PrB4(OsIr)2 is alpha Pu-derived structured and crystallizes in the tetragonal P4_2 space group. Pr(1) is bonded in a 4-coordinate geometry to two equivalent B(1) and two equivalent B(2) atoms. Os(1) is bonded in a 4-coordinate geometry to one B(2) and three equivalent B(1) atoms. Ir(1) is bonded in a 4-coordinate geometry to 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 one Pr(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 one Pr(1), one Os(1), three equivalent Ir(1), and one B(1) atom.
PrB4(OsIr)2 is alpha Pu-derived structured and crystallizes in the tetragonal P4_2 space group. Pr(1) is bonded in a 4-coordinate geometry to two equivalent B(1) and two equivalent B(2) atoms. Both Pr(1)-B(1) bond lengths are 2.95 Å. Both Pr(1)-B(2) bond lengths are 2.92 Å. Os(1) is bonded in a 4-coordinate geometry to 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 2.13-2.17 Å. Ir(1) is bonded in a 4-coordinate geometry to one B(1) and three equivalent B(2) atoms. The Ir(1)-B(1) bond length is 2.14 Å. There are a spread of Ir(1)-B(2) bond distances ranging from 2.14-2.20 Å. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 6-coordinate geometry to one Pr(1), three equivalent Os(1), one Ir(1), and one B(2) atom. The B(1)-B(2) bond length is 1.82 Å. In the second B site, B(2) is bonded in a 6-coordinate geometry to one Pr(1), one Os(1), three equivalent Ir(1), and one B(1) atom.