Al9Ir2 crystallizes in the monoclinic P2_1/c space group. Ir(1) is bonded in a 9-coordinate geometry to one Al(1), two equivalent Al(2), two equivalent Al(3), two equivalent Al(4), and two equivalent Al(5) atoms. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a linear geometry to two equivalent Ir(1) atoms. In the second Al site, Al(2) is bonded in a 2-coordinate geometry to two equivalent Ir(1) atoms. In the third Al site, Al(3) is bonded in a 2-coordinate geometry to two equivalent Ir(1) atoms. In the fourth Al site, Al(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Ir(1) atoms. In the fifth Al site, Al(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Ir(1) atoms.
Al9Ir2 crystallizes in the monoclinic P2_1/c space group. Ir(1) is bonded in a 9-coordinate geometry to one Al(1), two equivalent Al(2), two equivalent Al(3), two equivalent Al(4), and two equivalent Al(5) atoms. The Ir(1)-Al(1) bond length is 2.46 Å. There is one shorter (2.54 Å) and one longer (2.56 Å) Ir(1)-Al(2) bond length. There is one shorter (2.53 Å) and one longer (2.55 Å) Ir(1)-Al(3) bond length. There is one shorter (2.58 Å) and one longer (2.59 Å) Ir(1)-Al(4) bond length. There is one shorter (2.54 Å) and one longer (2.55 Å) Ir(1)-Al(5) bond length. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a linear geometry to two equivalent Ir(1) atoms. In the second Al site, Al(2) is bonded in a 2-coordinate geometry to two equivalent Ir(1) atoms. In the third Al site, Al(3) is bonded in a 2-coordinate geometry to two equivalent Ir(1) atoms. In the fourth Al site, Al(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Ir(1) atoms. In the fifth Al site, Al(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Ir(1) atoms.