The crystal structure described by Pr3(Cu2Al7)4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 20-coordinate geometry to one Cu(1), four equivalent Cu(2), one Al(7), one Al(8), one Al(9), two equivalent Al(1), two equivalent Al(3), four equivalent Al(4), and four equivalent Al(5) atoms. In the second Pr site, Pr(2) is bonded in a 20-coordinate geometry to two equivalent Cu(1), four equivalent Cu(3), two equivalent Al(8), four equivalent Al(2), and eight equivalent Al(6) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Al(1), two equivalent Al(3), two equivalent Al(4), and two equivalent Al(5) atoms. In the second Cu site, Cu(3) is bonded in a 12-coordinate geometry to two equivalent Pr(2), two equivalent Cu(3), four equivalent Al(2), and four equivalent Al(6) atoms. In the third Cu site, Cu(1) is bonded to one Pr(1), one Pr(2), two equivalent Al(2), two equivalent Al(3), two equivalent Al(5), two equivalent Al(6), and two equivalent Al(8) atoms to form distorted CuPr2Al10 cuboctahedra that share  a cornercorner with one Al(7)Pr2Al10 cuboctahedra,  a cornercorner with one Al(9)Pr2Al10 cuboctahedra,  a cornercorner with one Al(8)Pr2Al8Cu2 cuboctahedra, corners with three equivalent Cu(1)Pr2Al10 cuboctahedra, and faces with two equivalent Al(8)Pr2Al8Cu2 cuboctahedra. There are nine inequivalent Al sites. In the first Al site, Al(9) is bonded to two equivalent Pr(1), two equivalent Al(7), four equivalent Al(1), and four equivalent Al(4) atoms to form AlPr2Al10 cuboctahedra that share corners with two equivalent Cu(1)Pr2Al10 cuboctahedra, corners with two equivalent Al(9)Pr2Al10 cuboctahedra, corners with two equivalent Al(8)Pr2Al8Cu2 cuboctahedra, and faces with two equivalent Al(7)Pr2Al10 cuboctahedra. In the second Al site, Al(1) is bonded in a 10-coordinate geometry to one Pr(1), two equivalent Cu(2), one Al(1), one Al(7), one Al(9), and four equivalent Al(4) atoms. In the third Al site, Al(2) is bonded in a 10-coordinate geometry to one Pr(2), one Cu(1), two equivalent Cu(3), one Al(3), one Al(5), one Al(8), and three equivalent Al(6) atoms. In the fourth Al site, Al(3) is bonded in a 10-coordinate geometry to one Pr(1), one Cu(1), two equivalent Cu(2), one Al(2), one Al(6), one Al(8), and three equivalent Al(5) atoms. In the fifth Al site, Al(4) is bonded in a 2-coordinate geometry to two equivalent Pr(1), two equivalent Cu(2), one Al(7), one Al(9), and four equivalent Al(1) atoms. In the sixth Al site, Al(5) is bonded in a 3-coordinate geometry to two equivalent Pr(1), one Cu(1), two equivalent Cu(2), one Al(2), one Al(8), and three equivalent Al(3) atoms. In the seventh Al site, Al(6) is bonded in a 3-coordinate geometry to two equivalent Pr(2), one Cu(1), two equivalent Cu(3), one Al(3), one Al(8), and three equivalent Al(2) atoms. In the eighth Al site, Al(7) is bonded to two equivalent Pr(1), two equivalent Al(9), four equivalent Al(1), and four equivalent Al(4) atoms to form AlPr2Al10 cuboctahedra that share corners with two equivalent Cu(1)Pr2Al10 cuboctahedra, corners with two equivalent Al(7)Pr2Al10 cuboctahedra, corners with two equivalent Al(8)Pr2Al8Cu2 cuboctahedra, and faces with two equivalent Al(9)Pr2Al10 cuboctahedra. In the ninth Al site, Al(8) is bonded to one Pr(1), one Pr(2), two equivalent Cu(1), two equivalent Al(2), two equivalent Al(3), two equivalent Al(5), and two equivalent Al(6) atoms to form distorted AlPr2Al8Cu2 cuboctahedra that share  a cornercorner with one Cu(1)Pr2Al10 cuboctahedra,  a cornercorner with one Al(7)Pr2Al10 cuboctahedra,  a cornercorner with one Al(9)Pr2Al10 cuboctahedra, corners with three equivalent Al(8)Pr2Al8Cu2 cuboctahedra, and faces with two equivalent Cu(1)Pr2Al10 cuboctahedra. is represented by the CIF card [CIF]
