Sm2(IrGa3)3 crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 11-coordinate geometry to one Ga(1), two equivalent Ga(3), two equivalent Ga(4), and six equivalent Ga(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 Ga(3), two equivalent Ga(4), and four equivalent Ga(2) atoms. In the second Ir site, Ir(2) is bonded in a 8-coordinate geometry to two equivalent Ga(1), two equivalent Ga(3), and four equivalent Ga(2) atoms. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Ir(2), two equivalent Ga(4), and four equivalent Ga(2) atoms. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to three equivalent Sm(1), one Ir(2), two equivalent Ir(1), one Ga(1), one Ga(3), one Ga(4), and two equivalent Ga(2) atoms. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to two equivalent Sm(1), one Ir(2), two equivalent Ir(1), one Ga(3), two equivalent Ga(2), and two equivalent Ga(4) atoms. In the fourth Ga site, Ga(4) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Ir(1), one Ga(1), one Ga(4), two equivalent Ga(2), and two equivalent Ga(3) atoms.
Sm2(IrGa3)3 crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 11-coordinate geometry to one Ga(1), two equivalent Ga(3), two equivalent Ga(4), and six equivalent Ga(2) atoms. The Sm(1)-Ga(1) bond length is 3.11 Å. Both Sm(1)-Ga(3) bond lengths are 3.06 Å. There is one shorter (3.08 Å) and one longer (3.14 Å) Sm(1)-Ga(4) bond length. There are a spread of Sm(1)-Ga(2) bond distances ranging from 3.02-3.12 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 8-coordinate geometry to two equivalent Ga(3), two equivalent Ga(4), and four equivalent Ga(2) atoms. Both Ir(1)-Ga(3) bond lengths are 2.63 Å. Both Ir(1)-Ga(4) bond lengths are 2.58 Å. There are two shorter (2.58 Å) and two longer (2.62 Å) Ir(1)-Ga(2) bond lengths. In the second Ir site, Ir(2) is bonded in a 8-coordinate geometry to two equivalent Ga(1), two equivalent Ga(3), and four equivalent Ga(2) atoms. Both Ir(2)-Ga(1) bond lengths are 2.58 Å. Both Ir(2)-Ga(3) bond lengths are 2.60 Å. All Ir(2)-Ga(2) bond lengths are 2.62 Å. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Ir(2), two equivalent Ga(4), and four equivalent Ga(2) atoms. Both Ga(1)-Ga(4) bond lengths are 2.70 Å. All Ga(1)-Ga(2) bond lengths are 2.74 Å. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to three equivalent Sm(1), one Ir(2), two equivalent Ir(1), one Ga(1), one Ga(3), one Ga(4), and two equivalent Ga(2) atoms. The Ga(2)-Ga(3) bond length is 2.84 Å. The Ga(2)-Ga(4) bond length is 2.77 Å. There is one shorter (2.91 Å) and one longer (2.94 Å) Ga(2)-Ga(2) bond length. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to two equivalent Sm(1), one Ir(2), two equivalent Ir(1), one Ga(3), two equivalent Ga(2), and two equivalent Ga(4) atoms. The Ga(3)-Ga(3) bond length is 2.78 Å. Both Ga(3)-Ga(4) bond lengths are 2.80 Å. In the fourth Ga site, Ga(4) is bonded in a 10-coordinate geometry to two equivalent Sm(1), two equivalent Ir(1), one Ga(1), one Ga(4), two equivalent Ga(2), and two equivalent Ga(3) atoms. The Ga(4)-Ga(4) bond length is 2.68 Å.