The structure described by Sr2P7Br crystallizes in the cubic P2_13 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one P(1), three equivalent P(2), three equivalent P(3), and three equivalent Br(1) atoms. In the second Sr site, Sr(2) is bonded in a 13-coordinate geometry to six equivalent P(2), six equivalent P(3), and one Br(1) atom. There are three inequivalent P sites. In the first P site, P(1) is bonded to one Sr(1) and three equivalent P(2) atoms to form PSrP3 tetrahedra that share corners with three equivalent P(2)Sr3P2 trigonal bipyramids and corners with three equivalent Br(1)Sr4 trigonal pyramids. In the second P site, P(2) is bonded to one Sr(1), two equivalent Sr(2), one P(1), and one P(3) atom to form distorted PSr3P2 trigonal bipyramids that share  a cornercorner with one P(1)SrP3 tetrahedra, corners with six equivalent P(2)Sr3P2 trigonal bipyramids, corners with three equivalent Br(1)Sr4 trigonal pyramids, edges with four equivalent P(2)Sr3P2 trigonal bipyramids, and  an edgeedge with one Br(1)Sr4 trigonal pyramid. In the third P site, P(3) is bonded in a 6-coordinate geometry to one Sr(1), two equivalent Sr(2), one P(2), and two equivalent P(3) atoms. Br(1) is bonded to one Sr(2) and three equivalent Sr(1) atoms to form BrSr4 trigonal pyramids that share corners with three equivalent P(1)SrP3 tetrahedra, corners with nine equivalent P(2)Sr3P2 trigonal bipyramids, corners with six equivalent Br(1)Sr4 trigonal pyramids, and edges with three equivalent P(2)Sr3P2 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2P7Br
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.890
_cell_length_b   9.890
_cell_length_c   9.890
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   967.312
_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
  Sr  Sr0  1  0.648  0.148  0.352  1.0
  Sr  Sr1  1  0.148  0.352  0.648  1.0
  Sr  Sr2  1  0.352  0.648  0.148  1.0
  Sr  Sr3  1  0.852  0.852  0.852  1.0
  Sr  Sr4  1  0.913  0.413  0.087  1.0
  Sr  Sr5  1  0.413  0.087  0.913  1.0
  Sr  Sr6  1  0.087  0.913  0.413  1.0
  Sr  Sr7  1  0.587  0.587  0.587  1.0
  P  P8  1  0.463  0.963  0.537  1.0
  P  P9  1  0.963  0.537  0.463  1.0
  P  P10  1  0.537  0.463  0.963  1.0
  P  P11  1  0.037  0.037  0.037  1.0
  P  P12  1  0.218  0.944  0.119  1.0
  P  P13  1  0.881  0.718  0.556  1.0
  P  P14  1  0.444  0.381  0.782  1.0
  P  P15  1  0.718  0.556  0.881  1.0
  P  P16  1  0.381  0.782  0.444  1.0
  P  P17  1  0.944  0.119  0.218  1.0
  P  P18  1  0.782  0.444  0.381  1.0
  P  P19  1  0.119  0.218  0.944  1.0
  P  P20  1  0.556  0.881  0.718  1.0
  P  P21  1  0.282  0.056  0.619  1.0
  P  P22  1  0.619  0.282  0.056  1.0
  P  P23  1  0.056  0.619  0.282  1.0
  P  P24  1  0.202  0.887  0.731  1.0
  P  P25  1  0.269  0.702  0.613  1.0
  P  P26  1  0.387  0.769  0.798  1.0
  P  P27  1  0.702  0.613  0.269  1.0
  P  P28  1  0.769  0.798  0.387  1.0
  P  P29  1  0.887  0.731  0.202  1.0
  P  P30  1  0.798  0.387  0.769  1.0
  P  P31  1  0.731  0.202  0.887  1.0
  P  P32  1  0.613  0.269  0.702  1.0
  P  P33  1  0.298  0.113  0.231  1.0
  P  P34  1  0.231  0.298  0.113  1.0
  P  P35  1  0.113  0.231  0.298  1.0
  Br  Br36  1  0.097  0.597  0.903  1.0
  Br  Br37  1  0.597  0.903  0.097  1.0
  Br  Br38  1  0.903  0.097  0.597  1.0
  Br  Br39  1  0.403  0.403  0.403  1.0
[/CIF]
