PuAl4 crystallizes in the monoclinic C2/m space group. Pu(1) is bonded in a 13-coordinate geometry to two equivalent Al(2), two equivalent Al(3), three equivalent Al(1), three equivalent Al(4), and three equivalent Al(5) atoms. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a 13-coordinate geometry to three equivalent Pu(1), two equivalent Al(2), two equivalent Al(3), three equivalent Al(4), and three equivalent Al(5) atoms. In the second Al site, Al(2) is bonded to four equivalent Pu(1), two equivalent Al(4), and four equivalent Al(1) atoms to form distorted face-sharing AlPu4Al6 cuboctahedra. In the third Al site, Al(3) is bonded in a 6-coordinate geometry to four equivalent Pu(1), two equivalent Al(5), and four equivalent Al(1) atoms. In the fourth Al site, Al(4) is bonded in a 10-coordinate geometry to three equivalent Pu(1), one Al(2), three equivalent Al(1), and three equivalent Al(5) atoms. In the fifth Al site, Al(5) is bonded in a 10-coordinate geometry to three equivalent Pu(1), one Al(3), three equivalent Al(1), and three equivalent Al(4) atoms.
PuAl4 crystallizes in the monoclinic C2/m space group. Pu(1) is bonded in a 13-coordinate geometry to two equivalent Al(2), two equivalent Al(3), three equivalent Al(1), three equivalent Al(4), and three equivalent Al(5) atoms. Both Pu(1)-Al(2) bond lengths are 3.10 Å. Both Pu(1)-Al(3) bond lengths are 3.10 Å. There are two shorter (3.11 Å) and one longer (3.12 Å) Pu(1)-Al(1) bond length. There are two shorter (3.04 Å) and one longer (3.13 Å) Pu(1)-Al(4) bond length. There are two shorter (3.03 Å) and one longer (3.13 Å) Pu(1)-Al(5) bond length. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a 13-coordinate geometry to three equivalent Pu(1), two equivalent Al(2), two equivalent Al(3), three equivalent Al(4), and three equivalent Al(5) atoms. Both Al(1)-Al(2) bond lengths are 3.11 Å. Both Al(1)-Al(3) bond lengths are 3.12 Å. There are two shorter (2.83 Å) and one longer (2.91 Å) Al(1)-Al(4) bond length. There are two shorter (2.83 Å) and one longer (2.92 Å) Al(1)-Al(5) bond length. In the second Al site, Al(2) is bonded to four equivalent Pu(1), two equivalent Al(4), and four equivalent Al(1) atoms to form distorted face-sharing AlPu4Al6 cuboctahedra. Both Al(2)-Al(4) bond lengths are 2.72 Å. In the third Al site, Al(3) is bonded in a 6-coordinate geometry to four equivalent Pu(1), two equivalent Al(5), and four equivalent Al(1) atoms. Both Al(3)-Al(5) bond lengths are 2.71 Å. In the fourth Al site, Al(4) is bonded in a 10-coordinate geometry to three equivalent Pu(1), one Al(2), three equivalent Al(1), and three equivalent Al(5) atoms. There are two shorter (2.62 Å) and one longer (2.75 Å) Al(4)-Al(5) bond length. In the fifth Al site, Al(5) is bonded in a 10-coordinate geometry to three equivalent Pu(1), one Al(3), three equivalent Al(1), and three equivalent Al(4) atoms.