NdCo2Al8 crystallizes in the orthorhombic Pbam space group. Nd(1) is bonded in a 13-coordinate geometry to one Al(4), two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), two equivalent Al(6), two equivalent Al(7), and two equivalent Al(8) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to one Al(6), two equivalent Al(5), two equivalent Al(7), two equivalent Al(8), and two equivalent Al(9) atoms. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to one Al(4), one Al(5), one Al(6), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms. There are nine inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Nd(1), two equivalent Co(2), one Al(3), one Al(7), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(6) atoms. In the second Al site, Al(2) is bonded in a 2-coordinate geometry to two equivalent Nd(1), two equivalent Co(2), one Al(8), and two equivalent Al(1) atoms. In the third Al site, Al(3) is bonded in a 2-coordinate geometry to two equivalent Nd(1), two equivalent Co(2), and one Al(1) atom. In the fourth Al site, Al(4) is bonded in a distorted linear geometry to two equivalent Nd(1), two equivalent Co(2), and four equivalent Al(1) atoms. In the fifth Al site, Al(5) is bonded in a 3-coordinate geometry to one Co(2) and two equivalent Co(1) atoms. In the sixth Al site, Al(6) is bonded in a distorted linear geometry to two equivalent Nd(1), one Co(1), one Co(2), two equivalent Al(1), and two equivalent Al(8) atoms. In the seventh Al site, Al(7) is bonded in a 2-coordinate geometry to two equivalent Nd(1), two equivalent Co(1), one Al(1), and one Al(8) atom. In the eighth Al site, Al(8) is bonded in a 9-coordinate geometry to two equivalent Nd(1), two equivalent Co(1), one Al(2), one Al(7), one Al(9), and two equivalent Al(6) atoms. In the ninth Al site, Al(9) is bonded in a 4-coordinate geometry to four equivalent Co(1) and two equivalent Al(8) atoms.
NdCo2Al8 crystallizes in the orthorhombic Pbam space group. Nd(1) is bonded in a 13-coordinate geometry to one Al(4), two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), two equivalent Al(6), two equivalent Al(7), and two equivalent Al(8) atoms. The Nd(1)-Al(4) bond length is 3.25 Å. Both Nd(1)-Al(1) bond lengths are 3.12 Å. Both Nd(1)-Al(2) bond lengths are 3.18 Å. Both Nd(1)-Al(3) bond lengths are 3.17 Å. There is one shorter (3.17 Å) and one longer (3.32 Å) Nd(1)-Al(6) bond length. Both Nd(1)-Al(7) bond lengths are 3.15 Å. Both Nd(1)-Al(8) bond lengths are 3.13 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to one Al(6), two equivalent Al(5), two equivalent Al(7), two equivalent Al(8), and two equivalent Al(9) atoms. The Co(1)-Al(6) bond length is 2.31 Å. There is one shorter (2.50 Å) and one longer (2.51 Å) Co(1)-Al(5) bond length. Both Co(1)-Al(7) bond lengths are 2.53 Å. Both Co(1)-Al(8) bond lengths are 2.54 Å. Both Co(1)-Al(9) bond lengths are 2.44 Å. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to one Al(4), one Al(5), one Al(6), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms. The Co(2)-Al(4) bond length is 2.33 Å. The Co(2)-Al(5) bond length is 2.45 Å. The Co(2)-Al(6) bond length is 2.34 Å. Both Co(2)-Al(1) bond lengths are 2.57 Å. Both Co(2)-Al(2) bond lengths are 2.49 Å. Both Co(2)-Al(3) bond lengths are 2.49 Å. There are nine inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Nd(1), two equivalent Co(2), one Al(3), one Al(7), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(6) atoms. The Al(1)-Al(3) bond length is 2.65 Å. The Al(1)-Al(7) bond length is 2.85 Å. There is one shorter (2.65 Å) and one longer (3.00 Å) Al(1)-Al(2) bond length. Both Al(1)-Al(4) bond lengths are 2.76 Å. Both Al(1)-Al(6) bond lengths are 2.77 Å. In the second Al site, Al(2) is bonded in a 2-coordinate geometry to two equivalent Nd(1), two equivalent Co(2), one Al(8), and two equivalent Al(1) atoms. The Al(2)-Al(8) bond length is 2.68 Å. In the third Al site, Al(3) is bonded in a 2-coordinate geometry to two equivalent Nd(1), two equivalent Co(2), and one Al(1) atom. In the fourth Al site, Al(4) is bonded in a distorted linear geometry to two equivalent Nd(1), two equivalent Co(2), and four equivalent Al(1) atoms. In the fifth Al site, Al(5) is bonded in a 3-coordinate geometry to one Co(2) and two equivalent Co(1) atoms. In the sixth Al site, Al(6) is bonded in a distorted linear geometry to two equivalent Nd(1), one Co(1), one Co(2), two equivalent Al(1), and two equivalent Al(8) atoms. Both Al(6)-Al(8) bond lengths are 2.80 Å. In the seventh Al site, Al(7) is bonded in a 2-coordinate geometry to two equivalent Nd(1), two equivalent Co(1), one Al(1), and one Al(8) atom. The Al(7)-Al(8) bond length is 2.67 Å. In the eighth Al site, Al(8) is bonded in a 9-coordinate geometry to two equivalent Nd(1), two equivalent Co(1), one Al(2), one Al(7), one Al(9), and two equivalent Al(6) atoms. The Al(8)-Al(9) bond length is 2.61 Å. In the ninth Al site, Al(9) is bonded in a 4-coordinate geometry to four equivalent Co(1) and two equivalent Al(8) atoms.