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GdCl3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Gd3+ is bonded in a 9-coordinate geometry to nine equivalent Cl1- atoms. There are six shorter (2.82 Å) and three longer (3.00 Å) Gd–Cl bond lengths. Cl1- is bonded in a distorted trigonal non-coplanar geometry to three equivalent Gd3+ atoms.
Gd2Cl3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Gd sites. In the first Gd site, Gd is bonded in a 5-coordinate geometry to five Cl atoms. There are a spread of Gd–Cl bond distances ranging from 2.80–3.08 Å. In the second Gd site, Gd is bonded in a distorted pentagonal planar geometry to five Cl atoms. There are a spread of Gd–Cl bond distances ranging from 2.72–2.85 Å. There are three inequivalent Cl sites. In the first Cl site, Cl is bonded in a trigonal non-coplanar geometry to three equivalent Gd atoms. In the second Cl site, Cl is bonded in a rectangular see-saw-like geometry to four Gd atoms. In the third Cl site, Cl is bonded in a distorted T-shaped geometry to three Gd atoms.
GdCl crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. Gd is bonded in a 4-coordinate geometry to four equivalent Cl atoms. There are one shorter (2.75 Å) and three longer (2.92 Å) Gd–Cl bond lengths. Cl is bonded in a 4-coordinate geometry to four equivalent Gd atoms.