Y2Co3Al9 crystallizes in the orthorhombic Cmcm space group. Y(1) is bonded in a 11-coordinate geometry to one Al(1), two equivalent Al(2), two equivalent Al(3), and six equivalent Al(4) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 8-coordinate geometry to two equivalent Al(1), two equivalent Al(2), and four equivalent Al(4) atoms. In the second Co site, Co(2) is bonded in a 8-coordinate geometry to two equivalent Al(2), two equivalent Al(3), and four equivalent Al(4) atoms. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to two equivalent Y(1), two equivalent Co(1), two equivalent Al(3), and four equivalent Al(4) atoms. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to two equivalent Y(1), one Co(1), two equivalent Co(2), two equivalent Al(3), and two equivalent Al(4) atoms. In the third Al site, Al(3) is bonded in a 10-coordinate geometry to two equivalent Y(1), two equivalent Co(2), one Al(1), one Al(3), two equivalent Al(2), and two equivalent Al(4) atoms. In the fourth Al site, Al(4) is bonded in a 11-coordinate geometry to three equivalent Y(1), one Co(1), two equivalent Co(2), one Al(1), one Al(2), one Al(3), and two equivalent Al(4) atoms.
Y2Co3Al9 crystallizes in the orthorhombic Cmcm space group. Y(1) is bonded in a 11-coordinate geometry to one Al(1), two equivalent Al(2), two equivalent Al(3), and six equivalent Al(4) atoms. The Y(1)-Al(1) bond length is 2.99 Å. Both Y(1)-Al(2) bond lengths are 3.08 Å. There is one shorter (2.96 Å) and one longer (3.07 Å) Y(1)-Al(3) bond length. There are four shorter (3.00 Å) and two longer (3.01 Å) Y(1)-Al(4) bond lengths. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 8-coordinate geometry to two equivalent Al(1), two equivalent Al(2), and four equivalent Al(4) atoms. Both Co(1)-Al(1) bond lengths are 2.51 Å. Both Co(1)-Al(2) bond lengths are 2.51 Å. All Co(1)-Al(4) bond lengths are 2.57 Å. In the second Co site, Co(2) is bonded in a 8-coordinate geometry to two equivalent Al(2), two equivalent Al(3), and four equivalent Al(4) atoms. Both Co(2)-Al(2) bond lengths are 2.54 Å. Both Co(2)-Al(3) bond lengths are 2.50 Å. There are two shorter (2.48 Å) and two longer (2.57 Å) Co(2)-Al(4) bond lengths. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to two equivalent Y(1), two equivalent Co(1), two equivalent Al(3), and four equivalent Al(4) atoms. Both Al(1)-Al(3) bond lengths are 2.76 Å. All Al(1)-Al(4) bond lengths are 2.74 Å. In the second Al site, Al(2) is bonded in a 3-coordinate geometry to two equivalent Y(1), one Co(1), two equivalent Co(2), two equivalent Al(3), and two equivalent Al(4) atoms. Both Al(2)-Al(3) bond lengths are 2.89 Å. Both Al(2)-Al(4) bond lengths are 2.69 Å. In the third Al site, Al(3) is bonded in a 10-coordinate geometry to two equivalent Y(1), two equivalent Co(2), one Al(1), one Al(3), two equivalent Al(2), and two equivalent Al(4) atoms. The Al(3)-Al(3) bond length is 2.73 Å. Both Al(3)-Al(4) bond lengths are 2.78 Å. In the fourth Al site, Al(4) is bonded in a 11-coordinate geometry to three equivalent Y(1), one Co(1), two equivalent Co(2), one Al(1), one Al(2), one Al(3), and two equivalent Al(4) atoms. There is one shorter (2.76 Å) and one longer (2.82 Å) Al(4)-Al(4) bond length.