Yb3Cu4Ge4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to two equivalent Ge(1) and four equivalent Ge(2) atoms to form distorted edge-sharing YbGe6 octahedra. In the second Yb site, Yb(2) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Ge(1), and four equivalent Ge(2) atoms. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Yb(2), one Cu(1), 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 9-coordinate geometry to one Yb(1), two equivalent Yb(2), and six equivalent Cu(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Yb(1), four equivalent Yb(2), two equivalent Cu(1), and one Ge(2) atom.
Yb3Cu4Ge4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to two equivalent Ge(1) and four equivalent Ge(2) atoms to form distorted edge-sharing YbGe6 octahedra. Both Yb(1)-Ge(1) bond lengths are 3.00 Å. All Yb(1)-Ge(2) bond lengths are 2.98 Å. In the second Yb site, Yb(2) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Ge(1), and four equivalent Ge(2) atoms. There are four shorter (3.00 Å) and two longer (3.02 Å) Yb(2)-Cu(1) bond lengths. Both Yb(2)-Ge(1) bond lengths are 2.97 Å. All Yb(2)-Ge(2) bond lengths are 3.04 Å. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Yb(2), one Cu(1), one Ge(2), and three equivalent Ge(1) atoms. The Cu(1)-Cu(1) bond length is 2.54 Å. The Cu(1)-Ge(2) bond length is 2.49 Å. There are two shorter (2.55 Å) and one longer (2.58 Å) Cu(1)-Ge(1) bond length. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Yb(1), two equivalent Yb(2), and six equivalent Cu(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Yb(1), four equivalent Yb(2), two equivalent Cu(1), and one Ge(2) atom. The Ge(2)-Ge(2) bond length is 2.47 Å.