Yb6Cu23 crystallizes in the cubic Fm-3m space group. Yb(1) is bonded in a 12-coordinate geometry to four equivalent Cu(2), four equivalent Cu(3), and four equivalent Cu(4) atoms. There are four inequivalent Cu sites. In the first Cu site, Cu(4) is bonded in a distorted q6 geometry to three equivalent Yb(1), three equivalent Cu(2), three equivalent Cu(3), and three equivalent Cu(4) atoms. In the second Cu site, Cu(1) is bonded in a body-centered cubic geometry to eight equivalent Cu(3) atoms. In the third Cu site, Cu(2) is bonded to four equivalent Yb(1), four equivalent Cu(3), and four equivalent Cu(4) atoms to form a mixture of face and corner-sharing CuYb4Cu8 cuboctahedra. In the fourth Cu site, Cu(3) is bonded in a 13-coordinate geometry to three equivalent Yb(1), one Cu(1), three equivalent Cu(2), three equivalent Cu(3), and three equivalent Cu(4) atoms.
Yb6Cu23 crystallizes in the cubic Fm-3m space group. Yb(1) is bonded in a 12-coordinate geometry to four equivalent Cu(2), four equivalent Cu(3), and four equivalent Cu(4) atoms. All Yb(1)-Cu(2) bond lengths are 2.99 Å. All Yb(1)-Cu(3) bond lengths are 2.77 Å. All Yb(1)-Cu(4) bond lengths are 2.99 Å. There are four inequivalent Cu sites. In the first Cu site, Cu(4) is bonded in a distorted q6 geometry to three equivalent Yb(1), three equivalent Cu(2), three equivalent Cu(3), and three equivalent Cu(4) atoms. All Cu(4)-Cu(2) bond lengths are 2.43 Å. All Cu(4)-Cu(3) bond lengths are 2.58 Å. All Cu(4)-Cu(4) bond lengths are 2.55 Å. In the second Cu site, Cu(1) is bonded in a body-centered cubic geometry to eight equivalent Cu(3) atoms. All Cu(1)-Cu(3) bond lengths are 2.52 Å. In the third Cu site, Cu(2) is bonded to four equivalent Yb(1), four equivalent Cu(3), and four equivalent Cu(4) atoms to form a mixture of face and corner-sharing CuYb4Cu8 cuboctahedra. All Cu(2)-Cu(3) bond lengths are 2.60 Å. In the fourth Cu site, Cu(3) is bonded in a 13-coordinate geometry to three equivalent Yb(1), one Cu(1), three equivalent Cu(2), three equivalent Cu(3), and three equivalent Cu(4) atoms. All Cu(3)-Cu(3) bond lengths are 2.91 Å.