Pr7Co6Al7 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a body-centered cubic geometry to eight equivalent Al(3) atoms. In the second Pr site, Pr(2) is bonded in a 11-coordinate geometry to two equivalent Co(1), four equivalent Co(2), one Al(2), two equivalent Al(1), and two equivalent Al(3) atoms. In the third Pr site, Pr(3) is bonded in a 1-coordinate geometry to two equivalent Co(1), two equivalent Co(2), two equivalent Al(2), and four equivalent Al(3) atoms. There are two inequivalent Co sites. In the first Co site, Co(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), one Co(2), two equivalent Al(2), and two equivalent Al(3) atoms. In the second Co site, Co(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), four equivalent Pr(3), one Al(2), and two equivalent Al(1) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Pr(2) and four equivalent Co(1) atoms to form distorted AlPr4Co4 cuboctahedra that share corners with eight equivalent Al(2)Pr5Al2Co5 cuboctahedra and faces with two equivalent Al(1)Pr4Co4 cuboctahedra. In the second Al site, Al(2) is bonded to one Pr(2), four equivalent Pr(3), one Co(1), four equivalent Co(2), and two equivalent Al(3) atoms to form distorted AlPr5Al2Co5 cuboctahedra that share corners with four equivalent Al(1)Pr4Co4 cuboctahedra and faces with two equivalent Al(2)Pr5Al2Co5 cuboctahedra. In the third Al site, Al(3) is bonded in a 10-coordinate geometry to one Pr(2), two equivalent Pr(1), four equivalent Pr(3), two equivalent Co(2), and one Al(2) atom.
Pr7Co6Al7 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a body-centered cubic geometry to eight equivalent Al(3) atoms. All Pr(1)-Al(3) bond lengths are 3.18 Å. In the second Pr site, Pr(2) is bonded in a 11-coordinate geometry to two equivalent Co(1), four equivalent Co(2), one Al(2), two equivalent Al(1), and two equivalent Al(3) atoms. Both Pr(2)-Co(1) bond lengths are 2.97 Å. All Pr(2)-Co(2) bond lengths are 3.07 Å. The Pr(2)-Al(2) bond length is 3.03 Å. Both Pr(2)-Al(1) bond lengths are 3.34 Å. Both Pr(2)-Al(3) bond lengths are 3.22 Å. In the third Pr site, Pr(3) is bonded in a 1-coordinate geometry to two equivalent Co(1), two equivalent Co(2), two equivalent Al(2), and four equivalent Al(3) atoms. Both Pr(3)-Co(1) bond lengths are 3.14 Å. There is one shorter (2.65 Å) and one longer (3.06 Å) Pr(3)-Co(2) bond length. Both Pr(3)-Al(2) bond lengths are 3.15 Å. There are two shorter (3.34 Å) and two longer (3.39 Å) Pr(3)-Al(3) bond lengths. There are two inequivalent Co sites. In the first Co site, Co(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), one Co(2), two equivalent Al(2), and two equivalent Al(3) atoms. The Co(2)-Co(2) bond length is 2.43 Å. Both Co(2)-Al(2) bond lengths are 2.68 Å. Both Co(2)-Al(3) bond lengths are 2.50 Å. In the second Co site, Co(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), four equivalent Pr(3), one Al(2), and two equivalent Al(1) atoms. The Co(1)-Al(2) bond length is 2.80 Å. Both Co(1)-Al(1) bond lengths are 2.54 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Pr(2) and four equivalent Co(1) atoms to form distorted AlPr4Co4 cuboctahedra that share corners with eight equivalent Al(2)Pr5Al2Co5 cuboctahedra and faces with two equivalent Al(1)Pr4Co4 cuboctahedra. In the second Al site, Al(2) is bonded to one Pr(2), four equivalent Pr(3), one Co(1), four equivalent Co(2), and two equivalent Al(3) atoms to form distorted AlPr5Al2Co5 cuboctahedra that share corners with four equivalent Al(1)Pr4Co4 cuboctahedra and faces with two equivalent Al(2)Pr5Al2Co5 cuboctahedra. Both Al(2)-Al(3) bond lengths are 2.80 Å. In the third Al site, Al(3) is bonded in a 10-coordinate geometry to one Pr(2), two equivalent Pr(1), four equivalent Pr(3), two equivalent Co(2), and one Al(2) atom.