CeIr5 crystallizes in the cubic F-43m space group. Ce(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1) and twelve equivalent Ir(2) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Ce(1) and twelve equivalent Ir(2) atoms to form distorted IrCe4Ir12 tetrahedra that share corners with twelve equivalent Ir(2)Ce3Ir9 cuboctahedra, faces with twenty-eight equivalent Ir(2)Ce3Ir9 cuboctahedra, and faces with twelve equivalent Ir(1)Ce4Ir12 tetrahedra. In the second Ir site, Ir(2) is bonded to three equivalent Ce(1), three equivalent Ir(1), and six equivalent Ir(2) atoms to form distorted IrCe3Ir9 cuboctahedra that share corners with eighteen equivalent Ir(2)Ce3Ir9 cuboctahedra, corners with three equivalent Ir(1)Ce4Ir12 tetrahedra, edges with six equivalent Ir(2)Ce3Ir9 cuboctahedra, faces with eighteen equivalent Ir(2)Ce3Ir9 cuboctahedra, and faces with seven equivalent Ir(1)Ce4Ir12 tetrahedra.
CeIr5 crystallizes in the cubic F-43m space group. Ce(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1) and twelve equivalent Ir(2) atoms. All Ce(1)-Ir(1) bond lengths are 3.22 Å. All Ce(1)-Ir(2) bond lengths are 3.09 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Ce(1) and twelve equivalent Ir(2) atoms to form distorted IrCe4Ir12 tetrahedra that share corners with twelve equivalent Ir(2)Ce3Ir9 cuboctahedra, faces with twenty-eight equivalent Ir(2)Ce3Ir9 cuboctahedra, and faces with twelve equivalent Ir(1)Ce4Ir12 tetrahedra. All Ir(1)-Ir(2) bond lengths are 3.09 Å. In the second Ir site, Ir(2) is bonded to three equivalent Ce(1), three equivalent Ir(1), and six equivalent Ir(2) atoms to form distorted IrCe3Ir9 cuboctahedra that share corners with eighteen equivalent Ir(2)Ce3Ir9 cuboctahedra, corners with three equivalent Ir(1)Ce4Ir12 tetrahedra, edges with six equivalent Ir(2)Ce3Ir9 cuboctahedra, faces with eighteen equivalent Ir(2)Ce3Ir9 cuboctahedra, and faces with seven equivalent Ir(1)Ce4Ir12 tetrahedra. There are three shorter (2.61 Å) and three longer (2.65 Å) Ir(2)-Ir(2) bond lengths.