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The structure described by Sr2P7Br crystallizes in the cubic P2_13 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one P(1), three equivalent P(2), three equivalent P(3), and three equivalent Br(1) atoms. In the second Sr site, Sr(2) is bonded in a 13-coordinate geometry to six equivalent P(2), six equivalent P(3), and one Br(1) atom. There are three inequivalent P sites. In the first P site, P(1) is bonded to one Sr(1) and three equivalent P(2) atoms to form PSrP3 tetrahedra that share corners with three equivalent P(2)Sr3P2 trigonal bipyramids and corners with three equivalent Br(1)Sr4 trigonal pyramids. In the second P site, P(2) is bonded to one Sr(1), two equivalent Sr(2), one P(1), and one P(3) atom to form distorted PSr3P2 trigonal bipyramids that share  a cornercorner with one P(1)SrP3 tetrahedra, corners with six equivalent P(2)Sr3P2 trigonal bipyramids, corners with three equivalent Br(1)Sr4 trigonal pyramids, edges with four equivalent P(2)Sr3P2 trigonal bipyramids, and  an edgeedge with one Br(1)Sr4 trigonal pyramid. In the third P site, P(3) is bonded in a 6-coordinate geometry to one Sr(1), two equivalent Sr(2), one P(2), and two equivalent P(3) atoms. Br(1) is bonded to one Sr(2) and three equivalent Sr(1) atoms to form BrSr4 trigonal pyramids that share corners with three equivalent P(1)SrP3 tetrahedra, corners with nine equivalent P(2)Sr3P2 trigonal bipyramids, corners with six equivalent Br(1)Sr4 trigonal pyramids, and edges with three equivalent P(2)Sr3P2 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2P7Br
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.890
_cell_length_b   9.890
_cell_length_c   9.890
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   967.312
_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
  Sr  Sr0  1  0.648  0.148  0.352  1.0
  Sr  Sr1  1  0.148  0.352  0.648  1.0
  Sr  Sr2  1  0.352  0.648  0.148  1.0
  Sr  Sr3  1  0.852  0.852  0.852  1.0
  Sr  Sr4  1  0.913  0.413  0.087  1.0
  Sr  Sr5  1  0.413  0.087  0.913  1.0
  Sr  Sr6  1  0.087  0.913  0.413  1.0
  Sr  Sr7  1  0.587  0.587  0.587  1.0
  P  P8  1  0.463  0.963  0.537  1.0
  P  P9  1  0.963  0.537  0.463  1.0
  P  P10  1  0.537  0.463  0.963  1.0
  P  P11  1  0.037  0.037  0.037  1.0
  P  P12  1  0.218  0.944  0.119  1.0
  P  P13  1  0.881  0.718  0.556  1.0
  P  P14  1  0.444  0.381  0.782  1.0
  P  P15  1  0.718  0.556  0.881  1.0
  P  P16  1  0.381  0.782  0.444  1.0
  P  P17  1  0.944  0.119  0.218  1.0
  P  P18  1  0.782  0.444  0.381  1.0
  P  P19  1  0.119  0.218  0.944  1.0
  P  P20  1  0.556  0.881  0.718  1.0
  P  P21  1  0.282  0.056  0.619  1.0
  P  P22  1  0.619  0.282  0.056  1.0
  P  P23  1  0.056  0.619  0.282  1.0
  P  P24  1  0.202  0.887  0.731  1.0
  P  P25  1  0.269  0.702  0.613  1.0
  P  P26  1  0.387  0.769  0.798  1.0
  P  P27  1  0.702  0.613  0.269  1.0
  P  P28  1  0.769  0.798  0.387  1.0
  P  P29  1  0.887  0.731  0.202  1.0
  P  P30  1  0.798  0.387  0.769  1.0
  P  P31  1  0.731  0.202  0.887  1.0
  P  P32  1  0.613  0.269  0.702  1.0
  P  P33  1  0.298  0.113  0.231  1.0
  P  P34  1  0.231  0.298  0.113  1.0
  P  P35  1  0.113  0.231  0.298  1.0
  Br  Br36  1  0.097  0.597  0.903  1.0
  Br  Br37  1  0.597  0.903  0.097  1.0
  Br  Br38  1  0.903  0.097  0.597  1.0
  Br  Br39  1  0.403  0.403  0.403  1.0
[/CIF]
.