Mg2Cu3Ge is Hexagonal Laves-derived structured and crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to three equivalent Mg(2), one Cu(3), two equivalent Cu(1), two equivalent Cu(2), three equivalent Cu(4), and four equivalent Ge(1) atoms. In the second Mg site, Mg(2) is bonded in a 16-coordinate geometry to one Mg(2), three equivalent Mg(1), one Cu(1), two equivalent Cu(3), three equivalent Cu(4), four equivalent Cu(2), and two equivalent Ge(1) atoms. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), two equivalent Cu(4), and four equivalent Ge(1) atoms to form CuMg6Cu2Ge4 cuboctahedra that share corners with two equivalent Cu(3)Mg6Cu6 cuboctahedra, corners with four equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, corners with four equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, corners with eight equivalent Cu(2)Mg6Cu6 cuboctahedra, edges with two equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, edges with four equivalent Cu(3)Mg6Cu6 cuboctahedra, faces with four equivalent Cu(2)Mg6Cu6 cuboctahedra, faces with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, and faces with eight equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Mg(1), four equivalent Mg(2), two equivalent Cu(2), two equivalent Cu(3), and two equivalent Cu(4) atoms to form CuMg6Cu6 cuboctahedra that share corners with four equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, corners with four equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, corners with four equivalent Cu(2)Mg6Cu6 cuboctahedra, corners with six equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, edges with two equivalent Cu(2)Mg6Cu6 cuboctahedra, edges with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, faces with two equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, faces with two equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, faces with four equivalent Cu(2)Mg6Cu6 cuboctahedra, faces with four equivalent Cu(3)Mg6Cu6 cuboctahedra, and faces with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra. In the third Cu site, Cu(3) is bonded to two equivalent Mg(1), four equivalent Mg(2), two equivalent Cu(4), and four equivalent Cu(2) atoms to form CuMg6Cu6 cuboctahedra that share corners with two equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, corners with four equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, corners with four equivalent Cu(3)Mg6Cu6 cuboctahedra, corners with eight equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, edges with two equivalent Cu(3)Mg6Cu6 cuboctahedra, edges with four equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, faces with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, faces with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, and faces with eight equivalent Cu(2)Mg6Cu6 cuboctahedra. In the fourth Cu site, Cu(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), one Cu(1), one Cu(3), two equivalent Cu(2), and two equivalent Ge(1) atoms to form CuMg6Cu4Ge2 cuboctahedra that share corners with two equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, corners with two equivalent Cu(3)Mg6Cu6 cuboctahedra, corners with four equivalent Cu(2)Mg6Cu6 cuboctahedra, corners with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, edges with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, faces with two equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, faces with three equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, faces with three equivalent Cu(3)Mg6Cu6 cuboctahedra, faces with six equivalent Cu(2)Mg6Cu6 cuboctahedra, and faces with six equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra. Ge(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), two equivalent Cu(1), two equivalent Cu(4), and two equivalent Ge(1) atoms to form distorted GeMg6Cu4Ge2 cuboctahedra that share corners with four equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, corners with four equivalent Cu(3)Mg6Cu6 cuboctahedra, corners with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, corners with six equivalent Cu(2)Mg6Cu6 cuboctahedra, edges with two equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, edges with four equivalent Cu(2)Mg6Cu6 cuboctahedra, faces with two equivalent Cu(2)Mg6Cu6 cuboctahedra, faces with two equivalent Cu(3)Mg6Cu6 cuboctahedra, faces with four equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, faces with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, and faces with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra.
