TbAu3Al7 crystallizes in the trigonal R-3c space group. Tb(1) is bonded in a 18-coordinate geometry to six equivalent Au(1) and twelve equivalent Al(1) atoms. Au(1) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Al(2), and six equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted trigonal planar geometry to two equivalent Tb(1) and three equivalent Au(1) atoms. In the second Al site, Al(2) is bonded in a trigonal planar geometry to three equivalent Au(1) atoms.
TbAu3Al7 crystallizes in the trigonal R-3c space group. Tb(1) is bonded in a 18-coordinate geometry to six equivalent Au(1) and twelve equivalent Al(1) atoms. All Tb(1)-Au(1) bond lengths are 3.26 Å. There are six shorter (3.32 Å) and six longer (3.38 Å) Tb(1)-Al(1) bond lengths. Au(1) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Al(2), and six equivalent Al(1) atoms. The Au(1)-Al(2) bond length is 2.62 Å. There are a spread of Au(1)-Al(1) bond distances ranging from 2.59-2.67 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted trigonal planar geometry to two equivalent Tb(1) and three equivalent Au(1) atoms. In the second Al site, Al(2) is bonded in a trigonal planar geometry to three equivalent Au(1) atoms.