PrAgAl2 crystallizes in the trigonal R-3m space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 12-coordinate geometry to three equivalent Ag(2) and nine equivalent Al(1) atoms. In the second Pr site, Pr(2) is bonded in a distorted hexagonal planar geometry to six equivalent Ag(1) and twelve equivalent Al(1) atoms. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 9-coordinate geometry to three equivalent Pr(2) and six equivalent Al(1) atoms. In the second Ag site, Ag(2) is bonded to six equivalent Pr(1) and six equivalent Al(1) atoms to form edge-sharing AgPr6Al6 cuboctahedra. Al(1) is bonded in a 12-coordinate geometry to two equivalent Pr(2), three equivalent Pr(1), one Ag(2), two equivalent Ag(1), and four equivalent Al(1) atoms.
PrAgAl2 crystallizes in the trigonal R-3m space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 12-coordinate geometry to three equivalent Ag(2) and nine equivalent Al(1) atoms. All Pr(1)-Ag(2) bond lengths are 3.33 Å. There are six shorter (3.26 Å) and three longer (3.35 Å) Pr(1)-Al(1) bond lengths. In the second Pr site, Pr(2) is bonded in a distorted hexagonal planar geometry to six equivalent Ag(1) and twelve equivalent Al(1) atoms. All Pr(2)-Ag(1) bond lengths are 3.27 Å. All Pr(2)-Al(1) bond lengths are 3.59 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 9-coordinate geometry to three equivalent Pr(2) and six equivalent Al(1) atoms. There are three shorter (2.72 Å) and three longer (2.77 Å) Ag(1)-Al(1) bond lengths. In the second Ag site, Ag(2) is bonded to six equivalent Pr(1) and six equivalent Al(1) atoms to form edge-sharing AgPr6Al6 cuboctahedra. All Ag(2)-Al(1) bond lengths are 2.82 Å. Al(1) is bonded in a 12-coordinate geometry to two equivalent Pr(2), three equivalent Pr(1), one Ag(2), two equivalent Ag(1), and four equivalent Al(1) atoms. There are two shorter (2.79 Å) and two longer (2.87 Å) Al(1)-Al(1) bond lengths.