TbCu5 crystallizes in the cubic F-43m space group. Tb(1) is bonded in a 16-coordinate geometry to four equivalent Cu(1) and twelve equivalent Cu(2) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent Tb(1) and twelve equivalent Cu(2) atoms to form distorted CuTb4Cu12 tetrahedra that share corners with twelve equivalent Cu(2)Tb3Cu9 cuboctahedra, faces with twenty-eight equivalent Cu(2)Tb3Cu9 cuboctahedra, and faces with twelve equivalent Cu(1)Tb4Cu12 tetrahedra. In the second Cu site, Cu(2) is bonded to three equivalent Tb(1), three equivalent Cu(1), and six equivalent Cu(2) atoms to form distorted CuTb3Cu9 cuboctahedra that share corners with eighteen equivalent Cu(2)Tb3Cu9 cuboctahedra, corners with three equivalent Cu(1)Tb4Cu12 tetrahedra, edges with six equivalent Cu(2)Tb3Cu9 cuboctahedra, faces with eighteen equivalent Cu(2)Tb3Cu9 cuboctahedra, and faces with seven equivalent Cu(1)Tb4Cu12 tetrahedra.
TbCu5 crystallizes in the cubic F-43m space group. Tb(1) is bonded in a 16-coordinate geometry to four equivalent Cu(1) and twelve equivalent Cu(2) atoms. All Tb(1)-Cu(1) bond lengths are 3.02 Å. All Tb(1)-Cu(2) bond lengths are 2.89 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent Tb(1) and twelve equivalent Cu(2) atoms to form distorted CuTb4Cu12 tetrahedra that share corners with twelve equivalent Cu(2)Tb3Cu9 cuboctahedra, faces with twenty-eight equivalent Cu(2)Tb3Cu9 cuboctahedra, and faces with twelve equivalent Cu(1)Tb4Cu12 tetrahedra. All Cu(1)-Cu(2) bond lengths are 2.89 Å. In the second Cu site, Cu(2) is bonded to three equivalent Tb(1), three equivalent Cu(1), and six equivalent Cu(2) atoms to form distorted CuTb3Cu9 cuboctahedra that share corners with eighteen equivalent Cu(2)Tb3Cu9 cuboctahedra, corners with three equivalent Cu(1)Tb4Cu12 tetrahedra, edges with six equivalent Cu(2)Tb3Cu9 cuboctahedra, faces with eighteen equivalent Cu(2)Tb3Cu9 cuboctahedra, and faces with seven equivalent Cu(1)Tb4Cu12 tetrahedra. There are three shorter (2.44 Å) and three longer (2.49 Å) Cu(2)-Cu(2) bond lengths.