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PrCl3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Pr3+ is bonded in a 9-coordinate geometry to nine equivalent Cl1- atoms. There are six shorter (2.93 Å) and three longer (2.97 Å) Pr–Cl bond lengths. Cl1- is bonded in a trigonal non-coplanar geometry to three equivalent Pr3+ atoms.
Pr5Cl12 crystallizes in the trigonal P-3 space group. The structure is three-dimensional. there are eight inequivalent Pr sites. In the first Pr site, Pr is bonded in a 9-coordinate geometry to nine Cl atoms. There are a spread of Pr–Cl bond distances ranging from 2.85–3.21 Å. In the second Pr site, Pr is bonded in a 9-coordinate geometry to nine Cl atoms. There are six shorter (2.86 Å) and three longer (3.31 Å) Pr–Cl bond lengths. In the third Pr site, Pr is bonded in a 9-coordinate geometry to nine Cl atoms. There are a spread of Pr–Cl bond distances ranging from 2.84–3.29 Å. In the fourth Pr site, Pr is bonded in a 9-coordinate geometry to nine Cl atoms. There are a spread of Pr–Cl bond distances ranging from 2.83–3.27 Å. In the fifth Pr site, Pr is bonded in a 9-coordinate geometry to nine Cl atoms. There are a spread of Pr–Cl bond distances ranging from 2.90–3.17 Å. In the sixth Pr site, Pr is bonded in a distorted hexagonal planar geometry to six Cl atoms. There are three shorter (2.95 Å) and three longer (3.03 Å) Pr–Cl bond lengths. In the seventh Pr site, Pr is bonded in a 9-coordinate geometry to nine Cl atoms. There are a spread of Pr–Cl bond distances ranging from 2.93–3.19 Å. In the eighth Pr site, Pr is bonded in a 6-coordinate geometry to six equivalent Cl atoms. All Pr–Cl bond lengths are 3.00 Å. There are six inequivalent Cl sites. In the first Cl site, Cl is bonded in a distorted trigonal non-coplanar geometry to three Pr atoms. In the second Cl site, Cl is bonded in a distorted trigonal non-coplanar geometry to three Pr atoms. In the third Cl site, Cl is bonded in a distorted trigonal non-coplanar geometry to three Pr atoms. In the fourth Cl site, Cl is bonded to four Pr atoms to form a mixture of distorted corner and edge-sharing ClPr4 tetrahedra. In the fifth Cl site, Cl is bonded to four Pr atoms to form a mixture of distorted corner and edge-sharing ClPr4 tetrahedra. In the sixth Cl site, Cl is bonded to four Pr atoms to form a mixture of distorted corner and edge-sharing ClPr4 tetrahedra.
Pr3Cl crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pr is bonded in a see-saw-like geometry to four equivalent Cl atoms. There are two shorter (3.48 Å) and two longer (3.52 Å) Pr–Cl bond lengths. Cl is bonded to twelve equivalent Pr atoms to form a mixture of face and corner-sharing ClPr12 cuboctahedra.