W9Al3CoC3 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 2-coordinate geometry to one Co(1), three equivalent Al(1), and two equivalent C(1) atoms. In the second W site, W(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Al(1) and two equivalent C(1) atoms. Co(1) is bonded to six equivalent W(1) and six equivalent Al(1) atoms to form CoAl6W6 cuboctahedra that share edges with six equivalent C(1)W6 octahedra, faces with two equivalent Co(1)Al6W6 cuboctahedra, and faces with six equivalent Al(1)Al2Co2W8 cuboctahedra. Al(1) is bonded to two equivalent W(2), six equivalent W(1), two equivalent Co(1), and two equivalent Al(1) atoms to form distorted AlAl2Co2W8 cuboctahedra that share corners with four equivalent Al(1)Al2Co2W8 cuboctahedra, corners with four equivalent C(1)W6 octahedra, faces with two equivalent Co(1)Al6W6 cuboctahedra, faces with six equivalent Al(1)Al2Co2W8 cuboctahedra, and faces with four equivalent C(1)W6 octahedra. The corner-sharing octahedral tilt angles are 39°. C(1) is bonded to two equivalent W(2) and four equivalent W(1) atoms to form CW6 octahedra that share corners with four equivalent Al(1)Al2Co2W8 cuboctahedra, corners with six equivalent C(1)W6 octahedra, edges with two equivalent Co(1)Al6W6 cuboctahedra, and faces with four equivalent Al(1)Al2Co2W8 cuboctahedra. The corner-sharing octahedral tilt angles range from 40-46°.
W9Al3CoC3 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 2-coordinate geometry to one Co(1), three equivalent Al(1), and two equivalent C(1) atoms. The W(1)-Co(1) bond length is 2.85 Å. There are two shorter (2.80 Å) and one longer (2.83 Å) W(1)-Al(1) bond length. Both W(1)-C(1) bond lengths are 2.16 Å. In the second W site, W(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Al(1) and two equivalent C(1) atoms. Both W(2)-Al(1) bond lengths are 2.66 Å. Both W(2)-C(1) bond lengths are 2.09 Å. Co(1) is bonded to six equivalent W(1) and six equivalent Al(1) atoms to form CoAl6W6 cuboctahedra that share edges with six equivalent C(1)W6 octahedra, faces with two equivalent Co(1)Al6W6 cuboctahedra, and faces with six equivalent Al(1)Al2Co2W8 cuboctahedra. All Co(1)-Al(1) bond lengths are 2.48 Å. Al(1) is bonded to two equivalent W(2), six equivalent W(1), two equivalent Co(1), and two equivalent Al(1) atoms to form distorted AlAl2Co2W8 cuboctahedra that share corners with four equivalent Al(1)Al2Co2W8 cuboctahedra, corners with four equivalent C(1)W6 octahedra, faces with two equivalent Co(1)Al6W6 cuboctahedra, faces with six equivalent Al(1)Al2Co2W8 cuboctahedra, and faces with four equivalent C(1)W6 octahedra. The corner-sharing octahedral tilt angles are 39°. Both Al(1)-Al(1) bond lengths are 2.63 Å. C(1) is bonded to two equivalent W(2) and four equivalent W(1) atoms to form CW6 octahedra that share corners with four equivalent Al(1)Al2Co2W8 cuboctahedra, corners with six equivalent C(1)W6 octahedra, edges with two equivalent Co(1)Al6W6 cuboctahedra, and faces with four equivalent Al(1)Al2Co2W8 cuboctahedra. The corner-sharing octahedral tilt angles range from 40-46°.