Y8CoIn3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent In(1) atoms. In the second Y site, Y(2) is bonded in a 4-coordinate geometry to one Co(1) and four equivalent In(1) atoms. In the third Y site, Y(3) is bonded to one Co(1) and three equivalent In(1) atoms to form distorted corner-sharing YIn3Co tetrahedra. The corner-sharing octahedral tilt angles range from 14-48°. In the fourth Y site, Y(4) is bonded to six equivalent In(1) atoms to form distorted YIn6 octahedra that share corners with six equivalent Y(3)In3Co tetrahedra and faces with two equivalent Y(4)In6 octahedra. Co(1) is bonded in a 7-coordinate geometry to one Y(3), three equivalent Y(1), and three equivalent Y(2) atoms. In(1) is bonded in a 11-coordinate geometry to one Y(3), two equivalent Y(4), four equivalent Y(1), and four equivalent Y(2) atoms.
Y8CoIn3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent In(1) atoms. The Y(1)-Co(1) bond length is 2.85 Å. There are two shorter (3.28 Å) and two longer (3.83 Å) Y(1)-In(1) bond lengths. In the second Y site, Y(2) is bonded in a 4-coordinate geometry to one Co(1) and four equivalent In(1) atoms. The Y(2)-Co(1) bond length is 2.85 Å. There are a spread of Y(2)-In(1) bond distances ranging from 3.08-3.84 Å. In the third Y site, Y(3) is bonded to one Co(1) and three equivalent In(1) atoms to form distorted corner-sharing YIn3Co tetrahedra. The corner-sharing octahedral tilt angles range from 14-48°. The Y(3)-Co(1) bond length is 2.74 Å. All Y(3)-In(1) bond lengths are 3.22 Å. In the fourth Y site, Y(4) is bonded to six equivalent In(1) atoms to form distorted YIn6 octahedra that share corners with six equivalent Y(3)In3Co tetrahedra and faces with two equivalent Y(4)In6 octahedra. There are three shorter (3.39 Å) and three longer (3.47 Å) Y(4)-In(1) bond lengths. Co(1) is bonded in a 7-coordinate geometry to one Y(3), three equivalent Y(1), and three equivalent Y(2) atoms. In(1) is bonded in a 11-coordinate geometry to one Y(3), two equivalent Y(4), four equivalent Y(1), and four equivalent Y(2) atoms.