The structure described by Sr7Re4O19 crystallizes in the monoclinic C2/m space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), two equivalent O(5), two equivalent O(7), three equivalent O(2), and four equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra,  a cornercorner with one Re(2)O6 octahedra, corners with two equivalent Re(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, faces with two equivalent Re(1)O6 octahedra, and faces with two equivalent Re(2)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the third Sr site, Sr(3) is bonded to two equivalent O(1), two equivalent O(2), four equivalent O(5), and four equivalent O(6) atoms to form SrO12 cuboctahedra that share corners with two equivalent Sr(3)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Re(2)O6 octahedra, and faces with four equivalent Re(1)O6 octahedra. In the fourth Sr site, Sr(4) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and four equivalent O(7) atoms. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form ReO6 octahedra that share corners with two equivalent Sr(1)O12 cuboctahedra,  a cornercorner with one Re(1)O6 octahedra, corners with two equivalent Re(2)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Sr(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-9°. In the second Re site, Re(2) is bonded to one O(2), one O(4), two equivalent O(5), and two equivalent O(7) atoms to form ReO6 octahedra that share  a cornercorner with one Sr(1)O12 cuboctahedra, corners with two equivalent Re(1)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 9°. There are seven inequivalent O sites. In the first O site, O(6) is bonded to one Sr(2), one Sr(3), two equivalent Sr(1), and one Re(1) atom to form a mixture of distorted face, corner, and edge-sharing OSr4Re square pyramids. In the second O site, O(7) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(2), two equivalent Sr(4), and one Re(2) atom. In the third O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(3), and two equivalent Re(1) atoms. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one Sr(3), three equivalent Sr(1), and one Re(2) atom. In the fifth O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), and one Re(1) atom. In the sixth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), and one Re(2) atom. In the seventh O site, O(5) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Re(1), and one Re(2) atom. is represented by the CIF card [CIF]
data_Sr7Re4O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.395
_cell_length_b   7.395
_cell_length_c   10.426
_cell_angle_alpha   82.002
_cell_angle_beta   82.002
_cell_angle_gamma   44.392
_symmetry_Int_Tables_number   1
_cell_volume   394.296
_cell_formula_units_Z   1
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  0.210  0.210  0.411  1.0
  Sr  Sr1  1  0.790  0.790  0.589  1.0
  Sr  Sr2  1  0.416  0.416  0.165  1.0
  Sr  Sr3  1  0.584  0.584  0.835  1.0
  Sr  Sr4  1  0.500  0.500  0.500  1.0
  Sr  Sr5  1  0.860  0.860  0.957  1.0
  Sr  Sr6  1  0.140  0.140  0.043  1.0
  Re  Re7  1  0.966  0.966  0.324  1.0
  Re  Re8  1  0.034  0.034  0.676  1.0
  Re  Re9  1  0.670  0.670  0.219  1.0
  Re  Re10  1  0.330  0.330  0.781  1.0
  O  O11  1  0.000  0.000  0.500  1.0
  O  O12  1  0.696  0.696  0.386  1.0
  O  O13  1  0.304  0.304  0.614  1.0
  O  O14  1  0.045  0.045  0.855  1.0
  O  O15  1  0.955  0.955  0.145  1.0
  O  O16  1  0.398  0.398  0.930  1.0
  O  O17  1  0.602  0.602  0.070  1.0
  O  O18  1  0.825  0.316  0.284  1.0
  O  O19  1  0.684  0.175  0.716  1.0
  O  O20  1  0.175  0.684  0.716  1.0
  O  O21  1  0.316  0.825  0.284  1.0
  O  O22  1  0.628  0.121  0.374  1.0
  O  O23  1  0.879  0.372  0.626  1.0
  O  O24  1  0.372  0.879  0.626  1.0
  O  O25  1  0.121  0.628  0.374  1.0
  O  O26  1  0.998  0.516  0.153  1.0
  O  O27  1  0.484  0.002  0.847  1.0
  O  O28  1  0.002  0.484  0.847  1.0
  O  O29  1  0.516  0.998  0.153  1.0
[/CIF]
.
