Cu5Ge2 crystallizes in the trigonal R3m space group. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 11-coordinate geometry to one Cu(3), one Cu(5), three equivalent Cu(4), three equivalent Ge(1), and three equivalent Ge(2) atoms. In the second Cu site, Cu(2) is bonded in a 10-coordinate geometry to one Cu(4), three equivalent Cu(3), three equivalent Cu(5), and three equivalent Ge(1) atoms. In the third Cu site, Cu(3) is bonded in a 8-coordinate geometry to one Cu(1), three equivalent Cu(2), one Ge(1), and three equivalent Ge(2) atoms. In the fourth Cu site, Cu(4) is bonded in a 4-coordinate geometry to one Cu(2), three equivalent Cu(1), one Ge(1), and three equivalent Ge(2) atoms. In the fifth Cu site, Cu(5) is bonded in a distorted body-centered cubic geometry to one Cu(1), three equivalent Cu(2), one Ge(2), and three equivalent Ge(1) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 11-coordinate geometry to one Cu(3), one Cu(4), three equivalent Cu(1), three equivalent Cu(2), and three equivalent Cu(5) atoms. In the second Ge site, Ge(2) is bonded in a 7-coordinate geometry to one Cu(5), three equivalent Cu(1), three equivalent Cu(3), and three equivalent Cu(4) atoms.
Cu5Ge2 crystallizes in the trigonal R3m space group. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 11-coordinate geometry to one Cu(3), one Cu(5), three equivalent Cu(4), three equivalent Ge(1), and three equivalent Ge(2) atoms. The Cu(1)-Cu(3) bond length is 2.57 Å. The Cu(1)-Cu(5) bond length is 2.44 Å. All Cu(1)-Cu(4) bond lengths are 2.58 Å. All Cu(1)-Ge(1) bond lengths are 2.78 Å. All Cu(1)-Ge(2) bond lengths are 2.85 Å. In the second Cu site, Cu(2) is bonded in a 10-coordinate geometry to one Cu(4), three equivalent Cu(3), three equivalent Cu(5), and three equivalent Ge(1) atoms. The Cu(2)-Cu(4) bond length is 2.57 Å. All Cu(2)-Cu(3) bond lengths are 2.58 Å. All Cu(2)-Cu(5) bond lengths are 2.44 Å. All Cu(2)-Ge(1) bond lengths are 2.84 Å. In the third Cu site, Cu(3) is bonded in a 8-coordinate geometry to one Cu(1), three equivalent Cu(2), one Ge(1), and three equivalent Ge(2) atoms. The Cu(3)-Ge(1) bond length is 2.56 Å. All Cu(3)-Ge(2) bond lengths are 2.57 Å. In the fourth Cu site, Cu(4) is bonded in a 4-coordinate geometry to one Cu(2), three equivalent Cu(1), one Ge(1), and three equivalent Ge(2) atoms. The Cu(4)-Ge(1) bond length is 2.46 Å. All Cu(4)-Ge(2) bond lengths are 2.45 Å. In the fifth Cu site, Cu(5) is bonded in a distorted body-centered cubic geometry to one Cu(1), three equivalent Cu(2), one Ge(2), and three equivalent Ge(1) atoms. The Cu(5)-Ge(2) bond length is 2.56 Å. All Cu(5)-Ge(1) bond lengths are 2.57 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 11-coordinate geometry to one Cu(3), one Cu(4), three equivalent Cu(1), three equivalent Cu(2), and three equivalent Cu(5) atoms. In the second Ge site, Ge(2) is bonded in a 7-coordinate geometry to one Cu(5), three equivalent Cu(1), three equivalent Cu(3), and three equivalent Cu(4) atoms.