CoOs crystallizes in the hexagonal P-6m2 space group. Os(1) is bonded to six equivalent Os(1) and six equivalent Co(1) atoms to form distorted OsCo6Os6 cuboctahedra that share corners with eighteen equivalent Os(1)Co6Os6 cuboctahedra, edges with six equivalent Os(1)Co6Os6 cuboctahedra, edges with twelve equivalent Co(1)Co6Os6 cuboctahedra, faces with eight equivalent Os(1)Co6Os6 cuboctahedra, and faces with twelve equivalent Co(1)Co6Os6 cuboctahedra. Co(1) is bonded to six equivalent Os(1) and six equivalent Co(1) atoms to form distorted CoCo6Os6 cuboctahedra that share corners with eighteen equivalent Co(1)Co6Os6 cuboctahedra, edges with six equivalent Co(1)Co6Os6 cuboctahedra, edges with twelve equivalent Os(1)Co6Os6 cuboctahedra, faces with eight equivalent Co(1)Co6Os6 cuboctahedra, and faces with twelve equivalent Os(1)Co6Os6 cuboctahedra.
CoOs crystallizes in the hexagonal P-6m2 space group. Os(1) is bonded to six equivalent Os(1) and six equivalent Co(1) atoms to form distorted OsCo6Os6 cuboctahedra that share corners with eighteen equivalent Os(1)Co6Os6 cuboctahedra, edges with six equivalent Os(1)Co6Os6 cuboctahedra, edges with twelve equivalent Co(1)Co6Os6 cuboctahedra, faces with eight equivalent Os(1)Co6Os6 cuboctahedra, and faces with twelve equivalent Co(1)Co6Os6 cuboctahedra. All Os(1)-Os(1) bond lengths are 2.67 Å. All Os(1)-Co(1) bond lengths are 2.57 Å. Co(1) is bonded to six equivalent Os(1) and six equivalent Co(1) atoms to form distorted CoCo6Os6 cuboctahedra that share corners with eighteen equivalent Co(1)Co6Os6 cuboctahedra, edges with six equivalent Co(1)Co6Os6 cuboctahedra, edges with twelve equivalent Os(1)Co6Os6 cuboctahedra, faces with eight equivalent Co(1)Co6Os6 cuboctahedra, and faces with twelve equivalent Os(1)Co6Os6 cuboctahedra. All Co(1)-Co(1) bond lengths are 2.67 Å.