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HoCl2 is zeta iron carbide structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Ho is bonded to six equivalent Cl atoms to form a mixture of corner and edge-sharing HoCl6 octahedra. The corner-sharing octahedral tilt angles are 39°. There are two shorter (2.73 Å) and four longer (2.75 Å) Ho–Cl bond lengths. Cl is bonded in a 3-coordinate geometry to three equivalent Ho atoms.
HoCl3 crystallizes in the hexagonal P6_3/mmc space group. The structure is one-dimensional and consists of two HoCl3 ribbons oriented in the (0, 0, 1) direction. Ho3+ is bonded to six equivalent Cl1- atoms to form distorted face-sharing HoCl6 pentagonal pyramids. All Ho–Cl bond lengths are 2.66 Å. Cl1- is bonded in an L-shaped geometry to two equivalent Ho3+ atoms.
Ho5Cl11 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are six inequivalent Ho sites. In the first Ho site, Ho is bonded in a 7-coordinate geometry to seven Cl atoms. There are a spread of Ho–Cl bond distances ranging from 2.68–3.13 Å. In the second Ho site, Ho is bonded to seven Cl atoms to form distorted edge-sharing HoCl7 pentagonal bipyramids. There are a spread of Ho–Cl bond distances ranging from 2.63–2.93 Å. In the third Ho site, Ho is bonded in a 6-coordinate geometry to seven Cl atoms. There are a spread of Ho–Cl bond distances ranging from 2.62–3.30 Å. In the fourth Ho site, Ho is bonded in a 8-coordinate geometry to eight Cl atoms. There are a spread of Ho–Cl bond distances ranging from 2.61–3.01 Å. In the fifth Ho site, Ho is bonded in a 7-coordinate geometry to seven Cl atoms. There are a spread of Ho–Cl bond distances ranging from 2.65–3.21 Å. In the sixth Ho site, Ho is bonded in a 8-coordinate geometry to eight Cl atoms. There are a spread of Ho–Cl bond distances ranging from 2.65–2.97 Å. There are twelve inequivalent Cl sites. In the first Cl site, Cl is bonded in a distorted trigonal planar geometry to three Ho atoms. In the second Cl site, Cl is bonded to four Ho atoms to form distorted corner-sharing ClHo4 trigonal pyramids. In the third Cl site, Cl is bonded in a distorted bent 150 degrees geometry to two Ho atoms. In the fourth Cl site, Cl is bonded in a 3-coordinate geometry to three Ho atoms. In the fifth Cl site, Cl is bonded in a distorted trigonal non-coplanar geometry to three Ho atoms. In the sixth Cl site, Cl is bonded in a distorted rectangular see-saw-like geometry to four Ho atoms. In the seventh Cl site, Cl is bonded in a 3-coordinate geometry to three Ho atoms. In the eighth Cl site, Cl is bonded in a trigonal planar geometry to three Ho atoms. In the ninth Cl site, Cl is bonded in a distorted T-shaped geometry to three Ho atoms. In the tenth Cl site, Cl is bonded to four Ho atoms to form a mixture of distorted edge and corner-sharing ClHo4 tetrahedra. In the eleventh Cl site, Cl is bonded in a bent 120 degrees geometry to two Ho atoms. In the twelfth Cl site, Cl is bonded in a distorted rectangular see-saw-like geometry to four Ho atoms.