IrCo crystallizes in the trigonal R-3m space group. Ir(1) is bonded to six equivalent Ir(1) and six equivalent Co(1) atoms to form distorted IrCo6Ir6 cuboctahedra that share corners with twelve equivalent Ir(1)Co6Ir6 cuboctahedra, edges with twelve equivalent Ir(1)Co6Ir6 cuboctahedra, edges with twelve equivalent Co(1)Co6Ir6 cuboctahedra, faces with six equivalent Ir(1)Co6Ir6 cuboctahedra, and faces with twelve equivalent Co(1)Co6Ir6 cuboctahedra. Co(1) is bonded to six equivalent Ir(1) and six equivalent Co(1) atoms to form distorted CoCo6Ir6 cuboctahedra that share corners with twelve equivalent Co(1)Co6Ir6 cuboctahedra, edges with twelve equivalent Ir(1)Co6Ir6 cuboctahedra, edges with twelve equivalent Co(1)Co6Ir6 cuboctahedra, faces with six equivalent Co(1)Co6Ir6 cuboctahedra, and faces with twelve equivalent Ir(1)Co6Ir6 cuboctahedra.
IrCo crystallizes in the trigonal R-3m space group. Ir(1) is bonded to six equivalent Ir(1) and six equivalent Co(1) atoms to form distorted IrCo6Ir6 cuboctahedra that share corners with twelve equivalent Ir(1)Co6Ir6 cuboctahedra, edges with twelve equivalent Ir(1)Co6Ir6 cuboctahedra, edges with twelve equivalent Co(1)Co6Ir6 cuboctahedra, faces with six equivalent Ir(1)Co6Ir6 cuboctahedra, and faces with twelve equivalent Co(1)Co6Ir6 cuboctahedra. All Ir(1)-Ir(1) bond lengths are 2.65 Å. All Ir(1)-Co(1) bond lengths are 2.58 Å. Co(1) is bonded to six equivalent Ir(1) and six equivalent Co(1) atoms to form distorted CoCo6Ir6 cuboctahedra that share corners with twelve equivalent Co(1)Co6Ir6 cuboctahedra, edges with twelve equivalent Ir(1)Co6Ir6 cuboctahedra, edges with twelve equivalent Co(1)Co6Ir6 cuboctahedra, faces with six equivalent Co(1)Co6Ir6 cuboctahedra, and faces with twelve equivalent Ir(1)Co6Ir6 cuboctahedra. All Co(1)-Co(1) bond lengths are 2.65 Å.