data_Pr2Se2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.91
_cell_length_b   7.39
_cell_length_c   7.38
_cell_angle_alpha   90.0
_cell_angle_beta   99.88
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Pr2Se2O
_chemical_formula_sum   'Pr8 Se8 O4'
_cell_volume   479.11
_cell_formula_units_Z   4
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  Pr4  1  0.39  0.61  0.91  1.0
  Pr  Pr5  1  0.24  0.31  0.43  1.0
  Pr  Pr6  1  0.76  0.0  0.48  1.0
  Pr  Pr7  1  0.62  0.3  0.01  1.0
  Pr  Pr8  1  0.02  0.09  0.27  1.0
  Pr  Pr9  1  0.88  0.39  0.79  1.0
  Pr  Pr10  1  0.4  0.09  0.85  1.0
  Pr  Pr11  1  0.25  0.79  0.37  1.0
  Se  Se12  1  0.48  0.05  0.85  1.0
  Se  Se13  1  0.89  0.95  0.14  1.0
  Se  Se14  1  0.12  0.65  0.77  1.0
  Se  Se15  1  0.53  0.75  0.07  1.0
  Se  Se16  1  0.11  0.65  0.21  1.0
  Se  Se17  1  0.52  0.74  0.5  1.0
  Se  Se18  1  0.75  0.44  0.14  1.0
  Se  Se19  1  0.16  0.34  0.43  1.0
  O  O0  1  0.19  0.33  0.72  1.0
  O  O1  1  0.81  0.63  0.19  1.0
  O  O2  1  0.83  0.76  0.08  1.0
  O  O3  1  0.45  0.07  0.55  1.0

data_Pr2Se2O
_symmetry_space_group_name_H-M   P-1
_cell_length_a   7.38
_cell_length_b   7.39
_cell_length_c   8.91
_cell_angle_alpha   90.0
_cell_angle_beta   99.88
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Pr2Se2O
_chemical_formula_sum   'Pr8 Se8 O4'
_cell_volume   479.11
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  2  0.15  0.69  0.06  1.0
  Pr  Pr1  2  0.21  0.39  0.58  1.0
  Pr  Pr2  2  0.27  0.91  0.57  1.0
  Pr  Pr3  2  0.37  0.61  0.8  1.0
  Se  Se4  2  0.14  0.95  0.3  1.0
  Se  Se5  2  0.21  0.35  0.66  1.0
  Se  Se6  2  0.43  0.05  0.71  1.0
  Se  Se7  2  0.5  0.74  0.93  1.0
  O  O8  2  0.08  0.63  0.37  1.0
  O  O9  2  0.45  0.07  0.01  1.0

Pr Pr Pr Pr Pr Pr Pr Pr Se Se Se Se Se Se Se Se O O O O
Pr2Se2O crystallizes in the triclinic P-1 space group. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 1-coordinate geometry to one Se(4), two equivalent Se(3), and one O(1) atom. The Pr(1)-Se(4) bond length is 1.88 Å. There is one shorter (2.47 Å) and one longer (3.54 Å) Pr(1)-Se(3) bond length. The Pr(1)-O(1) bond length is 2.89 Å. In the second Pr site, Pr(2) is bonded in a single-bond geometry to one Se(1) and two equivalent O(1) atoms. The Pr(2)-Se(1) bond length is 0.76 Å. There is one shorter (2.29 Å) and one longer (2.58 Å) Pr(2)-O(1) bond length. In the third Pr site, Pr(3) is bonded in a 3-coordinate geometry to one Se(2), one Se(3), and one O(1) atom. The Pr(3)-Se(2) bond length is 2.97 Å. The Pr(3)-Se(3) bond length is 2.91 Å. The Pr(3)-O(1) bond length is 3.00 Å. In the fourth Pr site, Pr(4) is bonded in a 2-coordinate geometry to one Se(1) and one Se(2) atom. The Pr(4)-Se(1) bond length is 2.43 Å. The Pr(4)-Se(2) bond length is 1.74 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a single-bond geometry to one Pr(2), one Pr(4), and one O(1) atom. The Se(1)-O(1) bond length is 2.13 Å. In the second Se site, Se(2) is bonded in a distorted bent 150 degrees geometry to one Pr(3), one Pr(4), and one O(2) atom. The Se(2)-O(2) bond length is 1.52 Å. In the third Se site, Se(3) is bonded in a 4-coordinate geometry to one Pr(3), two equivalent Pr(1), and one O(1) atom. The Se(3)-O(1) bond length is 2.53 Å. In the fourth Se site, Se(4) is bonded in a single-bond geometry to one Pr(1) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Pr(1), one Pr(3), two equivalent Pr(2), one Se(1), and one Se(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Se(2) and one O(2) atom. The O(2)-O(2) bond length is 1.29 Å.