The crystal structure described by Na2Pr4O2Cl9 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded to one Cl(2), one Cl(5), two equivalent Cl(1), and two equivalent Cl(4) atoms to form a mixture of distorted edge and corner-sharing NaCl6 pentagonal pyramids. There are three inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), one Cl(5), one Cl(6), two equivalent Cl(2), and two equivalent Cl(4) atoms. In the second Pr site, Pr(2) is bonded in a 2-coordinate geometry to two equivalent O(1), one Cl(1), one Cl(3), one Cl(6), two equivalent Cl(2), and two equivalent Cl(4) atoms. In the third Pr site, Pr(3) is bonded in a 8-coordinate geometry to two equivalent O(1), one Cl(3), one Cl(5), two equivalent Cl(1), and two equivalent Cl(4) atoms. O(1) is bonded to one Pr(1), one Pr(3), and two equivalent Pr(2) atoms to form edge-sharing OPr4 tetrahedra. There are six inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a see-saw-like geometry to two equivalent Na(1), one Pr(2), and one Pr(3) atom. In the second Cl site, Cl(2) is bonded in a distorted see-saw-like geometry to one Na(1), one Pr(1), and two equivalent Pr(2) atoms. In the third Cl site, Cl(3) is bonded in a distorted T-shaped geometry to one Pr(3) and two equivalent Pr(2) atoms. In the fourth Cl site, Cl(4) is bonded in a 6-coordinate geometry to two equivalent Na(1), one Pr(1), one Pr(3), and two equivalent Pr(2) atoms. In the fifth Cl site, Cl(5) is bonded in a rectangular see-saw-like geometry to two equivalent Na(1), one Pr(1), and one Pr(3) atom. In the sixth Cl site, Cl(6) is bonded in a distorted T-shaped geometry to one Pr(1) and two equivalent Pr(2) atoms. is represented by the CIF file [CIF]
data_Na2Pr4Cl9O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.570
_cell_length_b   8.307
_cell_length_c   9.391
_cell_angle_alpha   73.102
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   863.648
_cell_formula_units_Z   2
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
  Na  Na0  1  0.985  0.771  0.433  1.0
  Na  Na1  1  0.485  0.229  0.567  1.0
  Na  Na2  1  0.015  0.229  0.567  1.0
  Na  Na3  1  0.515  0.771  0.433  1.0
  Pr  Pr4  1  0.750  0.611  0.165  1.0
  Pr  Pr5  1  0.046  0.721  0.952  1.0
  Pr  Pr6  1  0.454  0.721  0.952  1.0
  Pr  Pr7  1  0.546  0.279  0.048  1.0
  Pr  Pr8  1  0.250  0.389  0.835  1.0
  Pr  Pr9  1  0.954  0.279  0.048  1.0
  Pr  Pr10  1  0.750  0.629  0.781  1.0
  Pr  Pr11  1  0.250  0.371  0.219  1.0
  Cl  Cl12  1  0.081  0.100  0.315  1.0
  Cl  Cl13  1  0.907  0.893  0.123  1.0
  Cl  Cl14  1  0.750  0.261  0.863  1.0
  Cl  Cl15  1  0.997  0.499  0.299  1.0
  Cl  Cl16  1  0.093  0.107  0.877  1.0
  Cl  Cl17  1  0.919  0.900  0.685  1.0
  Cl  Cl18  1  0.497  0.501  0.701  1.0
  Cl  Cl19  1  0.750  0.669  0.461  1.0
  Cl  Cl20  1  0.407  0.107  0.877  1.0
  Cl  Cl21  1  0.250  0.759  0.753  1.0
  Cl  Cl22  1  0.003  0.501  0.701  1.0
  Cl  Cl23  1  0.250  0.739  0.137  1.0
  Cl  Cl24  1  0.581  0.900  0.685  1.0
  Cl  Cl25  1  0.750  0.241  0.247  1.0
  Cl  Cl26  1  0.250  0.331  0.539  1.0
  Cl  Cl27  1  0.503  0.499  0.299  1.0
  Cl  Cl28  1  0.593  0.893  0.123  1.0
  Cl  Cl29  1  0.419  0.100  0.315  1.0
  O  O30  1  0.619  0.552  0.986  1.0
  O  O31  1  0.381  0.448  0.014  1.0
  O  O32  1  0.881  0.552  0.986  1.0
  O  O33  1  0.119  0.448  0.014  1.0
[/CIF]
.
