Ac3Pr is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Ac(1) is bonded to eight equivalent Ac(1) and four equivalent Pr(1) atoms to form AcAc8Pr4 cuboctahedra that share corners with four equivalent Pr(1)Ac12 cuboctahedra, corners with fourteen equivalent Ac(1)Ac8Pr4 cuboctahedra, edges with six equivalent Pr(1)Ac12 cuboctahedra, edges with twelve equivalent Ac(1)Ac8Pr4 cuboctahedra, faces with four equivalent Pr(1)Ac12 cuboctahedra, and faces with sixteen equivalent Ac(1)Ac8Pr4 cuboctahedra. Pr(1) is bonded to twelve equivalent Ac(1) atoms to form PrAc12 cuboctahedra that share corners with six equivalent Pr(1)Ac12 cuboctahedra, corners with twelve equivalent Ac(1)Ac8Pr4 cuboctahedra, edges with eighteen equivalent Ac(1)Ac8Pr4 cuboctahedra, faces with eight equivalent Pr(1)Ac12 cuboctahedra, and faces with twelve equivalent Ac(1)Ac8Pr4 cuboctahedra.
Ac3Pr is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Ac(1) is bonded to eight equivalent Ac(1) and four equivalent Pr(1) atoms to form AcAc8Pr4 cuboctahedra that share corners with four equivalent Pr(1)Ac12 cuboctahedra, corners with fourteen equivalent Ac(1)Ac8Pr4 cuboctahedra, edges with six equivalent Pr(1)Ac12 cuboctahedra, edges with twelve equivalent Ac(1)Ac8Pr4 cuboctahedra, faces with four equivalent Pr(1)Ac12 cuboctahedra, and faces with sixteen equivalent Ac(1)Ac8Pr4 cuboctahedra. There are a spread of Ac(1)-Ac(1) bond distances ranging from 3.94-4.04 Å. There are two shorter (3.92 Å) and two longer (4.01 Å) Ac(1)-Pr(1) bond lengths. Pr(1) is bonded to twelve equivalent Ac(1) atoms to form PrAc12 cuboctahedra that share corners with six equivalent Pr(1)Ac12 cuboctahedra, corners with twelve equivalent Ac(1)Ac8Pr4 cuboctahedra, edges with eighteen equivalent Ac(1)Ac8Pr4 cuboctahedra, faces with eight equivalent Pr(1)Ac12 cuboctahedra, and faces with twelve equivalent Ac(1)Ac8Pr4 cuboctahedra.