Tb2(IrAl3)3 crystallizes in the orthorhombic Cmcm space group. Tb(1) is bonded in a 11-coordinate geometry to one Al(1), two equivalent Al(3), two equivalent Al(4), and six equivalent Al(2) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 8-coordinate geometry to two equivalent Al(3), two equivalent Al(4), and four equivalent Al(2) atoms. In the second Ir site, Ir(2) is bonded in a 8-coordinate geometry to two equivalent Al(1), two equivalent Al(3), and four equivalent Al(2) atoms. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to two equivalent Tb(1) and two equivalent Ir(2) atoms. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to three equivalent Tb(1), one Ir(2), and two equivalent Ir(1) atoms. In the third Al site, Al(3) is bonded in a 3-coordinate geometry to two equivalent Tb(1), one Ir(2), and two equivalent Ir(1) atoms. In the fourth Al site, Al(4) is bonded in a 2-coordinate geometry to two equivalent Tb(1) and two equivalent Ir(1) atoms.
Tb2(IrAl3)3 crystallizes in the orthorhombic Cmcm space group. Tb(1) is bonded in a 11-coordinate geometry to one Al(1), two equivalent Al(3), two equivalent Al(4), and six equivalent Al(2) atoms. The Tb(1)-Al(1) bond length is 3.08 Å. Both Tb(1)-Al(3) bond lengths are 3.09 Å. There is one shorter (3.04 Å) and one longer (3.15 Å) Tb(1)-Al(4) bond length. There are a spread of Tb(1)-Al(2) bond distances ranging from 3.04-3.06 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 8-coordinate geometry to two equivalent Al(3), two equivalent Al(4), and four equivalent Al(2) atoms. Both Ir(1)-Al(3) bond lengths are 2.60 Å. Both Ir(1)-Al(4) bond lengths are 2.56 Å. There are two shorter (2.55 Å) and two longer (2.60 Å) Ir(1)-Al(2) bond lengths. In the second Ir site, Ir(2) is bonded in a 8-coordinate geometry to two equivalent Al(1), two equivalent Al(3), and four equivalent Al(2) atoms. Both Ir(2)-Al(1) bond lengths are 2.56 Å. Both Ir(2)-Al(3) bond lengths are 2.57 Å. All Ir(2)-Al(2) bond lengths are 2.61 Å. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to two equivalent Tb(1) and two equivalent Ir(2) atoms. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to three equivalent Tb(1), one Ir(2), and two equivalent Ir(1) atoms. In the third Al site, Al(3) is bonded in a 3-coordinate geometry to two equivalent Tb(1), one Ir(2), and two equivalent Ir(1) atoms. In the fourth Al site, Al(4) is bonded in a 2-coordinate geometry to two equivalent Tb(1) and two equivalent Ir(1) atoms.