Lu2Co3Al crystallizes in the trigonal R-3m space group. Lu(1) is bonded in a 16-coordinate geometry to four equivalent Lu(1), nine equivalent Co(1), and three equivalent Al(1) atoms. Co(1) is bonded to six equivalent Lu(1), four equivalent Co(1), and two equivalent Al(1) atoms to form distorted CoLu6Al2Co4 cuboctahedra that share corners with four equivalent Al(1)Lu6Co6 cuboctahedra, corners with fourteen equivalent Co(1)Lu6Al2Co4 cuboctahedra, edges with six equivalent Co(1)Lu6Al2Co4 cuboctahedra, faces with six equivalent Al(1)Lu6Co6 cuboctahedra, and faces with twelve equivalent Co(1)Lu6Al2Co4 cuboctahedra. Al(1) is bonded to six equivalent Lu(1) and six equivalent Co(1) atoms to form distorted AlLu6Co6 cuboctahedra that share corners with six equivalent Al(1)Lu6Co6 cuboctahedra, corners with twelve equivalent Co(1)Lu6Al2Co4 cuboctahedra, edges with six equivalent Al(1)Lu6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Lu6Al2Co4 cuboctahedra.
Lu2Co3Al crystallizes in the trigonal R-3m space group. Lu(1) is bonded in a 16-coordinate geometry to four equivalent Lu(1), nine equivalent Co(1), and three equivalent Al(1) atoms. There is one shorter (2.94 Å) and three longer (3.13 Å) Lu(1)-Lu(1) bond lengths. There are three shorter (2.78 Å) and six longer (2.99 Å) Lu(1)-Co(1) bond lengths. All Lu(1)-Al(1) bond lengths are 3.04 Å. Co(1) is bonded to six equivalent Lu(1), four equivalent Co(1), and two equivalent Al(1) atoms to form distorted CoLu6Al2Co4 cuboctahedra that share corners with four equivalent Al(1)Lu6Co6 cuboctahedra, corners with fourteen equivalent Co(1)Lu6Al2Co4 cuboctahedra, edges with six equivalent Co(1)Lu6Al2Co4 cuboctahedra, faces with six equivalent Al(1)Lu6Co6 cuboctahedra, and faces with twelve equivalent Co(1)Lu6Al2Co4 cuboctahedra. All Co(1)-Co(1) bond lengths are 2.60 Å. Both Co(1)-Al(1) bond lengths are 2.43 Å. Al(1) is bonded to six equivalent Lu(1) and six equivalent Co(1) atoms to form distorted AlLu6Co6 cuboctahedra that share corners with six equivalent Al(1)Lu6Co6 cuboctahedra, corners with twelve equivalent Co(1)Lu6Al2Co4 cuboctahedra, edges with six equivalent Al(1)Lu6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Lu6Al2Co4 cuboctahedra.