Au2Al crystallizes in the orthorhombic Pnnm space group. There are five inequivalent Au sites. In the first Au site, Au(1) is bonded in a 4-coordinate geometry to one Al(1) and four equivalent Al(3) atoms. In the second Au site, Au(2) is bonded in a 4-coordinate geometry to two equivalent Al(2) and two equivalent Al(3) atoms. In the third Au site, Au(3) is bonded in a 5-coordinate geometry to one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. In the fourth Au site, Au(4) is bonded in a 4-coordinate geometry to two equivalent Al(1) and two equivalent Al(2) atoms. In the fifth Au site, Au(5) is bonded in a 5-coordinate geometry to two equivalent Al(3) and three equivalent Al(2) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to two equivalent Au(1), four equivalent Au(3), and four equivalent Au(4) atoms. In the second Al site, Al(2) is bonded in a distorted q6 geometry to two equivalent Au(2), two equivalent Au(3), two equivalent Au(4), and three equivalent Au(5) atoms. In the third Al site, Al(3) is bonded in a distorted q6 geometry to one Au(3), two equivalent Au(2), two equivalent Au(5), and four equivalent Au(1) atoms.
Au2Al crystallizes in the orthorhombic Pnnm space group. There are five inequivalent Au sites. In the first Au site, Au(1) is bonded in a 4-coordinate geometry to one Al(1) and four equivalent Al(3) atoms. The Au(1)-Al(1) bond length is 3.07 Å. There are two shorter (2.71 Å) and two longer (2.76 Å) Au(1)-Al(3) bond lengths. In the second Au site, Au(2) is bonded in a 4-coordinate geometry to two equivalent Al(2) and two equivalent Al(3) atoms. Both Au(2)-Al(2) bond lengths are 2.71 Å. Both Au(2)-Al(3) bond lengths are 2.66 Å. In the third Au site, Au(3) is bonded in a 5-coordinate geometry to one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. The Au(3)-Al(3) bond length is 2.65 Å. Both Au(3)-Al(1) bond lengths are 2.77 Å. Both Au(3)-Al(2) bond lengths are 2.79 Å. In the fourth Au site, Au(4) is bonded in a 4-coordinate geometry to two equivalent Al(1) and two equivalent Al(2) atoms. Both Au(4)-Al(1) bond lengths are 2.72 Å. Both Au(4)-Al(2) bond lengths are 2.68 Å. In the fifth Au site, Au(5) is bonded in a 5-coordinate geometry to two equivalent Al(3) and three equivalent Al(2) atoms. Both Au(5)-Al(3) bond lengths are 2.83 Å. All Au(5)-Al(2) bond lengths are 2.76 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to two equivalent Au(1), four equivalent Au(3), and four equivalent Au(4) atoms. In the second Al site, Al(2) is bonded in a distorted q6 geometry to two equivalent Au(2), two equivalent Au(3), two equivalent Au(4), and three equivalent Au(5) atoms. In the third Al site, Al(3) is bonded in a distorted q6 geometry to one Au(3), two equivalent Au(2), two equivalent Au(5), and four equivalent Au(1) atoms.