TmCuAl crystallizes in the orthorhombic Imma space group. Tm(1) is bonded in a 12-coordinate geometry to six equivalent Cu(1) and six equivalent Al(1) atoms. Cu(1) is bonded to six equivalent Tm(1), two equivalent Cu(1), and four equivalent Al(1) atoms to form CuTm6Al4Cu2 cuboctahedra that share corners with eight equivalent Al(1)Tm6Al2Cu4 cuboctahedra, corners with ten equivalent Cu(1)Tm6Al4Cu2 cuboctahedra, edges with six equivalent Cu(1)Tm6Al4Cu2 cuboctahedra, faces with six equivalent Cu(1)Tm6Al4Cu2 cuboctahedra, and faces with twelve equivalent Al(1)Tm6Al2Cu4 cuboctahedra. Al(1) is bonded to six equivalent Tm(1), four equivalent Cu(1), and two equivalent Al(1) atoms to form AlTm6Al2Cu4 cuboctahedra that share corners with eight equivalent Cu(1)Tm6Al4Cu2 cuboctahedra, corners with ten equivalent Al(1)Tm6Al2Cu4 cuboctahedra, edges with six equivalent Al(1)Tm6Al2Cu4 cuboctahedra, faces with six equivalent Al(1)Tm6Al2Cu4 cuboctahedra, and faces with twelve equivalent Cu(1)Tm6Al4Cu2 cuboctahedra.
TmCuAl crystallizes in the orthorhombic Imma space group. Tm(1) is bonded in a 12-coordinate geometry to six equivalent Cu(1) and six equivalent Al(1) atoms. There are two shorter (3.11 Å) and four longer (3.15 Å) Tm(1)-Cu(1) bond lengths. There are two shorter (3.11 Å) and four longer (3.15 Å) Tm(1)-Al(1) bond lengths. Cu(1) is bonded to six equivalent Tm(1), two equivalent Cu(1), and four equivalent Al(1) atoms to form CuTm6Al4Cu2 cuboctahedra that share corners with eight equivalent Al(1)Tm6Al2Cu4 cuboctahedra, corners with ten equivalent Cu(1)Tm6Al4Cu2 cuboctahedra, edges with six equivalent Cu(1)Tm6Al4Cu2 cuboctahedra, faces with six equivalent Cu(1)Tm6Al4Cu2 cuboctahedra, and faces with twelve equivalent Al(1)Tm6Al2Cu4 cuboctahedra. Both Cu(1)-Cu(1) bond lengths are 2.69 Å. All Cu(1)-Al(1) bond lengths are 2.67 Å. Al(1) is bonded to six equivalent Tm(1), four equivalent Cu(1), and two equivalent Al(1) atoms to form AlTm6Al2Cu4 cuboctahedra that share corners with eight equivalent Cu(1)Tm6Al4Cu2 cuboctahedra, corners with ten equivalent Al(1)Tm6Al2Cu4 cuboctahedra, edges with six equivalent Al(1)Tm6Al2Cu4 cuboctahedra, faces with six equivalent Al(1)Tm6Al2Cu4 cuboctahedra, and faces with twelve equivalent Cu(1)Tm6Al4Cu2 cuboctahedra. Both Al(1)-Al(1) bond lengths are 2.69 Å.