Hf9Re4Co crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 5-coordinate geometry to one Re(2), three equivalent Re(1), and one Co(1) atom. In the second Hf site, Hf(2) is bonded in a 3-coordinate geometry to two equivalent Re(1) and one Co(1) atom. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded in a 12-coordinate geometry to two equivalent Hf(2), six equivalent Hf(1), two equivalent Re(1), and two equivalent Re(2) atoms. In the second Re site, Re(2) is bonded to six equivalent Hf(1) and six equivalent Re(1) atoms to form face-sharing ReHf6Re6 cuboctahedra. Co(1) is bonded in a 9-coordinate geometry to three equivalent Hf(2) and six equivalent Hf(1) atoms.
Hf9Re4Co crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 5-coordinate geometry to one Re(2), three equivalent Re(1), and one Co(1) atom. The Hf(1)-Re(2) bond length is 3.00 Å. There is one shorter (2.92 Å) and two longer (3.04 Å) Hf(1)-Re(1) bond lengths. The Hf(1)-Co(1) bond length is 2.57 Å. In the second Hf site, Hf(2) is bonded in a 3-coordinate geometry to two equivalent Re(1) and one Co(1) atom. Both Hf(2)-Re(1) bond lengths are 2.87 Å. The Hf(2)-Co(1) bond length is 3.08 Å. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded in a 12-coordinate geometry to two equivalent Hf(2), six equivalent Hf(1), two equivalent Re(1), and two equivalent Re(2) atoms. Both Re(1)-Re(1) bond lengths are 2.85 Å. Both Re(1)-Re(2) bond lengths are 2.68 Å. In the second Re site, Re(2) is bonded to six equivalent Hf(1) and six equivalent Re(1) atoms to form face-sharing ReHf6Re6 cuboctahedra. Co(1) is bonded in a 9-coordinate geometry to three equivalent Hf(2) and six equivalent Hf(1) atoms.