Re3Os is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Re(1) is bonded to eight equivalent Re(1) and four equivalent Os(1) atoms to form distorted ReRe8Os4 cuboctahedra that share corners with four equivalent Os(1)Re12 cuboctahedra, corners with fourteen equivalent Re(1)Re8Os4 cuboctahedra, edges with six equivalent Os(1)Re12 cuboctahedra, edges with twelve equivalent Re(1)Re8Os4 cuboctahedra, faces with four equivalent Os(1)Re12 cuboctahedra, and faces with sixteen equivalent Re(1)Re8Os4 cuboctahedra. Os(1) is bonded to twelve equivalent Re(1) atoms to form OsRe12 cuboctahedra that share corners with six equivalent Os(1)Re12 cuboctahedra, corners with twelve equivalent Re(1)Re8Os4 cuboctahedra, edges with eighteen equivalent Re(1)Re8Os4 cuboctahedra, faces with eight equivalent Os(1)Re12 cuboctahedra, and faces with twelve equivalent Re(1)Re8Os4 cuboctahedra.
Re3Os is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Re(1) is bonded to eight equivalent Re(1) and four equivalent Os(1) atoms to form distorted ReRe8Os4 cuboctahedra that share corners with four equivalent Os(1)Re12 cuboctahedra, corners with fourteen equivalent Re(1)Re8Os4 cuboctahedra, edges with six equivalent Os(1)Re12 cuboctahedra, edges with twelve equivalent Re(1)Re8Os4 cuboctahedra, faces with four equivalent Os(1)Re12 cuboctahedra, and faces with sixteen equivalent Re(1)Re8Os4 cuboctahedra. There are a spread of Re(1)-Re(1) bond distances ranging from 2.72-2.79 Å. There are two shorter (2.73 Å) and two longer (2.77 Å) Re(1)-Os(1) bond lengths. Os(1) is bonded to twelve equivalent Re(1) atoms to form OsRe12 cuboctahedra that share corners with six equivalent Os(1)Re12 cuboctahedra, corners with twelve equivalent Re(1)Re8Os4 cuboctahedra, edges with eighteen equivalent Re(1)Re8Os4 cuboctahedra, faces with eight equivalent Os(1)Re12 cuboctahedra, and faces with twelve equivalent Re(1)Re8Os4 cuboctahedra.