Sn3.0Cu crystallizes in the hexagonal P6_3/mmc space group. Cu(1) is bonded to twelve equivalent Sn(1) atoms to form CuSn12 cuboctahedra that share corners with six equivalent Cu(1)Sn12 cuboctahedra, corners with twelve equivalent Sn(1)Cu4Sn8 cuboctahedra, edges with eighteen equivalent Sn(1)Cu4Sn8 cuboctahedra, faces with eight equivalent Cu(1)Sn12 cuboctahedra, and faces with twelve equivalent Sn(1)Cu4Sn8 cuboctahedra. Sn(1) is bonded to four equivalent Cu(1) and eight equivalent Sn(1) atoms to form distorted SnCu4Sn8 cuboctahedra that share corners with four equivalent Cu(1)Sn12 cuboctahedra, corners with fourteen equivalent Sn(1)Cu4Sn8 cuboctahedra, edges with six equivalent Cu(1)Sn12 cuboctahedra, edges with twelve equivalent Sn(1)Cu4Sn8 cuboctahedra, faces with four equivalent Cu(1)Sn12 cuboctahedra, and faces with sixteen equivalent Sn(1)Cu4Sn8 cuboctahedra.
Sn3.0Cu crystallizes in the hexagonal P6_3/mmc space group. Cu(1) is bonded to twelve equivalent Sn(1) atoms to form CuSn12 cuboctahedra that share corners with six equivalent Cu(1)Sn12 cuboctahedra, corners with twelve equivalent Sn(1)Cu4Sn8 cuboctahedra, edges with eighteen equivalent Sn(1)Cu4Sn8 cuboctahedra, faces with eight equivalent Cu(1)Sn12 cuboctahedra, and faces with twelve equivalent Sn(1)Cu4Sn8 cuboctahedra. There are six shorter (3.11 Å) and six longer (3.31 Å) Cu(1)-Sn(1) bond lengths. Sn(1) is bonded to four equivalent Cu(1) and eight equivalent Sn(1) atoms to form distorted SnCu4Sn8 cuboctahedra that share corners with four equivalent Cu(1)Sn12 cuboctahedra, corners with fourteen equivalent Sn(1)Cu4Sn8 cuboctahedra, edges with six equivalent Cu(1)Sn12 cuboctahedra, edges with twelve equivalent Sn(1)Cu4Sn8 cuboctahedra, faces with four equivalent Cu(1)Sn12 cuboctahedra, and faces with sixteen equivalent Sn(1)Cu4Sn8 cuboctahedra. There are a spread of Sn(1)-Sn(1) bond distances ranging from 3.19-3.42 Å.