(2), and three equivalent Al(1) atoms to form CuTm3Al3Cu6 cuboctahedra that share corners with nine equivalent Al(1)Tm3Cu9 cuboctahedra, corners with twelve equivalent Cu(2)Tm4Al2Cu6 cuboctahedra, edges with six equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, faces with two equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, faces with three equivalent Al(1)Tm3Cu9 cuboctahedra, and faces with eighteen equivalent Cu(2)Tm4Al2Cu6 cuboctahedra. In the second Cu site, Cu(2) is bonded to four equivalent Tm(1), two equivalent Cu(1), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuTm4Al2Cu6 cuboctahedra that share corners with four equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, corners with four equivalent Al(1)Tm3Cu9 cuboctahedra, corners with sixteen equivalent Cu(2)Tm4Al2Cu6 cuboctahedra, edges with ten equivalent Cu(2)Tm4Al2Cu6 cuboctahedra, faces with six equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, faces with six equivalent Al(1)Tm3Cu9 cuboctahedra, and faces with ten equivalent Cu(2)Tm4Al2Cu6 cuboctahedra. Al(1) is bonded to three equivalent Tm(1), three equivalent Cu(1), and six equivalent Cu(2) atoms to form distorted AlTm3Cu9 cuboctahedra that share corners with nine equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, corners with twelve equivalent Cu(2)Tm4Al2Cu6 cuboctahedra, edges with six equivalent Al(1)Tm3Cu9 cuboctahedra, faces with two equivalent Al(1)Tm3Cu9 cuboctahedra, faces with three equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, and faces with eighteen equivalent Cu(2)Tm4Al2Cu6 cuboctahedra.
TmCu4Al crystallizes in the hexagonal P-6m2 space group. Tm(1) is bonded in a 18-coordinate geometry to three equivalent Cu(1), twelve equivalent Cu(2), and three equivalent Al(1) atoms. All Tm(1)-Cu(1) bond lengths are 2.95 Å. All Tm(1)-Cu(2) bond lengths are 3.26 Å. All Tm(1)-Al(1) bond lengths are 2.95 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to three equivalent Tm(1), six equivalent Cu(2), and three equivalent Al(1) atoms to form CuTm3Al3Cu6 cuboctahedra that share corners with nine equivalent Al(1)Tm3Cu9 cuboctahedra, corners with twelve equivalent Cu(2)Tm4Al2Cu6 cuboctahedra, edges with six equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, faces with two equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, faces with three equivalent Al(1)Tm3Cu9 cuboctahedra, and faces with eighteen equivalent Cu(2)Tm4Al2Cu6 cuboctahedra. All Cu(1)-Cu(2) bond lengths are 2.50 Å. All Cu(1)-Al(1) bond lengths are 2.95 Å. In the second Cu site, Cu(2) is bonded to four equivalent Tm(1), two equivalent Cu(1), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuTm4Al2Cu6 cuboctahedra that share corners with four equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, corners with four equivalent Al(1)Tm3Cu9 cuboctahedra, corners with sixteen equivalent Cu(2)Tm4Al2Cu6 cuboctahedra, edges with ten equivalent Cu(2)Tm4Al2Cu6 cuboctahedra, faces with six equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, faces with six equivalent Al(1)Tm3Cu9 cuboctahedra, and faces with ten equivalent Cu(2)Tm4Al2Cu6 cuboctahedra. There are two shorter (2.55 Å) and two longer (2.57 Å) Cu(2)-Cu(2) bond lengths. Both Cu(2)-Al(1) bond lengths are 2.50 Å. Al(1) is bonded to three equivalent Tm(1), three equivalent Cu(1), and six equivalent Cu(2) atoms to form distorted AlTm3Cu9 cuboctahedra that share corners with nine equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, corners with twelve equivalent Cu(2)Tm4Al2Cu6 cuboctahedra, edges with six equivalent Al(1)Tm3Cu9 cuboctahedra, faces with two equivalent Al(1)Tm3Cu9 cuboctahedra, faces with three equivalent Cu(1)Tm3Al3Cu6 cuboctahedra, and faces with eighteen equivalent Cu(2)Tm4Al2Cu6 cuboctahedra.