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PmAu3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pm3+ is bonded to twelve equivalent Au1- atoms to form a mixture of corner and face-sharing PmAu12 cuboctahedra. There are six shorter (3.12 Å) and six longer (3.22 Å) Pm–Au bond lengths. Au1- is bonded in a distorted rectangular see-saw-like geometry to four equivalent Pm3+ atoms.
Pm3Au crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pm is bonded in a distorted see-saw-like geometry to four equivalent Au atoms. There are two shorter (3.28 Å) and two longer (3.50 Å) Pm–Au bond lengths. Au is bonded to twelve equivalent Pm atoms to form a mixture of face and corner-sharing AuPm12 cuboctahedra.
PmAu3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Pm3+ is bonded in a distorted body-centered cubic geometry to fourteen Au1- atoms. There are eight shorter (3.05 Å) and six longer (3.52 Å) Pm–Au bond lengths. There are two inequivalent Au1- sites. In the first Au1- site, Au1- is bonded to four equivalent Pm3+ and four equivalent Au1- atoms to form a mixture of distorted face, edge, and corner-sharing AuPm4Au4 tetrahedra. All Au–Au bond lengths are 3.05 Å. In the second Au1- site, Au1- is bonded in a 8-coordinate geometry to six equivalent Pm3+ and eight equivalent Au1- atoms.