AlCu4 crystallizes in the cubic P2_13 space group. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 12-coordinate geometry to three equivalent Cu(1), six equivalent Cu(2), and three equivalent Al(1) atoms. In the second Cu site, Cu(1) is bonded in a 3-coordinate geometry to nine equivalent Cu(2) and three equivalent Al(1) atoms. Al(1) is bonded to three equivalent Cu(1) and nine equivalent Cu(2) atoms to form a mixture of distorted face and corner-sharing AlCu12 cuboctahedra.
AlCu4 crystallizes in the cubic P2_13 space group. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 12-coordinate geometry to three equivalent Cu(1), six equivalent Cu(2), and three equivalent Al(1) atoms. There are a spread of Cu(2)-Cu(1) bond distances ranging from 2.51-2.65 Å. There are a spread of Cu(2)-Cu(2) bond distances ranging from 2.60-2.67 Å. There are a spread of Cu(2)-Al(1) bond distances ranging from 2.52-2.64 Å. In the second Cu site, Cu(1) is bonded in a 3-coordinate geometry to nine equivalent Cu(2) and three equivalent Al(1) atoms. All Cu(1)-Al(1) bond lengths are 2.36 Å. Al(1) is bonded to three equivalent Cu(1) and nine equivalent Cu(2) atoms to form a mixture of distorted face and corner-sharing AlCu12 cuboctahedra.