CuFe2Ge2 crystallizes in the orthorhombic Pmma space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 9-coordinate geometry to two equivalent Fe(2), four equivalent Cu(1), two equivalent Ge(1), and three equivalent Ge(2) atoms. In the second Fe site, Fe(2) is bonded in a 10-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), two equivalent Ge(2), and four equivalent Ge(1) atoms. Cu(1) is bonded to four equivalent Fe(1), two equivalent Cu(1), two equivalent Ge(1), and four equivalent Ge(2) atoms to form a mixture of face, corner, and edge-sharing CuFe4Cu2Ge6 cuboctahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 6-coordinate geometry to two equivalent Fe(1), four equivalent Fe(2), and two equivalent Cu(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Fe(2), three equivalent Fe(1), and four equivalent Cu(1) atoms.
CuFe2Ge2 crystallizes in the orthorhombic Pmma space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 9-coordinate geometry to two equivalent Fe(2), four equivalent Cu(1), two equivalent Ge(1), and three equivalent Ge(2) atoms. Both Fe(1)-Fe(2) bond lengths are 2.69 Å. All Fe(1)-Cu(1) bond lengths are 2.55 Å. Both Fe(1)-Ge(1) bond lengths are 2.47 Å. There is one shorter (2.39 Å) and two longer (2.49 Å) Fe(1)-Ge(2) bond lengths. In the second Fe site, Fe(2) is bonded in a 10-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), two equivalent Ge(2), and four equivalent Ge(1) atoms. Both Fe(2)-Fe(2) bond lengths are 2.47 Å. Both Fe(2)-Ge(2) bond lengths are 2.44 Å. All Fe(2)-Ge(1) bond lengths are 2.48 Å. Cu(1) is bonded to four equivalent Fe(1), two equivalent Cu(1), two equivalent Ge(1), and four equivalent Ge(2) atoms to form a mixture of face, corner, and edge-sharing CuFe4Cu2Ge6 cuboctahedra. Both Cu(1)-Cu(1) bond lengths are 2.47 Å. Both Cu(1)-Ge(1) bond lengths are 2.84 Å. All Cu(1)-Ge(2) bond lengths are 2.68 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 6-coordinate geometry to two equivalent Fe(1), four equivalent Fe(2), and two equivalent Cu(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Fe(2), three equivalent Fe(1), and four equivalent Cu(1) atoms.