Be13Pu crystallizes in the orthorhombic Ibam space group. There are five inequivalent Be sites. In the first Be site, Be(1) is bonded to two equivalent Be(3), two equivalent Be(4), four equivalent Be(2), and four equivalent Be(5) atoms to form a mixture of corner and face-sharing BeBe12 cuboctahedra. In the second Be site, Be(2) is bonded to one Be(1), one Be(2), two equivalent Be(3), two equivalent Be(4), four equivalent Be(5), and two equivalent Pu(1) atoms to form distorted BePu2Be10 cuboctahedra that share  a cornercorner with one Be(1)Be12 cuboctahedra, corners with three equivalent Be(3)Pu2Be10 cuboctahedra, corners with three equivalent Be(4)Pu2Be10 cuboctahedra, corners with ten equivalent Be(5)Pu2Be10 cuboctahedra, corners with eleven equivalent Be(2)Pu2Be10 cuboctahedra, edges with two equivalent Be(5)Pu2Be10 cuboctahedra, edges with three equivalent Be(3)Pu2Be10 cuboctahedra, edges with three equivalent Be(4)Pu2Be10 cuboctahedra, faces with two equivalent Be(1)Be12 cuboctahedra, faces with three equivalent Be(3)Pu2Be10 cuboctahedra, faces with three equivalent Be(4)Pu2Be10 cuboctahedra, faces with eight equivalent Be(5)Pu2Be10 cuboctahedra, and faces with nine equivalent Be(2)Pu2Be10 cuboctahedra. In the third Be site, Be(3) is bonded to one Be(1), two equivalent Be(5), three equivalent Be(4), four equivalent Be(2), and two equivalent Pu(1) atoms to form distorted BePu2Be10 cuboctahedra that share  a cornercorner with one Be(1)Be12 cuboctahedra, corners with four equivalent Be(4)Pu2Be10 cuboctahedra, corners with six equivalent Be(2)Pu2Be10 cuboctahedra, corners with seven equivalent Be(3)Pu2Be10 cuboctahedra, corners with ten equivalent Be(5)Pu2Be10 cuboctahedra, edges with two equivalent Be(5)Pu2Be10 cuboctahedra, edges with six equivalent Be(2)Pu2Be10 cuboctahedra, faces with two equivalent Be(1)Be12 cuboctahedra, faces with three equivalent Be(3)Pu2Be10 cuboctahedra, faces with four equivalent Be(4)Pu2Be10 cuboctahedra, faces with six equivalent Be(2)Pu2Be10 cuboctahedra, and faces with ten equivalent Be(5)Pu2Be10 cuboctahedra. In the fourth Be site, Be(4) is bonded to one Be(1), two equivalent Be(5), three equivalent Be(3), four equivalent Be(2), and two equivalent Pu(1) atoms to form distorted BePu2Be10 cuboctahedra that share  a cornercorner with one Be(1)Be12 cuboctahedra, corners with four equivalent Be(3)Pu2Be10 cuboctahedra, corners with six equivalent Be(2)Pu2Be10 cuboctahedra, corners with seven equivalent Be(4)Pu2Be10 cuboctahedra, corners with ten equivalent Be(5)Pu2Be10 cuboctahedra, edges with two equivalent Be(5)Pu2Be10 cuboctahedra, edges with six equivalent Be(2)Pu2Be10 cuboctahedra, faces with two equivalent Be(1)Be12 cuboctahedra, faces with three equivalent Be(4)Pu2Be10 cuboctahedra, faces with four equivalent Be(3)Pu2Be10 cuboctahedra, faces with six equivalent Be(2)Pu2Be10 cuboctahedra, and faces with ten equivalent Be(5)Pu2Be10 cuboctahedra. In the fifth Be site, Be(5) is bonded to one Be(1), one Be(3), one Be(4), three equivalent Be(5), four equivalent Be(2), and two equivalent Pu(1) atoms to form distorted BePu2Be10 cuboctahedra that share  a cornercorner with one Be(1)Be12 cuboctahedra, corners with five equivalent Be(3)Pu2Be10 cuboctahedra, corners with five equivalent Be(4)Pu2Be10 cuboctahedra, corners with seven equivalent Be(5)Pu2Be10 cuboctahedra, corners with ten equivalent Be(2)Pu2Be10 cuboctahedra,  an edgeedge with one Be(3)Pu2Be10 cuboctahedra,  an edgeedge with one Be(4)Pu2Be10 cuboctahedra, edges with two equivalent Be(2)Pu2Be10 cuboctahedra, edges with four equivalent Be(5)Pu2Be10 cuboctahedra, faces with two equivalent Be(1)Be12 cuboctahedra, faces with five equivalent Be(3)Pu2Be10 cuboctahedra, faces with five equivalent Be(4)Pu2Be10 cuboctahedra, faces with five equivalent Be(5)Pu2Be10 cuboctahedra, and faces with eight equivalent Be(2)Pu2Be10 cuboctahedra. Pu(1) is bonded in a 24-coordinate geometry to four equivalent Be(3), four equivalent Be(4), eight equivalent Be(2), and eight equivalent Be(5) atoms.
