SmIr2P2 crystallizes in the tetragonal P4/nmm space group. Sm(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Ir(2), four equivalent P(1), and four equivalent P(2) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Sm(1) and four equivalent P(2) atoms to form a mixture of distorted edge and face-sharing IrSm4P4 cuboctahedra. In the second Ir site, Ir(2) is bonded in a 9-coordinate geometry to four equivalent Sm(1), one P(2), and four equivalent P(1) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 8-coordinate geometry to four equivalent Sm(1) and four equivalent Ir(2) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to four equivalent Sm(1), one Ir(2), and four equivalent Ir(1) atoms.
SmIr2P2 crystallizes in the tetragonal P4/nmm space group. Sm(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Ir(2), four equivalent P(1), and four equivalent P(2) atoms. All Sm(1)-Ir(1) bond lengths are 3.22 Å. All Sm(1)-Ir(2) bond lengths are 3.18 Å. All Sm(1)-P(1) bond lengths are 3.11 Å. All Sm(1)-P(2) bond lengths are 3.13 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Sm(1) and four equivalent P(2) atoms to form a mixture of distorted edge and face-sharing IrSm4P4 cuboctahedra. All Ir(1)-P(2) bond lengths are 2.47 Å. In the second Ir site, Ir(2) is bonded in a 9-coordinate geometry to four equivalent Sm(1), one P(2), and four equivalent P(1) atoms. The Ir(2)-P(2) bond length is 2.36 Å. All Ir(2)-P(1) bond lengths are 2.34 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 8-coordinate geometry to four equivalent Sm(1) and four equivalent Ir(2) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to four equivalent Sm(1), one Ir(2), and four equivalent Ir(1) atoms.