Au3Cu is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. Au(1) is bonded to eight equivalent Au(1) and four equivalent Cu(1) atoms to form distorted AuCu4Au8 cuboctahedra that share corners with four equivalent Cu(1)Au12 cuboctahedra, corners with fourteen equivalent Au(1)Cu4Au8 cuboctahedra, edges with six equivalent Cu(1)Au12 cuboctahedra, edges with twelve equivalent Au(1)Cu4Au8 cuboctahedra, faces with four equivalent Cu(1)Au12 cuboctahedra, and faces with sixteen equivalent Au(1)Cu4Au8 cuboctahedra. Cu(1) is bonded to twelve equivalent Au(1) atoms to form CuAu12 cuboctahedra that share corners with six equivalent Cu(1)Au12 cuboctahedra, corners with twelve equivalent Au(1)Cu4Au8 cuboctahedra, edges with eighteen equivalent Au(1)Cu4Au8 cuboctahedra, faces with eight equivalent Cu(1)Au12 cuboctahedra, and faces with twelve equivalent Au(1)Cu4Au8 cuboctahedra.
Au3Cu is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. Au(1) is bonded to eight equivalent Au(1) and four equivalent Cu(1) atoms to form distorted AuCu4Au8 cuboctahedra that share corners with four equivalent Cu(1)Au12 cuboctahedra, corners with fourteen equivalent Au(1)Cu4Au8 cuboctahedra, edges with six equivalent Cu(1)Au12 cuboctahedra, edges with twelve equivalent Au(1)Cu4Au8 cuboctahedra, faces with four equivalent Cu(1)Au12 cuboctahedra, and faces with sixteen equivalent Au(1)Cu4Au8 cuboctahedra. There are a spread of Au(1)-Au(1) bond distances ranging from 2.77-2.88 Å. There are two shorter (2.82 Å) and two longer (2.85 Å) Au(1)-Cu(1) bond lengths. Cu(1) is bonded to twelve equivalent Au(1) atoms to form CuAu12 cuboctahedra that share corners with six equivalent Cu(1)Au12 cuboctahedra, corners with twelve equivalent Au(1)Cu4Au8 cuboctahedra, edges with eighteen equivalent Au(1)Cu4Au8 cuboctahedra, faces with eight equivalent Cu(1)Au12 cuboctahedra, and faces with twelve equivalent Au(1)Cu4Au8 cuboctahedra.