Be13Pu crystallizes in the orthorhombic Ibam space group. There are five inequivalent Be sites. In the first Be site, Be(1) is bonded to two equivalent Be(3), two equivalent Be(4), four equivalent Be(2), and four equivalent Be(5) atoms to form a mixture of corner and face-sharing BeBe12 cuboctahedra. Both Be(1)-Be(3) bond lengths are 2.15 Å. Both Be(1)-Be(4) bond lengths are 2.15 Å. All Be(1)-Be(2) bond lengths are 2.15 Å. All Be(1)-Be(5) bond lengths are 2.15 Å. In the second Be site, Be(2) is bonded to one Be(1), one Be(2), two equivalent Be(3), two equivalent Be(4), four equivalent Be(5), and two equivalent Pu(1) atoms to form distorted BePu2Be10 cuboctahedra that share  a cornercorner with one Be(1)Be12 cuboctahedra, corners with three equivalent Be(3)Pu2Be10 cuboctahedra, corners with three equivalent Be(4)Pu2Be10 cuboctahedra, corners with ten equivalent Be(5)Pu2Be10 cuboctahedra, corners with eleven equivalent Be(2)Pu2Be10 cuboctahedra, edges with two equivalent Be(5)Pu2Be10 cuboctahedra, edges with three equivalent Be(3)Pu2Be10 cuboctahedra, edges with three equivalent Be(4)Pu2Be10 cuboctahedra, faces with two equivalent Be(1)Be12 cuboctahedra, faces with three equivalent Be(3)Pu2Be10 cuboctahedra, faces with three equivalent Be(4)Pu2Be10 cuboctahedra, faces with eight equivalent Be(5)Pu2Be10 cuboctahedra, and faces with nine equivalent Be(2)Pu2Be10 cuboctahedra. The Be(2)-Be(2) bond length is 2.33 Å. Both Be(2)-Be(3) bond lengths are 2.24 Å. Both Be(2)-Be(4) bond lengths are 2.24 Å. There are three shorter (2.24 Å) and one longer (2.25 Å) Be(2)-Be(5) bond length. There is one shorter (3.01 Å) and one longer (3.02 Å) Be(2)-Pu(1) bond length. In the third Be site, Be(3) is bonded to one Be(1), two equivalent Be(5), three equivalent Be(4), four equivalent Be(2), and two equivalent Pu(1) atoms to form distorted BePu2Be10 cuboctahedra that share  a cornercorner with one Be(1)Be12 cuboctahedra, corners with four equivalent Be(4)Pu2Be10 cuboctahedra, corners with six equivalent Be(2)Pu2Be10 cuboctahedra, corners with seven equivalent Be(3)Pu2Be10 cuboctahedra, corners with ten equivalent Be(5)Pu2Be10 cuboctahedra, edges with two equivalent Be(5)Pu2Be10 cuboctahedra, edges with six equivalent Be(2)Pu2Be10 cuboctahedra, faces with two equivalent Be(1)Be12 cuboctahedra, faces with three equivalent Be(3)Pu2Be10 cuboctahedra, faces with four equivalent Be(4)Pu2Be10 cuboctahedra, faces with six equivalent Be(2)Pu2Be10 cuboctahedra, and faces with ten equivalent Be(5)Pu2Be10 cuboctahedra. Both Be(3)-Be(5) bond lengths are 2.24 Å. There are two shorter (2.24 Å) and one longer (2.34 Å) Be(3)-Be(4) bond length. Both Be(3)-Pu(1) bond lengths are 3.01 Å. In the fourth Be site, Be(4) is bonded to one Be(1), two equivalent Be(5), three equivalent Be(3), four equivalent Be(2), and two equivalent Pu(1) atoms to form distorted BePu2Be10 cuboctahedra that share  a cornercorner with one Be(1)Be12 cuboctahedra, corners with four equivalent Be(3)Pu2Be10 cuboctahedra, corners with six equivalent Be(2)Pu2Be10 cuboctahedra, corners with seven equivalent Be(4)Pu2Be10 cuboctahedra, corners with ten equivalent Be(5)Pu2Be10 cuboctahedra, edges with two equivalent Be(5)Pu2Be10 cuboctahedra, edges with six equivalent Be(2)Pu2Be10 cuboctahedra, faces with two equivalent Be(1)Be12 cuboctahedra, faces with three equivalent Be(4)Pu2Be10 cuboctahedra, faces with four equivalent Be(3)Pu2Be10 cuboctahedra, faces with six equivalent Be(2)Pu2Be10 cuboctahedra, and faces with ten equivalent Be(5)Pu2Be10 cuboctahedra. Both Be(4)-Be(5) bond lengths are 2.24 Å. Both Be(4)-Pu(1) bond lengths are 3.01 Å. In the fifth Be site, Be(5) is bonded to one Be(1), one Be(3), one Be(4), three equivalent Be(5), four equivalent Be(2), and two equivalent Pu(1) atoms to form distorted BePu2Be10 cuboctahedra that share  a cornercorner with one Be(1)Be12 cuboctahedra, corners with five equivalent Be(3)Pu2Be10 cuboctahedra, corners with five equivalent Be(4)Pu2Be10 cuboctahedra, corners with seven equivalent Be(5)Pu2Be10 cuboctahedra, corners with ten equivalent Be(2)Pu2Be10 cuboctahedra,  an edgeedge with one Be(3)Pu2Be10 cuboctahedra,  an edgeedge with one Be(4)Pu2Be10 cuboctahedra, edges with two equivalent Be(2)Pu2Be10 cuboctahedra, edges with four equivalent Be(5)Pu2Be10 cuboctahedra, faces with two equivalent Be(1)Be12 cuboctahedra, faces with five equivalent Be(3)Pu2Be10 cuboctahedra, faces with five equivalent Be(4)Pu2Be10 cuboctahedra, faces with five equivalent Be(5)Pu2Be10 cuboctahedra, and faces with eight equivalent Be(2)Pu2Be10 cuboctahedra. There are two shorter (2.24 Å) and one longer (2.34 Å) Be(5)-Be(5) bond length. Both Be(5)-Pu(1) bond lengths are 3.01 Å. Pu(1) is bonded in a 24-coordinate geometry to four equivalent Be(3), four equivalent Be(4), eight equivalent Be(2), and eight equivalent Be(5) atoms.