LaB4(OsIr)2 is alpha Pu-derived structured and crystallizes in the tetragonal P4_2 space group. La(1) is bonded in a 20-coordinate geometry to four equivalent Os(1), four equivalent Ir(1), six equivalent B(1), and six equivalent B(2) atoms. Os(1) is bonded in a 4-coordinate geometry to two equivalent La(1), one B(2), and three equivalent B(1) atoms. Ir(1) is bonded in a 4-coordinate geometry to two equivalent La(1), one B(1), and three equivalent B(2) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 6-coordinate geometry to three equivalent La(1), three equivalent Os(1), one Ir(1), and one B(2) atom. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent La(1), one Os(1), three equivalent Ir(1), and one B(1) atom.
LaB4(OsIr)2 is alpha Pu-derived structured and crystallizes in the tetragonal P4_2 space group. La(1) is bonded in a 20-coordinate geometry to four equivalent Os(1), four equivalent Ir(1), six equivalent B(1), and six equivalent B(2) atoms. There are two shorter (3.24 Å) and two longer (3.26 Å) La(1)-Os(1) bond lengths. There are two shorter (3.21 Å) and two longer (3.25 Å) La(1)-Ir(1) bond lengths. There are a spread of La(1)-B(1) bond distances ranging from 2.97-3.51 Å. There are a spread of La(1)-B(2) bond distances ranging from 2.94-3.49 Å. Os(1) is bonded in a 4-coordinate geometry to two equivalent La(1), one B(2), and three equivalent B(1) atoms. The Os(1)-B(2) bond length is 2.15 Å. There are a spread of Os(1)-B(1) bond distances ranging from 2.14-2.18 Å. Ir(1) is bonded in a 4-coordinate geometry to two equivalent La(1), one B(1), and three equivalent B(2) atoms. The Ir(1)-B(1) bond length is 2.15 Å. There are two shorter (2.17 Å) and one longer (2.19 Å) Ir(1)-B(2) bond length. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 6-coordinate geometry to three equivalent La(1), three equivalent Os(1), one Ir(1), and one B(2) atom. The B(1)-B(2) bond length is 1.83 Å. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent La(1), one Os(1), three equivalent Ir(1), and one B(1) atom.