Sm2(IrSi)3 crystallizes in the tetragonal P4/mmm space group. Sm(1) is bonded to four equivalent Sm(1), one Ir(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing SmSm4SiIr octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a distorted linear geometry to one Sm(1) and one Si(2) atom. In the second Ir site, Ir(2) is bonded in a distorted linear geometry to two equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted linear geometry to one Sm(1) and one Ir(2) atom. In the second Si site, Si(2) is bonded in a linear geometry to two equivalent Ir(1) atoms.
Sm2(IrSi)3 crystallizes in the tetragonal P4/mmm space group. Sm(1) is bonded to four equivalent Sm(1), one Ir(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing SmSm4SiIr octahedra. The corner-sharing octahedra are not tilted. All Sm(1)-Sm(1) bond lengths are 2.81 Å. The Sm(1)-Ir(1) bond length is 2.70 Å. The Sm(1)-Si(1) bond length is 3.00 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a distorted linear geometry to one Sm(1) and one Si(2) atom. The Ir(1)-Si(2) bond length is 2.25 Å. In the second Ir site, Ir(2) is bonded in a distorted linear geometry to two equivalent Si(1) atoms. Both Ir(2)-Si(1) bond lengths are 2.30 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted linear geometry to one Sm(1) and one Ir(2) atom. In the second Si site, Si(2) is bonded in a linear geometry to two equivalent Ir(1) atoms.