The structure described by Pr2MoB2O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one O(1), one O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form distorted PrO8 hexagonal bipyramids that share  a cornercorner with one Mo(1)O4 tetrahedra and edges with three equivalent Pr(1)O8 hexagonal bipyramids. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), and two equivalent O(8) atoms. Mo(1) is bonded to one O(1), one O(6), one O(7), and one O(8) atom to form MoO4 tetrahedra that share  a cornercorner with one Pr(1)O8 hexagonal bipyramid. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(9) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(2), and one Mo(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Pr(1), one Pr(2), and one B(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Pr(1) and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one B(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one B(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Pr(2) and one Mo(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Pr(2) and one Mo(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Pr(2) and one Mo(1) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one B(1) and one B(2) atom. is represented by the CIF card [CIF]
data_Pr2B2MoO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.362
_cell_length_b   7.113
_cell_length_c   10.753
_cell_angle_alpha   74.461
_cell_angle_beta   76.142
_cell_angle_gamma   73.010
_symmetry_Int_Tables_number   1
_cell_volume   372.076
_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
  Pr  Pr0  1  0.843  0.794  0.954  1.0
  Pr  Pr1  1  0.370  0.078  0.686  1.0
  Pr  Pr2  1  0.630  0.922  0.314  1.0
  Pr  Pr3  1  0.157  0.206  0.046  1.0
  B  B4  1  0.737  0.246  0.844  1.0
  B  B5  1  0.460  0.588  0.863  1.0
  B  B6  1  0.540  0.412  0.137  1.0
  B  B7  1  0.263  0.754  0.156  1.0
  Mo  Mo8  1  0.038  0.710  0.581  1.0
  Mo  Mo9  1  0.962  0.290  0.419  1.0
  O  O10  1  0.918  0.173  0.298  1.0
  O  O11  1  0.082  0.827  0.702  1.0
  O  O12  1  0.516  0.220  0.147  1.0
  O  O13  1  0.766  0.472  0.073  1.0
  O  O14  1  0.454  0.858  0.139  1.0
  O  O15  1  0.234  0.528  0.927  1.0
  O  O16  1  0.989  0.134  0.866  1.0
  O  O17  1  0.855  0.558  0.376  1.0
  O  O18  1  0.240  0.790  0.430  1.0
  O  O19  1  0.695  0.819  0.554  1.0
  O  O20  1  0.011  0.866  0.134  1.0
  O  O21  1  0.546  0.142  0.861  1.0
  O  O22  1  0.145  0.442  0.624  1.0
  O  O23  1  0.687  0.454  0.814  1.0
  O  O24  1  0.484  0.780  0.853  1.0
  O  O25  1  0.305  0.181  0.446  1.0
  O  O26  1  0.760  0.210  0.570  1.0
  O  O27  1  0.313  0.546  0.186  1.0
[/CIF]
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The structure described by Pr2MoB2O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one O(1), one O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form distorted PrO8 hexagonal bipyramids that share  a cornercorner with one Mo(1)O4 tetrahedra and edges with three equivalent Pr(1)O8 hexagonal bipyramids. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), and two equivalent O(8) atoms. Mo(1) is bonded to one O(1), one O(6), one O(7), and one O(8) atom to form MoO4 tetrahedra that share  a cornercorner with one Pr(1)O8 hexagonal bipyramid. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(9) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(2), and one Mo(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Pr(1), one Pr(2), and one B(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Pr(1) and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one B(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one B(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Pr(2) and one Mo(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Pr(2) and one Mo(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Pr(2) and one Mo(1) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one B(1) and one B(2) atom. is represented by the CIF card [CIF]
data_Pr2B2MoO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.362
_cell_length_b   7.113
_cell_length_c   10.753
_cell_angle_alpha   74.461
_cell_angle_beta   76.142
_cell_angle_gamma   73.010
_symmetry_Int_Tables_number   1
_cell_volume   372.076
_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
  Pr  Pr0  1  0.843  0.794  0.954  1.0
  Pr  Pr1  1  0.370  0.078  0.686  1.0
  Pr  Pr2  1  0.630  0.922  0.314  1.0
  Pr  Pr3  1  0.157  0.206  0.046  1.0
  B  B4  1  0.737  0.246  0.844  1.0
  B  B5  1  0.460  0.588  0.863  1.0
  B  B6  1  0.540  0.412  0.137  1.0
  B  B7  1  0.263  0.754  0.156  1.0
  Mo  Mo8  1  0.038  0.710  0.581  1.0
  Mo  Mo9  1  0.962  0.290  0.419  1.0
  O  O10  1  0.918  0.173  0.298  1.0
  O  O11  1  0.082  0.827  0.702  1.0
  O  O12  1  0.516  0.220  0.147  1.0
  O  O13  1  0.766  0.472  0.073  1.0
  O  O14  1  0.454  0.858  0.139  1.0
  O  O15  1  0.234  0.528  0.927  1.0
  O  O16  1  0.989  0.134  0.866  1.0
  O  O17  1  0.855  0.558  0.376  1.0
  O  O18  1  0.240  0.790  0.430  1.0
  O  O19  1  0.695  0.819  0.554  1.0
  O  O20  1  0.011  0.866  0.134  1.0
  O  O21  1  0.546  0.142  0.861  1.0
  O  O22  1  0.145  0.442  0.624  1.0
  O  O23  1  0.687  0.454  0.814  1.0
  O  O24  1  0.484  0.780  0.853  1.0
  O  O25  1  0.305  0.181  0.446  1.0
  O  O26  1  0.760  0.210  0.570  1.0
  O  O27  1  0.313  0.546  0.186  1.0
[/CIF]
.