Ir5La crystallizes in the hexagonal P6/mmm space group. La(1) is bonded in a 18-coordinate geometry to six equivalent Ir(1) and twelve equivalent Ir(2) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 9-coordinate geometry to three equivalent La(1) and six equivalent Ir(2) atoms. In the second Ir site, Ir(2) is bonded to four equivalent La(1), four equivalent Ir(1), and four equivalent Ir(2) atoms to form a mixture of edge, face, and corner-sharing IrLa4Ir8 cuboctahedra.
Ir5La crystallizes in the hexagonal P6/mmm space group. La(1) is bonded in a 18-coordinate geometry to six equivalent Ir(1) and twelve equivalent Ir(2) atoms. All La(1)-Ir(1) bond lengths are 3.11 Å. All La(1)-Ir(2) bond lengths are 3.46 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 9-coordinate geometry to three equivalent La(1) and six equivalent Ir(2) atoms. All Ir(1)-Ir(2) bond lengths are 2.67 Å. In the second Ir site, Ir(2) is bonded to four equivalent La(1), four equivalent Ir(1), and four equivalent Ir(2) atoms to form a mixture of edge, face, and corner-sharing IrLa4Ir8 cuboctahedra. All Ir(2)-Ir(2) bond lengths are 2.70 Å.