data_Pr3(Al7Cu2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.110
_cell_length_b   7.110
_cell_length_c   18.922
_cell_angle_alpha   87.470
_cell_angle_beta   87.470
_cell_angle_gamma   137.323
_symmetry_Int_Tables_number   1
_cell_volume   643.611
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Pr  Pr0  1  0.330  0.330  0.834  1.0
  Pr  Pr1  1  0.670  0.670  0.166  1.0
  Pr  Pr2  1  0.000  0.000  0.500  1.0
  Al  Al3  1  0.903  0.541  0.051  1.0
  Al  Al4  1  0.235  0.877  0.384  1.0
  Al  Al5  1  0.567  0.210  0.717  1.0
  Al  Al6  1  0.097  0.459  0.949  1.0
  Al  Al7  1  0.433  0.790  0.283  1.0
  Al  Al8  1  0.765  0.123  0.616  1.0
  Al  Al9  1  0.459  0.097  0.949  1.0
  Al  Al10  1  0.790  0.433  0.283  1.0
  Al  Al11  1  0.123  0.765  0.616  1.0
  Al  Al12  1  0.541  0.903  0.051  1.0
  Al  Al13  1  0.877  0.235  0.384  1.0
  Al  Al14  1  0.210  0.567  0.717  1.0
  Al  Al15  1  0.681  0.913  0.905  1.0
  Al  Al16  1  0.023  0.249  0.241  1.0
  Al  Al17  1  0.357  0.583  0.573  1.0
  Al  Al18  1  0.319  0.087  0.095  1.0
  Al  Al19  1  0.643  0.417  0.427  1.0
  Al  Al20  1  0.977  0.751  0.759  1.0
  Al  Al21  1  0.087  0.319  0.095  1.0
  Al  Al22  1  0.417  0.643  0.427  1.0
  Al  Al23  1  0.751  0.977  0.759  1.0
  Al  Al24  1  0.913  0.681  0.905  1.0
  Al  Al25  1  0.249  0.023  0.241  1.0
  Al  Al26  1  0.583  0.357  0.573  1.0
  Al  Al27  1  0.500  0.500  0.000  1.0
  Al  Al28  1  0.833  0.833  0.334  1.0
  Al  Al29  1  0.167  0.167  0.666  1.0
  Al  Al30  1  0.000  0.000  0.000  1.0
  Cu  Cu31  1  0.334  0.334  0.334  1.0
  Cu  Cu32  1  0.666  0.666  0.666  1.0
  Cu  Cu33  1  0.667  0.168  0.168  1.0
  Cu  Cu34  1  0.000  0.500  0.500  1.0
  Cu  Cu35  1  0.333  0.832  0.832  1.0
  Cu  Cu36  1  0.168  0.667  0.168  1.0
  Cu  Cu37  1  0.500  0.000  0.500  1.0
  Cu  Cu38  1  0.832  0.333  0.832  1.0
[/CIF]
.
The crystal structure described by Pr3(Cu2Al7)4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 20-coordinate geometry to one Cu(1), four equivalent Cu(2), one Al(7), one Al(8), one Al(9), two equivalent Al(1), two equivalent Al(3), four equivalent Al(4), and four equivalent Al(5) atoms. In the second Pr site, Pr(2) is bonded in a 20-coordinate geometry to two equivalent Cu(1), four equivalent Cu(3), two equivalent Al(8), four equivalent Al(2), and eight equivalent Al(6) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Al(1), two equivalent Al(3), two equivalent Al(4), and two equivalent Al(5) atoms. In the second Cu site, Cu(3) is bonded in a 12-coordinate geometry to two equivalent Pr(2), two equivalent Cu(3), four equivalent Al(2), and four equivalent Al(6) atoms. In the third Cu site, Cu(1) is bonded to one Pr(1), one Pr(2), two equivalent Al(2), two equivalent Al(3), two equivalent Al(5), two equivalent Al(6), and two equivalent Al(8) atoms to form distorted CuPr2Al10 cuboctahedra that share  a cornercorner with one Al(7)Pr2Al10 cuboctahedra,  a cornercorner with one Al(9)Pr2Al10 cuboctahedra,  a cornercorner with one Al(8)Pr2Al8Cu2 cuboctahedra, corners with three equivalent Cu(1)Pr2Al10 cuboctahedra, and faces with two equivalent Al(8)Pr2Al8Cu2 cuboctahedra. There are nine inequivalent Al sites. In the first Al site, Al(9) is bonded to two equivalent Pr(1), two equivalent Al(7), four equivalent Al(1), and four equivalent Al(4) atoms to form AlPr2Al10 cuboctahedra that share corners with two equivalent Cu(1)Pr2Al10 cuboctahedra, corners with two equivalent Al(9)Pr2Al10 cuboctahedra, corners with two equivalent Al(8)Pr2Al8Cu2 cuboctahedra, and faces with two equivalent Al(7)Pr2Al10 cuboctahedra. In the second Al site, Al(1) is bonded in a 10-coordinate geometry to one Pr(1), two equivalent Cu(2), one Al(1), one Al(7), one