The structure described by Pr2Se2O crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 7-coordinate geometry to two equivalent Se(2), four equivalent Se(1), and one O(1) atom. In the second Pr site, Pr(2) is bonded in a 3-coordinate geometry to one Se(1), three equivalent Se(2), and three equivalent O(1) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one Pr(2) and four equivalent Pr(1) atoms to form distorted SePr5 trigonal bipyramids that share corners with three equivalent O(1)Pr4 tetrahedra, corners with four equivalent Se(1)Pr5 trigonal bipyramids, edges with two equivalent O(1)Pr4 tetrahedra, and edges with four equivalent Se(1)Pr5 trigonal bipyramids. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to two equivalent Pr(1) and three equivalent Pr(2) atoms. O(1) is bonded to one Pr(1) and three equivalent Pr(2) atoms to form OPr4 tetrahedra that share corners with four equivalent O(1)Pr4 tetrahedra, corners with three equivalent Se(1)Pr5 trigonal bipyramids,  an edgeedge with one O(1)Pr4 tetrahedra, and edges with two equivalent Se(1)Pr5 trigonal bipyramids. is represented by the CIF card [CIF]
data_Pr2Se2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.388
_cell_length_b   7.396
_cell_length_c   8.920
_cell_angle_alpha   80.184
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   480.243
_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  Pr0  1  0.052  0.746  0.143  1.0
  Pr  Pr1  1  0.552  0.754  0.857  1.0
  Pr  Pr2  1  0.948  0.254  0.857  1.0
  Pr  Pr3  1  0.448  0.246  0.143  1.0
  Pr  Pr4  1  0.147  0.674  0.575  1.0
  Pr  Pr5  1  0.647  0.826  0.425  1.0
  Pr  Pr6  1  0.853  0.326  0.425  1.0
  Pr  Pr7  1  0.353  0.174  0.575  1.0
  Se  Se8  1  0.722  0.971  0.078  1.0
  Se  Se9  1  0.629  0.431  0.680  1.0
  Se  Se10  1  0.371  0.569  0.320  1.0
  Se  Se11  1  0.871  0.931  0.680  1.0
  Se  Se12  1  0.222  0.529  0.922  1.0
  Se  Se13  1  0.278  0.029  0.922  1.0
  Se  Se14  1  0.778  0.471  0.078  1.0
  Se  Se15  1  0.129  0.069  0.320  1.0
  O  O16  1  0.085  0.351  0.614  1.0
  O  O17  1  0.415  0.851  0.614  1.0
  O  O18  1  0.915  0.649  0.386  1.0
  O  O19  1  0.585  0.149  0.386  1.0
[/CIF]
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The structure described by Pr2Se2O crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 7-coordinate geometry to two equivalent Se(2), four equivalent Se(1), and one O(1) atom. In the second Pr site, Pr(2) is bonded in a 3-coordinate geometry to one Se(1), three equivalent Se(2), and three equivalent O(1) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one Pr(2) and four equivalent Pr(1) atoms to form distorted SePr5 trigonal bipyramids that share corners with three equivalent O(1)Pr4 tetrahedra, corners with four equivalent Se(1)Pr5 trigonal bipyramids, edges with two equivalent O(1)Pr4 tetrahedra, and edges with four equivalent Se(1)Pr5 trigonal bipyramids. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to two equivalent Pr(1) and three equivalent Pr(2) atoms. O(1) is bonded to one Pr(1) and three equivalent Pr(2) atoms to form OPr4 tetrahedra that share corners with four equivalent O(1)Pr4 tetrahedra, corners with three equivalent Se(1)Pr5 trigonal bipyramids,  an edgeedge with one O(1)Pr4 tetrahedra, and edges with two equivalent Se(1)Pr5 trigonal bipyramids. is represented by the CIF card [CIF]
data_Pr2Se2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.388
_cell_length_b   7.396
_cell_length_c   8.920
_cell_angle_alpha   80.184
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   480.243
_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  Pr0  1  0.052  0.746  0.143  1.0
  Pr  Pr1  1  0.552  0.754  0.857  1.0
  Pr  Pr2  1  0.948  0.254  0.857  1.0
  Pr  Pr3  1  0.448  0.246  0.143  1.0
  Pr  Pr4  1  0.147  0.674  0.575  1.0
  Pr  Pr5  1  0.647  0.826  0.425  1.0
  Pr  Pr6  1  0.853  0.326  0.425  1.0
  Pr  Pr7  1  0.353  0.174  0.575  1.0
  Se  Se8  1  0.722  0.971  0.078  1.0
  Se  Se9  1  0.629  0.431  0.680  1.0
  Se  Se10  1  0.371  0.569  0.320  1.0
  Se  Se11  1  0.871  0.931  0.680  1.0
  Se  Se12  1  0.222  0.529  0.922  1.0
  Se  Se13  1  0.278  0.029  0.922  1.0
  Se  Se14  1  0.778  0.471  0.078  1.0
  Se  Se15  1  0.129  0.069  0.320  1.0
  O  O16  1  0.085  0.351  0.614  1.0
  O  O17  1  0.415  0.851  0.614  1.0
  O  O18  1  0.915  0.649  0.386  1.0
  O  O19  1  0.585  0.149  0.386  1.0
[/CIF]
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