Lu8CoIn3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent In(1) atoms. In the second Lu site, Lu(2) is bonded in a 4-coordinate geometry to one Co(1) and four equivalent In(1) atoms. In the third Lu site, Lu(3) is bonded to one Co(1) and three equivalent In(1) atoms to form distorted corner-sharing LuIn3Co tetrahedra. The corner-sharing octahedral tilt angles range from 14-47°. In the fourth Lu site, Lu(4) is bonded to six equivalent In(1) atoms to form distorted LuIn6 octahedra that share corners with six equivalent Lu(3)In3Co tetrahedra and faces with two equivalent Lu(4)In6 octahedra. Co(1) is bonded in a 7-coordinate geometry to one Lu(3), three equivalent Lu(1), and three equivalent Lu(2) atoms. In(1) is bonded in a 11-coordinate geometry to one Lu(3), two equivalent Lu(4), four equivalent Lu(1), and four equivalent Lu(2) atoms.
Lu8CoIn3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent In(1) atoms. The Lu(1)-Co(1) bond length is 2.82 Å. There are two shorter (3.20 Å) and two longer (3.72 Å) Lu(1)-In(1) bond lengths. In the second Lu site, Lu(2) is bonded in a 4-coordinate geometry to one Co(1) and four equivalent In(1) atoms. The Lu(2)-Co(1) bond length is 2.75 Å. There are a spread of Lu(2)-In(1) bond distances ranging from 3.03-3.70 Å. In the third Lu site, Lu(3) is bonded to one Co(1) and three equivalent In(1) atoms to form distorted corner-sharing LuIn3Co tetrahedra. The corner-sharing octahedral tilt angles range from 14-47°. The Lu(3)-Co(1) bond length is 2.64 Å. All Lu(3)-In(1) bond lengths are 3.14 Å. In the fourth Lu site, Lu(4) is bonded to six equivalent In(1) atoms to form distorted LuIn6 octahedra that share corners with six equivalent Lu(3)In3Co tetrahedra and faces with two equivalent Lu(4)In6 octahedra. There are three shorter (3.30 Å) and three longer (3.40 Å) Lu(4)-In(1) bond lengths. Co(1) is bonded in a 7-coordinate geometry to one Lu(3), three equivalent Lu(1), and three equivalent Lu(2) atoms. In(1) is bonded in a 11-coordinate geometry to one Lu(3), two equivalent Lu(4), four equivalent Lu(1), and four equivalent Lu(2) atoms.