Al(9), and four equivalent Al(4) atoms. In the third Al site, Al(2) is bonded in a 10-coordinate geometry to one Pr(2), one Cu(1), two equivalent Cu(3), one Al(3), one Al(5), one Al(8), and three equivalent Al(6) atoms. In the fourth Al site, Al(3) is bonded in a 10-coordinate geometry to one Pr(1), one Cu(1), two equivalent Cu(2), one Al(2), one Al(6), one Al(8), and three equivalent Al(5) atoms. In the fifth Al site, Al(4) is bonded in a 2-coordinate geometry to two equivalent Pr(1), two equivalent Cu(2), one Al(7), one Al(9), and four equivalent Al(1) atoms. In the sixth Al site, Al(5) is bonded in a 3-coordinate geometry to two equivalent Pr(1), one Cu(1), two equivalent Cu(2), one Al(2), one Al(8), and three equivalent Al(3) atoms. In the seventh Al site, Al(6) is bonded in a 3-coordinate geometry to two equivalent Pr(2), one Cu(1), two equivalent Cu(3), one Al(3), one Al(8), and three equivalent Al(2) atoms. In the eighth Al site, Al(7) is bonded to two equivalent Pr(1), two equivalent Al(9), four equivalent Al(1), and four equivalent Al(4) atoms to form AlPr2Al10 cuboctahedra that share corners with two equivalent Cu(1)Pr2Al10 cuboctahedra, corners with two equivalent Al(7)Pr2Al10 cuboctahedra, corners with two equivalent Al(8)Pr2Al8Cu2 cuboctahedra, and faces with two equivalent Al(9)Pr2Al10 cuboctahedra. In the ninth Al site, Al(8) is bonded to one Pr(1), one Pr(2), two equivalent Cu(1), two equivalent Al(2), two equivalent Al(3), two equivalent Al(5), and two equivalent Al(6) atoms to form distorted AlPr2Al8Cu2 cuboctahedra that share  a cornercorner with one Cu(1)Pr2Al10 cuboctahedra,  a cornercorner with one Al(7)Pr2Al10 cuboctahedra,  a cornercorner with one Al(9)Pr2Al10 cuboctahedra, corners with three equivalent Al(8)Pr2Al8Cu2 cuboctahedra, and faces with two equivalent Cu(1)Pr2Al10 cuboctahedra. is represented by the CIF card [CIF]
data_Pr3(Al7Cu2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.110
_cell_length_b   7.110
_cell_length_c   18.922
_cell_angle_alpha   87.470
_cell_angle_beta   87.470
_cell_angle_gamma   137.323
_symmetry_Int_Tables_number   1
_cell_volume   643.611
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Pr  Pr0  1  0.330  0.330  0.834  1.0
  Pr  Pr1  1  0.670  0.670  0.166  1.0
  Pr  Pr2  1  0.000  0.000  0.500  1.0
  Al  Al3  1  0.903  0.541  0.051  1.0
  Al  Al4  1  0.235  0.877  0.384  1.0
  Al  Al5  1  0.567  0.210  0.717  1.0
  Al  Al6  1  0.097  0.459  0.949  1.0
  Al  Al7  1  0.433  0.790  0.283  1.0
  Al  Al8  1  0.765  0.123  0.616  1.0
  Al  Al9  1  0.459  0.097  0.949  1.0
  Al  Al10  1  0.790  0.433  0.283  1.0
  Al  Al11  1  0.123  0.765  0.616  1.0
  Al  Al12  1  0.541  0.903  0.051  1.0
  Al  Al13  1  0.877  0.235  0.384  1.0
  Al  Al14  1  0.210  0.567  0.717  1.0
  Al  Al15  1  0.681  0.913  0.905  1.0
  Al  Al16  1  0.023  0.249  0.241  1.0
  Al  Al17  1  0.357  0.583  0.573  1.0
  Al  Al18  1  0.319  0.087  0.095  1.0
  Al  Al19  1  0.643  0.417  0.427  1.0
  Al  Al20  1  0.977  0.751  0.759  1.0
  Al  Al21  1  0.087  0.319  0.095  1.0
  Al  Al22  1  0.417  0.643  0.427  1.0
  Al  Al23  1  0.751  0.977  0.759  1.0
  Al  Al24  1  0.913  0.681  0.905  1.0
  Al  Al25  1  0.249  0.023  0.241  1.0
  Al  Al26  1  0.583  0.357  0.573  1.0
  Al  Al27  1  0.500  0.500  0.000  1.0
  Al  Al28  1  0.833  0.833  0.334  1.0
  Al  Al29  1  0.167  0.167  0.666  1.0
  Al  Al30  1  0.000  0.000  0.000  1.0
  Cu  Cu31  1  0.334  0.334  0.334  1.0
  Cu  Cu32  1  0.666  0.666  0.666  1.0
  Cu  Cu33  1  0.667  0.168  0.168  1.0
  Cu  Cu34  1  0.000  0.500  0.500  1.0
  Cu  Cu35  1  0.333  0.832  0.832  1.0
  Cu  Cu36  1  0.168  0.667  0.168  1.0
  Cu  Cu37  1  0.500  0.000  0.500  1.0
  Cu  Cu38  1  0.832  0.333  0.832  1.0
[/CIF]
.