Cu2Sb crystallizes in the tetragonal P4/nmm space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent Cu(1), four equivalent Cu(2), and four equivalent Sb(1) atoms to form a mixture of distorted corner and face-sharing CuCu8Sb4 cuboctahedra. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to four equivalent Cu(1) and five equivalent Sb(1) atoms. Sb(1) is bonded in a 9-coordinate geometry to four equivalent Cu(1) and five equivalent Cu(2) atoms.
Cu2Sb crystallizes in the tetragonal P4/nmm space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent Cu(1), four equivalent Cu(2), and four equivalent Sb(1) atoms to form a mixture of distorted corner and face-sharing CuCu8Sb4 cuboctahedra. All Cu(1)-Cu(1) bond lengths are 2.84 Å. All Cu(1)-Cu(2) bond lengths are 2.55 Å. All Cu(1)-Sb(1) bond lengths are 2.69 Å. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to four equivalent Cu(1) and five equivalent Sb(1) atoms. There is one shorter (2.64 Å) and four longer (2.85 Å) Cu(2)-Sb(1) bond lengths. Sb(1) is bonded in a 9-coordinate geometry to four equivalent Cu(1) and five equivalent Cu(2) atoms.