ReIr3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Re(1) is bonded to twelve equivalent Ir(1) atoms to form ReIr12 cuboctahedra that share corners with six equivalent Re(1)Ir12 cuboctahedra, corners with twelve equivalent Ir(1)Re4Ir8 cuboctahedra, edges with eighteen equivalent Ir(1)Re4Ir8 cuboctahedra, faces with eight equivalent Re(1)Ir12 cuboctahedra, and faces with twelve equivalent Ir(1)Re4Ir8 cuboctahedra. Ir(1) is bonded to four equivalent Re(1) and eight equivalent Ir(1) atoms to form distorted IrRe4Ir8 cuboctahedra that share corners with four equivalent Re(1)Ir12 cuboctahedra, corners with fourteen equivalent Ir(1)Re4Ir8 cuboctahedra, edges with six equivalent Re(1)Ir12 cuboctahedra, edges with twelve equivalent Ir(1)Re4Ir8 cuboctahedra, faces with four equivalent Re(1)Ir12 cuboctahedra, and faces with sixteen equivalent Ir(1)Re4Ir8 cuboctahedra.
ReIr3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Re(1) is bonded to twelve equivalent Ir(1) atoms to form ReIr12 cuboctahedra that share corners with six equivalent Re(1)Ir12 cuboctahedra, corners with twelve equivalent Ir(1)Re4Ir8 cuboctahedra, edges with eighteen equivalent Ir(1)Re4Ir8 cuboctahedra, faces with eight equivalent Re(1)Ir12 cuboctahedra, and faces with twelve equivalent Ir(1)Re4Ir8 cuboctahedra. There are six shorter (2.70 Å) and six longer (2.75 Å) Re(1)-Ir(1) bond lengths. Ir(1) is bonded to four equivalent Re(1) and eight equivalent Ir(1) atoms to form distorted IrRe4Ir8 cuboctahedra that share corners with four equivalent Re(1)Ir12 cuboctahedra, corners with fourteen equivalent Ir(1)Re4Ir8 cuboctahedra, edges with six equivalent Re(1)Ir12 cuboctahedra, edges with twelve equivalent Ir(1)Re4Ir8 cuboctahedra, faces with four equivalent Re(1)Ir12 cuboctahedra, and faces with sixteen equivalent Ir(1)Re4Ir8 cuboctahedra. There are a spread of Ir(1)-Ir(1) bond distances ranging from 2.71-2.76 Å.