Dy3(CuGe)4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Ge(1), and four equivalent Ge(2) atoms. In the second Dy site, Dy(2) is bonded to two equivalent Ge(1) and four equivalent Ge(2) atoms to form distorted edge-sharing DyGe6 octahedra. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Dy(1), 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 Dy(2), two equivalent Dy(1), and six equivalent Cu(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Dy(2), four equivalent Dy(1), two equivalent Cu(1), and one Ge(2) atom.
Dy3(CuGe)4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) 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 (2.98 Å) and two longer (3.04 Å) Dy(1)-Cu(1) bond lengths. Both Dy(1)-Ge(1) bond lengths are 2.97 Å. All Dy(1)-Ge(2) bond lengths are 3.04 Å. In the second Dy site, Dy(2) is bonded to two equivalent Ge(1) and four equivalent Ge(2) atoms to form distorted edge-sharing DyGe6 octahedra. Both Dy(2)-Ge(1) bond lengths are 3.00 Å. All Dy(2)-Ge(2) bond lengths are 2.92 Å. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Dy(1), one Cu(1), one Ge(2), and three equivalent Ge(1) atoms. The Cu(1)-Cu(1) bond length is 2.50 Å. The Cu(1)-Ge(2) bond length is 2.47 Å. There are two shorter (2.52 Å) and one longer (2.60 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 Dy(2), two equivalent Dy(1), and six equivalent Cu(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Dy(2), four equivalent Dy(1), two equivalent Cu(1), and one Ge(2) atom. The Ge(2)-Ge(2) bond length is 2.53 Å.