UIr crystallizes in the monoclinic P2_1/c space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 7-coordinate geometry to three equivalent Ir(2) and four equivalent Ir(1) atoms. In the second U site, U(2) is bonded in a 5-coordinate geometry to three equivalent Ir(1) and four equivalent Ir(2) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 7-coordinate geometry to three equivalent U(2), four equivalent U(1), and two equivalent Ir(2) atoms. In the second Ir site, Ir(2) is bonded in a 10-coordinate geometry to three equivalent U(1), four equivalent U(2), one Ir(2), and two equivalent Ir(1) atoms.
UIr crystallizes in the monoclinic P2_1/c space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 7-coordinate geometry to three equivalent Ir(2) and four equivalent Ir(1) atoms. There are a spread of U(1)-Ir(2) bond distances ranging from 2.84-3.06 Å. There are a spread of U(1)-Ir(1) bond distances ranging from 2.77-2.95 Å. In the second U site, U(2) is bonded in a 5-coordinate geometry to three equivalent Ir(1) and four equivalent Ir(2) atoms. There are a spread of U(2)-Ir(1) bond distances ranging from 2.86-3.19 Å. There are a spread of U(2)-Ir(2) bond distances ranging from 2.79-3.27 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 7-coordinate geometry to three equivalent U(2), four equivalent U(1), and two equivalent Ir(2) atoms. There is one shorter (3.09 Å) and one longer (3.18 Å) Ir(1)-Ir(2) bond length. In the second Ir site, Ir(2) is bonded in a 10-coordinate geometry to three equivalent U(1), four equivalent U(2), one Ir(2), and two equivalent Ir(1) atoms. The Ir(2)-Ir(2) bond length is 2.98 Å.