Mg2Cu3Ge is Hexagonal Laves-derived structured and crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to three equivalent Mg(2), one Cu(3), two equivalent Cu(1), two equivalent Cu(2), three equivalent Cu(4), and four equivalent Ge(1) atoms. There are two shorter (3.09 Å) and one longer (3.10 Å) Mg(1)-Mg(2) bond length. The Mg(1)-Cu(3) bond length is 2.78 Å. Both Mg(1)-Cu(1) bond lengths are 3.07 Å. Both Mg(1)-Cu(2) bond lengths are 2.80 Å. There is one shorter (2.94 Å) and two longer (2.98 Å) Mg(1)-Cu(4) bond lengths. There are two shorter (3.02 Å) and two longer (3.05 Å) Mg(1)-Ge(1) bond lengths. In the second Mg site, Mg(2) is bonded in a 16-coordinate geometry to one Mg(2), three equivalent Mg(1), one Cu(1), two equivalent Cu(3), three equivalent Cu(4), four equivalent Cu(2), and two equivalent Ge(1) atoms. The Mg(2)-Mg(2) bond length is 2.85 Å. The Mg(2)-Cu(1) bond length is 2.96 Å. Both Mg(2)-Cu(3) bond lengths are 2.94 Å. There is one shorter (2.93 Å) and two longer (3.03 Å) Mg(2)-Cu(4) bond lengths. There are two shorter (2.90 Å) and two longer (2.92 Å) Mg(2)-Cu(2) bond lengths. Both Mg(2)-Ge(1) bond lengths are 3.02 Å. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), two equivalent Cu(4), and four equivalent Ge(1) atoms to form CuMg6Cu2Ge4 cuboctahedra that share corners with two equivalent Cu(3)Mg6Cu6 cuboctahedra, corners with four equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, corners with four equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, corners with eight equivalent Cu(2)Mg6Cu6 cuboctahedra, edges with two equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, edges with four equivalent Cu(3)Mg6Cu6 cuboctahedra, faces with four equivalent Cu(2)Mg6Cu6 cuboctahedra, faces with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, and faces with eight equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra. Both Cu(1)-Cu(4) bond lengths are 2.54 Å. There are two shorter (2.49 Å) and two longer (2.58 Å) Cu(1)-Ge(1) bond lengths. In the second Cu site, Cu(2) is bonded to two equivalent Mg(1), four equivalent Mg(2), two equivalent Cu(2), two equivalent Cu(3), and two equivalent Cu(4) atoms to form CuMg6Cu6 cuboctahedra that share corners with four equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, corners with four equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, corners with four equivalent Cu(2)Mg6Cu6 cuboctahedra, corners with six equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, edges with two equivalent Cu(2)Mg6Cu6 cuboctahedra, edges with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, faces with two equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, faces with two equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, faces with four equivalent Cu(2)Mg6Cu6 cuboctahedra, faces with four equivalent Cu(3)Mg6Cu6 cuboctahedra, and faces with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra. There is one shorter (2.54 Å) and one longer (2.61 Å) Cu(2)-Cu(2) bond length. There is one shorter (2.51 Å) and one longer (2.56 Å) Cu(2)-Cu(3) bond length. Both Cu(2)-Cu(4) bond lengths are 2.50 Å. In the third Cu site, Cu(3) is bonded to two equivalent Mg(1), four equivalent Mg(2), two equivalent Cu(4), and four equivalent Cu(2) atoms to form CuMg6Cu6 cuboctahedra that share corners with two equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, corners with four equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, corners with four equivalent Cu(3)Mg6Cu6 cuboctahedra, corners with eight equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, edges with two equivalent Cu(3)Mg6Cu6 cuboctahedra, edges with four equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, faces with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, faces with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, and faces with eight equivalent Cu(2)Mg6Cu6 cuboctahedra. Both Cu(3)-Cu(4) bond lengths are 2.51 Å. In the fourth Cu site, Cu(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), one Cu(1), one Cu(3), two equivalent Cu(2), and two equivalent Ge(1) atoms to form CuMg6Cu4Ge2 cuboctahedra that share corners with two equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, corners with two equivalent Cu(3)Mg6Cu6 cuboctahedra, corners with four equivalent Cu(2)Mg6Cu6 cuboctahedra, corners with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, edges with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, faces with two equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, faces with three equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, faces with three equivalent Cu(3)Mg6Cu6 cuboctahedra, faces with six equivalent Cu(2)Mg6Cu6 cuboctahedra, and faces with six equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra. Both Cu(4)-Ge(1) bond lengths are 2.52 Å. Ge(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), two equivalent Cu(1), two equivalent Cu(4), and two equivalent Ge(1) atoms to form distorted GeMg6Cu4Ge2 cuboctahedra that share corners with four equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra, corners with four equivalent Cu(3)Mg6Cu6 cuboctahedra, corners with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, corners with six equivalent Cu(2)Mg6Cu6 cuboctahedra, edges with two equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, edges with four equivalent Cu(2)Mg6Cu6 cuboctahedra, faces with two equivalent Cu(2)Mg6Cu6 cuboctahedra, faces with two equivalent Cu(3)Mg6Cu6 cuboctahedra, faces with four equivalent Cu(1)Mg6Cu2Ge4 cuboctahedra, faces with four equivalent Ge(1)Mg6Cu4Ge2 cuboctahedra, and faces with six equivalent Cu(4)Mg6Cu4Ge2 cuboctahedra. There is one shorter (2.55 Å) and one longer (2.59 Å) Ge(1)-Ge(1) bond length.