PrMn4Al8 crystallizes in the tetragonal I4/mmm space group. Pr(1) is bonded in a 20-coordinate geometry to eight equivalent Mn(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Mn(1) is bonded to two equivalent Pr(1), two equivalent Mn(1), four equivalent Al(1), and four equivalent Al(2) atoms to form distorted MnPr2Mn2Al8 cuboctahedra that share corners with eight equivalent Al(2)Pr2Mn4Al6 cuboctahedra, corners with ten equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, edges with four equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, edges with four equivalent Al(2)Pr2Mn4Al6 cuboctahedra, faces with six equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, and faces with eight equivalent Al(2)Pr2Mn4Al6 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Pr(1), four equivalent Mn(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to two equivalent Pr(1), four equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms to form distorted AlPr2Mn4Al6 cuboctahedra that share corners with eight equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, corners with ten equivalent Al(2)Pr2Mn4Al6 cuboctahedra, edges with three equivalent Al(2)Pr2Mn4Al6 cuboctahedra, edges with four equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, faces with seven equivalent Al(2)Pr2Mn4Al6 cuboctahedra, and faces with eight equivalent Mn(1)Pr2Mn2Al8 cuboctahedra.
PrMn4Al8 crystallizes in the tetragonal I4/mmm space group. Pr(1) is bonded in a 20-coordinate geometry to eight equivalent Mn(1), four equivalent Al(1), and eight equivalent Al(2) atoms. All Pr(1)-Mn(1) bond lengths are 3.41 Å. All Pr(1)-Al(1) bond lengths are 3.04 Å. All Pr(1)-Al(2) bond lengths are 3.31 Å. Mn(1) is bonded to two equivalent Pr(1), two equivalent Mn(1), four equivalent Al(1), and four equivalent Al(2) atoms to form distorted MnPr2Mn2Al8 cuboctahedra that share corners with eight equivalent Al(2)Pr2Mn4Al6 cuboctahedra, corners with ten equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, edges with four equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, edges with four equivalent Al(2)Pr2Mn4Al6 cuboctahedra, faces with six equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, and faces with eight equivalent Al(2)Pr2Mn4Al6 cuboctahedra. Both Mn(1)-Mn(1) bond lengths are 2.61 Å. All Mn(1)-Al(1) bond lengths are 2.71 Å. All Mn(1)-Al(2) bond lengths are 2.59 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Pr(1), four equivalent Mn(1), one Al(1), and four equivalent Al(2) atoms. The Al(1)-Al(1) bond length is 2.84 Å. There are two shorter (2.79 Å) and two longer (2.81 Å) Al(1)-Al(2) bond lengths. In the second Al site, Al(2) is bonded to two equivalent Pr(1), four equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms to form distorted AlPr2Mn4Al6 cuboctahedra that share corners with eight equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, corners with ten equivalent Al(2)Pr2Mn4Al6 cuboctahedra, edges with three equivalent Al(2)Pr2Mn4Al6 cuboctahedra, edges with four equivalent Mn(1)Pr2Mn2Al8 cuboctahedra, faces with seven equivalent Al(2)Pr2Mn4Al6 cuboctahedra, and faces with eight equivalent Mn(1)Pr2Mn2Al8 cuboctahedra. Both Al(2)-Al(2) bond lengths are 2.88 Å.