NdCu9Al2 crystallizes in the tetragonal I4_1/amd space group. Nd(1) is bonded in a 18-coordinate geometry to two equivalent Cu(2) and sixteen equivalent Cu(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 14-coordinate geometry to two equivalent Nd(1), eight equivalent Cu(1), and four equivalent Al(1) atoms. In the second Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Cu(2), seven equivalent Cu(1), and two equivalent Al(1) atoms. Al(1) is bonded in a distorted q6 geometry to two equivalent Cu(2) and eight equivalent Cu(1) atoms.
NdCu9Al2 crystallizes in the tetragonal I4_1/amd space group. Nd(1) is bonded in a 18-coordinate geometry to two equivalent Cu(2) and sixteen equivalent Cu(1) atoms. Both Nd(1)-Cu(2) bond lengths are 3.29 Å. There are eight shorter (3.17 Å) and eight longer (3.21 Å) Nd(1)-Cu(1) bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 14-coordinate geometry to two equivalent Nd(1), eight equivalent Cu(1), and four equivalent Al(1) atoms. All Cu(2)-Cu(1) bond lengths are 2.74 Å. All Cu(2)-Al(1) bond lengths are 2.65 Å. In the second Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Cu(2), seven equivalent Cu(1), and two equivalent Al(1) atoms. There are a spread of Cu(1)-Cu(1) bond distances ranging from 2.49-2.79 Å. There is one shorter (2.46 Å) and one longer (2.49 Å) Cu(1)-Al(1) bond length. Al(1) is bonded in a distorted q6 geometry to two equivalent Cu(2) and eight equivalent Cu(1) atoms.