The structure described by Sr7Re4O19 crystallizes in the monoclinic C2/m space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), two equivalent O(5), two equivalent O(7), three equivalent O(2), and four equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra,  a cornercorner with one Re(2)O6 octahedra, corners with two equivalent Re(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, faces with two equivalent Re(1)O6 octahedra, and faces with two equivalent Re(2)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the third Sr site, Sr(3) is bonded to two equivalent O(1), two equivalent O(2), four equivalent O(5), and four equivalent O(6) atoms to form SrO12 cuboctahedra that share corners with two equivalent Sr(3)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Re(2)O6 octahedra, and faces with four equivalent Re(1)O6 octahedra. In the fourth Sr site, Sr(4) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and four equivalent O(7) atoms. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form ReO6 octahedra that share corners with two equivalent Sr(1)O12 cuboctahedra,  a cornercorner with one Re(1)O6 octahedra, corners with two equivalent Re(2)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Sr(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-9°. In the second Re site, Re(2) is bonded to one O(2), one O(4), two equivalent O(5), and two equivalent O(7) atoms to form ReO6 octahedra that share  a cornercorner with one Sr(1)O12 cuboctahedra, corners with two equivalent Re(1)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 9°. There are seven inequivalent O sites. In the first O site, O(6) is bonded to one Sr(2), one Sr(3), two equivalent Sr(1), and one Re(1) atom to form a mixture of distorted face, corner, and edge-sharing OSr4Re square pyramids. In the second O site, O(7) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(2), two equivalent Sr(4), and one Re(2) atom. In the third O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(3), and two equivalent Re(1) atoms. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one Sr(3), three equivalent Sr(1), and one Re(2) atom. In the fifth O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), and one Re(1) atom. In the sixth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), and one Re(2) atom. In the seventh O site, O(5) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Re(1), and one Re(2) atom. is represented by the CIF card [CIF]
data_Sr7Re4O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.395
_cell_length_b   7.395
_cell_length_c   10.426
_cell_angle_alpha   82.002
_cell_angle_beta   82.002
_cell_angle_gamma   44.392
_symmetry_Int_Tables_number   1
_cell_volume   394.296
_cell_formula_units_Z   1
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  0.210  0.210  0.411  1.0
  Sr  Sr1  1  0.790  0.790  0.589  1.0
  Sr  Sr2  1  0.416  0.416  0.165  1.0
  Sr  Sr3  1  0.584  0.584  0.835  1.0
  Sr  Sr4  1  0.500  0.500  0.500  1.0
  Sr  Sr5  1  0.860  0.860  0.957  1.0
  Sr  Sr6  1  0.140  0.140  0.043  1.0
  Re  Re7  1  0.966  0.966  0.324  1.0
  Re  Re8  1  0.034  0.034  0.676  1.0
  Re  Re9  1  0.670  0.670  0.219  1.0
  Re  Re10  1  0.330  0.330  0.781  1.0
  O  O11  1  0.000  0.000  0.500  1.0
  O  O12  1  0.696  0.696  0.386  1.0
  O  O13  1  0.304  0.304  0.614  1.0
  O  O14  1  0.045  0.045  0.855  1.0
  O  O15  1  0.955  0.955  0.145  1.0
  O  O16  1  0.398  0.398  0.930  1.0
  O  O17  1  0.602  0.602  0.070  1.0
  O  O18  1  0.825  0.316  0.284  1.0
  O  O19  1  0.684  0.175  0.716  1.0
  O  O20  1  0.175  0.684  0.716  1.0
  O  O21  1  0.316  0.825  0.284  1.0
  O  O22  1  0.628  0.121  0.374  1.0
  O  O23  1  0.879  0.372  0.626  1.0
  O  O24  1  0.372  0.879  0.626  1.0
  O  O25  1  0.121  0.628  0.374  1.0
  O  O26  1  0.998  0.516  0.153  1.0
  O  O27  1  0.484  0.002  0.847  1.0
  O  O28  1  0.002  0.484  0.847  1.0
  O  O29  1  0.516  0.998  0.153  1.0
[/CIF]
.