K4Au7Ge2 crystallizes in the trigonal R-3m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to three equivalent Au(1) and three equivalent Au(2) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to nine equivalent Au(2) atoms. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded to six equivalent K(1) and six equivalent Au(2) atoms to form edge-sharing AuK6Au6 cuboctahedra. In the second Au site, Au(2) is bonded in a 1-coordinate geometry to one K(1), three equivalent K(2), one Au(1), and one Ge(1) atom. Ge(1) is bonded in a 3-coordinate geometry to three equivalent Au(2) atoms.
K4Au7Ge2 crystallizes in the trigonal R-3m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to three equivalent Au(1) and three equivalent Au(2) atoms. All K(1)-Au(1) bond lengths are 3.79 Å. All K(1)-Au(2) bond lengths are 3.45 Å. In the second K site, K(2) is bonded in a 9-coordinate geometry to nine equivalent Au(2) atoms. There are three shorter (3.46 Å) and six longer (3.72 Å) K(2)-Au(2) bond lengths. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded to six equivalent K(1) and six equivalent Au(2) atoms to form edge-sharing AuK6Au6 cuboctahedra. All Au(1)-Au(2) bond lengths are 2.77 Å. In the second Au site, Au(2) is bonded in a 1-coordinate geometry to one K(1), three equivalent K(2), one Au(1), and one Ge(1) atom. The Au(2)-Ge(1) bond length is 2.44 Å. Ge(1) is bonded in a 3-coordinate geometry to three equivalent Au(2) atoms.