PaAc3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Pa(1) is bonded to twelve equivalent Ac(1) atoms to form PaAc12 cuboctahedra that share corners with six equivalent Pa(1)Ac12 cuboctahedra, corners with twelve equivalent Ac(1)Ac8Pa4 cuboctahedra, edges with eighteen equivalent Ac(1)Ac8Pa4 cuboctahedra, faces with eight equivalent Pa(1)Ac12 cuboctahedra, and faces with twelve equivalent Ac(1)Ac8Pa4 cuboctahedra. Ac(1) is bonded to four equivalent Pa(1) and eight equivalent Ac(1) atoms to form distorted AcAc8Pa4 cuboctahedra that share corners with four equivalent Pa(1)Ac12 cuboctahedra, corners with fourteen equivalent Ac(1)Ac8Pa4 cuboctahedra, edges with six equivalent Pa(1)Ac12 cuboctahedra, edges with twelve equivalent Ac(1)Ac8Pa4 cuboctahedra, faces with four equivalent Pa(1)Ac12 cuboctahedra, and faces with sixteen equivalent Ac(1)Ac8Pa4 cuboctahedra.
PaAc3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Pa(1) is bonded to twelve equivalent Ac(1) atoms to form PaAc12 cuboctahedra that share corners with six equivalent Pa(1)Ac12 cuboctahedra, corners with twelve equivalent Ac(1)Ac8Pa4 cuboctahedra, edges with eighteen equivalent Ac(1)Ac8Pa4 cuboctahedra, faces with eight equivalent Pa(1)Ac12 cuboctahedra, and faces with twelve equivalent Ac(1)Ac8Pa4 cuboctahedra. There are six shorter (3.77 Å) and six longer (3.82 Å) Pa(1)-Ac(1) bond lengths. Ac(1) is bonded to four equivalent Pa(1) and eight equivalent Ac(1) atoms to form distorted AcAc8Pa4 cuboctahedra that share corners with four equivalent Pa(1)Ac12 cuboctahedra, corners with fourteen equivalent Ac(1)Ac8Pa4 cuboctahedra, edges with six equivalent Pa(1)Ac12 cuboctahedra, edges with twelve equivalent Ac(1)Ac8Pa4 cuboctahedra, faces with four equivalent Pa(1)Ac12 cuboctahedra, and faces with sixteen equivalent Ac(1)Ac8Pa4 cuboctahedra. There are a spread of Ac(1)-Ac(1) bond distances ranging from 3.70-3.95 Å.