Ho3(CoIn2)2 crystallizes in the hexagonal P-6 space group. Ho(1) is bonded in a 10-coordinate geometry to one Co(2), two equivalent Co(1), one In(1), and six equivalent In(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 6-coordinate geometry to six equivalent Ho(1) and three equivalent In(2) atoms. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to three equivalent Ho(1) and six equivalent In(2) atoms. There are two inequivalent In sites. In the first In site, In(1) is bonded in a trigonal planar geometry to three equivalent Ho(1) and six equivalent In(2) atoms. In the second In site, In(2) is bonded in a 11-coordinate geometry to six equivalent Ho(1), one Co(1), two equivalent Co(2), and two equivalent In(1) atoms.
Ho3(CoIn2)2 crystallizes in the hexagonal P-6 space group. Ho(1) is bonded in a 10-coordinate geometry to one Co(2), two equivalent Co(1), one In(1), and six equivalent In(2) atoms. The Ho(1)-Co(2) bond length is 3.08 Å. Both Ho(1)-Co(1) bond lengths are 2.73 Å. The Ho(1)-In(1) bond length is 3.04 Å. There are a spread of Ho(1)-In(2) bond distances ranging from 3.18-3.47 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 6-coordinate geometry to six equivalent Ho(1) and three equivalent In(2) atoms. All Co(1)-In(2) bond lengths are 3.21 Å. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to three equivalent Ho(1) and six equivalent In(2) atoms. All Co(2)-In(2) bond lengths are 2.83 Å. There are two inequivalent In sites. In the first In site, In(1) is bonded in a trigonal planar geometry to three equivalent Ho(1) and six equivalent In(2) atoms. All In(1)-In(2) bond lengths are 3.30 Å. In the second In site, In(2) is bonded in a 11-coordinate geometry to six equivalent Ho(1), one Co(1), two equivalent Co(2), and two equivalent In(1) atoms.