PuOsB4 crystallizes in the orthorhombic Pbam space group. Pu(1) is bonded in a 18-coordinate geometry to four equivalent Os(1), two equivalent B(3), four equivalent B(1), four equivalent B(2), and four equivalent B(4) atoms. Os(1) is bonded in a 15-coordinate geometry to four equivalent Pu(1), one Os(1), two equivalent B(1), two equivalent B(2), two equivalent B(4), and four equivalent B(3) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to four equivalent Pu(1), two equivalent Os(1), one B(2), and two equivalent B(4) atoms. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Pu(1), two equivalent Os(1), one B(1), one B(2), and one B(3) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to two equivalent Pu(1), four equivalent Os(1), one B(2), one B(3), and one B(4) atom. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to four equivalent Pu(1), two equivalent Os(1), one B(3), and two equivalent B(1) atoms.
PuOsB4 crystallizes in the orthorhombic Pbam space group. Pu(1) is bonded in a 18-coordinate geometry to four equivalent Os(1), two equivalent B(3), four equivalent B(1), four equivalent B(2), and four equivalent B(4) atoms. There are a spread of Pu(1)-Os(1) bond distances ranging from 2.99-3.15 Å. Both Pu(1)-B(3) bond lengths are 2.64 Å. There are two shorter (2.73 Å) and two longer (2.76 Å) Pu(1)-B(1) bond lengths. There are two shorter (2.74 Å) and two longer (2.75 Å) Pu(1)-B(2) bond lengths. There are two shorter (2.72 Å) and two longer (2.76 Å) Pu(1)-B(4) bond lengths. Os(1) is bonded in a 15-coordinate geometry to four equivalent Pu(1), one Os(1), two equivalent B(1), two equivalent B(2), two equivalent B(4), and four equivalent B(3) atoms. The Os(1)-Os(1) bond length is 2.71 Å. Both Os(1)-B(1) bond lengths are 2.26 Å. Both Os(1)-B(2) bond lengths are 2.34 Å. Both Os(1)-B(4) bond lengths are 2.33 Å. There are two shorter (2.39 Å) and two longer (2.40 Å) Os(1)-B(3) bond lengths. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to four equivalent Pu(1), two equivalent Os(1), one B(2), and two equivalent B(4) atoms. The B(1)-B(2) bond length is 1.87 Å. There is one shorter (1.79 Å) and one longer (1.89 Å) B(1)-B(4) bond length. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Pu(1), two equivalent Os(1), one B(1), one B(2), and one B(3) atom. The B(2)-B(2) bond length is 1.77 Å. The B(2)-B(3) bond length is 1.76 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to two equivalent Pu(1), four equivalent Os(1), one B(2), one B(3), and one B(4) atom. The B(3)-B(3) bond length is 1.75 Å. The B(3)-B(4) bond length is 1.76 Å. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to four equivalent Pu(1), two equivalent Os(1), one B(3), and two equivalent B(1) atoms.