Au3Ge crystallizes in the hexagonal P-6m2 space group. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded to six equivalent Au(1) and six equivalent Au(2) atoms to form AuAu12 cuboctahedra that share corners with six equivalent Au(1)Au12 cuboctahedra, corners with twelve equivalent Ge(1)Ge6Au6 cuboctahedra, edges with six equivalent Au(1)Au12 cuboctahedra, edges with twelve equivalent Au(2)Ge3Au9 cuboctahedra, faces with two equivalent Ge(1)Ge6Au6 cuboctahedra, faces with six equivalent Au(1)Au12 cuboctahedra, and faces with twelve equivalent Au(2)Ge3Au9 cuboctahedra. In the second Au site, Au(2) is bonded to three equivalent Au(1), six equivalent Au(2), and three equivalent Ge(1) atoms to form distorted AuGe3Au9 cuboctahedra that share corners with eighteen equivalent Au(2)Ge3Au9 cuboctahedra, edges with six equivalent Au(1)Au12 cuboctahedra, edges with six equivalent Au(2)Ge3Au9 cuboctahedra, edges with six equivalent Ge(1)Ge6Au6 cuboctahedra, faces with six equivalent Au(1)Au12 cuboctahedra, faces with six equivalent Ge(1)Ge6Au6 cuboctahedra, and faces with eight equivalent Au(2)Ge3Au9 cuboctahedra. Ge(1) is bonded to six equivalent Au(2) and six equivalent Ge(1) atoms to form distorted GeGe6Au6 cuboctahedra that share corners with six equivalent Ge(1)Ge6Au6 cuboctahedra, corners with twelve equivalent Au(1)Au12 cuboctahedra, edges with six equivalent Ge(1)Ge6Au6 cuboctahedra, edges with twelve equivalent Au(2)Ge3Au9 cuboctahedra, faces with two equivalent Au(1)Au12 cuboctahedra, faces with six equivalent Ge(1)Ge6Au6 cuboctahedra, and faces with twelve equivalent Au(2)Ge3Au9 cuboctahedra.
Au3Ge crystallizes in the hexagonal P-6m2 space group. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded to six equivalent Au(1) and six equivalent Au(2) atoms to form AuAu12 cuboctahedra that share corners with six equivalent Au(1)Au12 cuboctahedra, corners with twelve equivalent Ge(1)Ge6Au6 cuboctahedra, edges with six equivalent Au(1)Au12 cuboctahedra, edges with twelve equivalent Au(2)Ge3Au9 cuboctahedra, faces with two equivalent Ge(1)Ge6Au6 cuboctahedra, faces with six equivalent Au(1)Au12 cuboctahedra, and faces with twelve equivalent Au(2)Ge3Au9 cuboctahedra. All Au(1)-Au(1) bond lengths are 2.96 Å. All Au(1)-Au(2) bond lengths are 2.98 Å. In the second Au site, Au(2) is bonded to three equivalent Au(1), six equivalent Au(2), and three equivalent Ge(1) atoms to form distorted AuGe3Au9 cuboctahedra that share corners with eighteen equivalent Au(2)Ge3Au9 cuboctahedra, edges with six equivalent Au(1)Au12 cuboctahedra, edges with six equivalent Au(2)Ge3Au9 cuboctahedra, edges with six equivalent Ge(1)Ge6Au6 cuboctahedra, faces with six equivalent Au(1)Au12 cuboctahedra, faces with six equivalent Ge(1)Ge6Au6 cuboctahedra, and faces with eight equivalent Au(2)Ge3Au9 cuboctahedra. All Au(2)-Au(2) bond lengths are 2.96 Å. All Au(2)-Ge(1) bond lengths are 2.95 Å. Ge(1) is bonded to six equivalent Au(2) and six equivalent Ge(1) atoms to form distorted GeGe6Au6 cuboctahedra that share corners with six equivalent Ge(1)Ge6Au6 cuboctahedra, corners with twelve equivalent Au(1)Au12 cuboctahedra, edges with six equivalent Ge(1)Ge6Au6 cuboctahedra, edges with twelve equivalent Au(2)Ge3Au9 cuboctahedra, faces with two equivalent Au(1)Au12 cuboctahedra, faces with six equivalent Ge(1)Ge6Au6 cuboctahedra, and faces with twelve equivalent Au(2)Ge3Au9 cuboctahedra. All Ge(1)-Ge(1) bond lengths are 2.96 Å.