Y3(CuGe)4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent Ge(1) and four equivalent Ge(2) atoms to form distorted edge-sharing YGe6 octahedra. In the second Y site, Y(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 Y(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 Y(1), two equivalent Y(2), and six equivalent Cu(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Y(1), four equivalent Y(2), two equivalent Cu(1), and one Ge(2) atom.
Y3(CuGe)4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent Ge(1) and four equivalent Ge(2) atoms to form distorted edge-sharing YGe6 octahedra. Both Y(1)-Ge(1) bond lengths are 3.02 Å. All Y(1)-Ge(2) bond lengths are 2.95 Å. In the second Y site, Y(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 (3.01 Å) and two longer (3.08 Å) Y(2)-Cu(1) bond lengths. Both Y(2)-Ge(1) bond lengths are 3.02 Å. All Y(2)-Ge(2) bond lengths are 3.06 Å. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Y(2), one Cu(1), one Ge(2), and three equivalent Ge(1) atoms. The Cu(1)-Cu(1) bond length is 2.53 Å. The Cu(1)-Ge(2) bond length is 2.50 Å. There are two shorter (2.55 Å) and one longer (2.61 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 Y(1), two equivalent Y(2), and six equivalent Cu(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Y(1), four equivalent Y(2), two equivalent Cu(1), and one Ge(2) atom. The Ge(2)-Ge(2) bond length is 2.55 Å.