The material structure described by Pr4B4O11F2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), two equivalent O(5), two equivalent O(6), and one F(1) atom. In the second Pr site, Pr(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(5), one O(6), two equivalent O(2), and three equivalent F(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Pr(1), one Pr(2), one B(1), and one B(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Pr(1), two equivalent Pr(2), and one B(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Pr(1) and two equivalent B(1) atoms. 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(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one B(1) atom. F(1) is bonded to one Pr(1) and three equivalent Pr(2) atoms to form a mixture of distorted edge and corner-sharing FPr4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pr4B4O11F2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.437
_cell_length_b   7.437
_cell_length_c   14.126
_cell_angle_alpha   89.053
_cell_angle_beta   89.053
_cell_angle_gamma   37.395
_symmetry_Int_Tables_number   1
_cell_volume   474.443
_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  0.466  0.417  0.371  1.0
  Pr  Pr1  1  0.583  0.534  0.129  1.0
  Pr  Pr2  1  0.534  0.583  0.629  1.0
  Pr  Pr3  1  0.417  0.466  0.871  1.0
  Pr  Pr4  1  0.742  0.700  0.372  1.0
  Pr  Pr5  1  0.300  0.258  0.128  1.0
  Pr  Pr6  1  0.258  0.300  0.628  1.0
  Pr  Pr7  1  0.700  0.742  0.872  1.0
  B  B8  1  0.073  0.111  0.285  1.0
  B  B9  1  0.889  0.927  0.215  1.0
  B  B10  1  0.927  0.889  0.715  1.0
  B  B11  1  0.111  0.073  0.785  1.0
  B  B12  1  0.857  0.955  0.527  1.0
  B  B13  1  0.045  0.143  0.973  1.0
  B  B14  1  0.143  0.045  0.473  1.0
  B  B15  1  0.955  0.857  0.027  1.0
  O  O16  1  0.963  0.212  0.392  1.0
  O  O17  1  0.788  0.037  0.108  1.0
  O  O18  1  0.037  0.788  0.608  1.0
  O  O19  1  0.212  0.963  0.892  1.0
  O  O20  1  0.648  0.011  0.257  1.0
  O  O21  1  0.989  0.352  0.243  1.0
  O  O22  1  0.352  0.989  0.743  1.0
  O  O23  1  0.011  0.648  0.757  1.0
  O  O24  1  0.587  0.254  0.537  1.0
  O  O25  1  0.746  0.413  0.963  1.0
  O  O26  1  0.413  0.746  0.463  1.0
  O  O27  1  0.254  0.587  0.037  1.0
  O  O28  1  0.858  0.142  0.250  1.0
  O  O29  1  0.142  0.858  0.750  1.0
  O  O30  1  0.944  0.831  0.439  1.0
  O  O31  1  0.169  0.056  0.061  1.0
  O  O32  1  0.056  0.169  0.561  1.0
  O  O33  1  0.831  0.944  0.939  1.0
  O  O34  1  0.377  0.823  0.274  1.0
  O  O35  1  0.177  0.623  0.226  1.0
  O  O36  1  0.623  0.177  0.726  1.0
  O  O37  1  0.823  0.377  0.774  1.0
  F  F38  1  0.292  0.247  0.425  1.0
  F  F39  1  0.753  0.708  0.075  1.0
  F  F40  1  0.708  0.753  0.575  1.0
  F  F41  1  0.247  0.292  0.925  1.0
[/CIF]
.
The material structure described by Pr4B4O11F2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), two equivalent O(5), two equivalent O(6), and one F(1) atom. In the second Pr site, Pr(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(5), one O(6), two equivalent O(2), and three equivalent F(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Pr(1), one Pr(2), one B(1), and one B(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Pr(1), two equivalent Pr(2), and one B(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Pr(1) and two equivalent B(1) atoms. 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(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one B(1) atom. F(1) is bonded to one Pr(1) and three equivalent Pr(2) atoms to form a mixture of distorted edge and corner-sharing FPr4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pr4B4O11F2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.437
_cell_length_b   7.437
_cell_length_c   14.126
_cell_angle_alpha   89.053
_cell_angle_beta   89.053
_cell_angle_gamma   37.395
_symmetry_Int_Tables_number   1
_cell_volume   474.443
_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  0.466  0.417  0.371  1.0
  Pr  Pr1  1  0.583  0.534  0.129  1.0
  Pr  Pr2  1  0.534  0.583  0.629  1.0
  Pr  Pr3  1  0.417  0.466  0.871  1.0
  Pr  Pr4  1  0.742  0.700  0.372  1.0
  Pr  Pr5  1  0.300  0.258  0.128  1.0
  Pr  Pr6  1  0.258  0.300  0.628  1.0
  Pr  Pr7  1  0.700  0.742  0.872  1.0
  B  B8  1  0.073  0.111  0.285  1.0
  B  B9  1  0.889  0.927  0.215  1.0
  B  B10  1  0.927  0.889  0.715  1.0
  B  B11  1  0.111  0.073  0.785  1.0
  B  B12  1  0.857  0.955  0.527  1.0
  B  B13  1  0.045  0.143  0.973  1.0
  B  B14  1  0.143  0.045  0.473  1.0
  B  B15  1  0.955  0.857  0.027  1.0
  O  O16  1  0.963  0.212  0.392  1.0
  O  O17  1  0.788  0.037  0.108  1.0
  O  O18  1  0.037  0.788  0.608  1.0
  O  O19  1  0.212  0.963  0.892  1.0
  O  O20  1  0.648  0.011  0.257  1.0
  O  O21  1  0.989  0.352  0.243  1.0
  O  O22  1  0.352  0.989  0.743  1.0
  O  O23  1  0.011  0.648  0.757  1.0
  O  O24  1  0.587  0.254  0.537  1.0
  O  O25  1  0.746  0.413  0.963  1.0
  O  O26  1  0.413  0.746  0.463  1.0
  O  O27  1  0.254  0.587  0.037  1.0
  O  O28  1  0.858  0.142  0.250  1.0
  O  O29  1  0.142  0.858  0.750  1.0
  O  O30  1  0.944  0.831  0.439  1.0
  O  O31  1  0.169  0.056  0.061  1.0
  O  O32  1  0.056  0.169  0.561  1.0
  O  O33  1  0.831  0.944  0.939  1.0
  O  O34  1  0.377  0.823  0.274  1.0
  O  O35  1  0.177  0.623  0.226  1.0
  O  O36  1  0.623  0.177  0.726  1.0
  O  O37  1  0.823  0.377  0.774  1.0
  F  F38  1  0.292  0.247  0.425  1.0
  F  F39  1  0.753  0.708  0.075  1.0
  F  F40  1  0.708  0.753  0.575  1.0
  F  F41  1  0.247  0.292  0.925  1.0
[/CIF]
.