The crystal structure described by Na2Pr4O2Cl9 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded to one Cl(2), one Cl(5), two equivalent Cl(1), and two equivalent Cl(4) atoms to form a mixture of distorted edge and corner-sharing NaCl6 pentagonal pyramids. There are three inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), one Cl(5), one Cl(6), two equivalent Cl(2), and two equivalent Cl(4) atoms. In the second Pr site, Pr(2) is bonded in a 2-coordinate geometry to two equivalent O(1), one Cl(1), one Cl(3), one Cl(6), two equivalent Cl(2), and two equivalent Cl(4) atoms. In the third Pr site, Pr(3) is bonded in a 8-coordinate geometry to two equivalent O(1), one Cl(3), one Cl(5), two equivalent Cl(1), and two equivalent Cl(4) atoms. O(1) is bonded to one Pr(1), one Pr(3), and two equivalent Pr(2) atoms to form edge-sharing OPr4 tetrahedra. There are six inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a see-saw-like geometry to two equivalent Na(1), one Pr(2), and one Pr(3) atom. In the second Cl site, Cl(2) is bonded in a distorted see-saw-like geometry to one Na(1), one Pr(1), and two equivalent Pr(2) atoms. In the third Cl site, Cl(3) is bonded in a distorted T-shaped geometry to one Pr(3) and two equivalent Pr(2) atoms. In the fourth Cl site, Cl(4) is bonded in a 6-coordinate geometry to two equivalent Na(1), one Pr(1), one Pr(3), and two equivalent Pr(2) atoms. In the fifth Cl site, Cl(5) is bonded in a rectangular see-saw-like geometry to two equivalent Na(1), one Pr(1), and one Pr(3) atom. In the sixth Cl site, Cl(6) is bonded in a distorted T-shaped geometry to one Pr(1) and two equivalent Pr(2) atoms. is represented by the CIF file [CIF]
data_Na2Pr4Cl9O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.570
_cell_length_b   8.307
_cell_length_c   9.391
_cell_angle_alpha   73.102
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   863.648
_cell_formula_units_Z   2
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
  Na  Na0  1  0.985  0.771  0.433  1.0
  Na  Na1  1  0.485  0.229  0.567  1.0
  Na  Na2  1  0.015  0.229  0.567  1.0
  Na  Na3  1  0.515  0.771  0.433  1.0
  Pr  Pr4  1  0.750  0.611  0.165  1.0
  Pr  Pr5  1  0.046  0.721  0.952  1.0
  Pr  Pr6  1  0.454  0.721  0.952  1.0
  Pr  Pr7  1  0.546  0.279  0.048  1.0
  Pr  Pr8  1  0.250  0.389  0.835  1.0
  Pr  Pr9  1  0.954  0.279  0.048  1.0
  Pr  Pr10  1  0.750  0.629  0.781  1.0
  Pr  Pr11  1  0.250  0.371  0.219  1.0
  Cl  Cl12  1  0.081  0.100  0.315  1.0
  Cl  Cl13  1  0.907  0.893  0.123  1.0
  Cl  Cl14  1  0.750  0.261  0.863  1.0
  Cl  Cl15  1  0.997  0.499  0.299  1.0
  Cl  Cl16  1  0.093  0.107  0.877  1.0
  Cl  Cl17  1  0.919  0.900  0.685  1.0
  Cl  Cl18  1  0.497  0.501  0.701  1.0
  Cl  Cl19  1  0.750  0.669  0.461  1.0
  Cl  Cl20  1  0.407  0.107  0.877  1.0
  Cl  Cl21  1  0.250  0.759  0.753  1.0
  Cl  Cl22  1  0.003  0.501  0.701  1.0
  Cl  Cl23  1  0.250  0.739  0.137  1.0
  Cl  Cl24  1  0.581  0.900  0.685  1.0
  Cl  Cl25  1  0.750  0.241  0.247  1.0
  Cl  Cl26  1  0.250  0.331  0.539  1.0
  Cl  Cl27  1  0.503  0.499  0.299  1.0
  Cl  Cl28  1  0.593  0.893  0.123  1.0
  Cl  Cl29  1  0.419  0.100  0.315  1.0
  O  O30  1  0.619  0.552  0.986  1.0
  O  O31  1  0.381  0.448  0.014  1.0
  O  O32  1  0.881  0.552  0.986  1.0
  O  O33  1  0.119  0.448  0.014  1.0
[/CIF]
.