ReOs3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Re(1) is bonded to twelve equivalent Os(1) atoms to form ReOs12 cuboctahedra that share corners with six equivalent Re(1)Os12 cuboctahedra, corners with twelve equivalent Os(1)Re4Os8 cuboctahedra, edges with eighteen equivalent Os(1)Re4Os8 cuboctahedra, faces with eight equivalent Re(1)Os12 cuboctahedra, and faces with twelve equivalent Os(1)Re4Os8 cuboctahedra. Os(1) is bonded to four equivalent Re(1) and eight equivalent Os(1) atoms to form distorted OsRe4Os8 cuboctahedra that share corners with four equivalent Re(1)Os12 cuboctahedra, corners with fourteen equivalent Os(1)Re4Os8 cuboctahedra, edges with six equivalent Re(1)Os12 cuboctahedra, edges with twelve equivalent Os(1)Re4Os8 cuboctahedra, faces with four equivalent Re(1)Os12 cuboctahedra, and faces with sixteen equivalent Os(1)Re4Os8 cuboctahedra.
ReOs3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Re(1) is bonded to twelve equivalent Os(1) atoms to form ReOs12 cuboctahedra that share corners with six equivalent Re(1)Os12 cuboctahedra, corners with twelve equivalent Os(1)Re4Os8 cuboctahedra, edges with eighteen equivalent Os(1)Re4Os8 cuboctahedra, faces with eight equivalent Re(1)Os12 cuboctahedra, and faces with twelve equivalent Os(1)Re4Os8 cuboctahedra. There are six shorter (2.69 Å) and six longer (2.76 Å) Re(1)-Os(1) bond lengths. Os(1) is bonded to four equivalent Re(1) and eight equivalent Os(1) atoms to form distorted OsRe4Os8 cuboctahedra that share corners with four equivalent Re(1)Os12 cuboctahedra, corners with fourteen equivalent Os(1)Re4Os8 cuboctahedra, edges with six equivalent Re(1)Os12 cuboctahedra, edges with twelve equivalent Os(1)Re4Os8 cuboctahedra, faces with four equivalent Re(1)Os12 cuboctahedra, and faces with sixteen equivalent Os(1)Re4Os8 cuboctahedra. There are a spread of Os(1)-Os(1) bond distances ranging from 2.69-2.76 Å.