The compound described by Cs2C4Sb2O9F4 crystallizes in the triclinic P-1 space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 10-coordinate geometry to one O(1), one O(5), one O(6), one O(8), one O(9), one F(2), one F(3), one F(4), and two equivalent F(1) atoms. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(6), one O(7), two equivalent O(9), one F(1), and one F(3) atom. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 2-coordinate geometry to one F(1) and one F(2) atom. In the second Sb site, Sb(2) is bonded in a distorted pentagonal pyramidal geometry to one O(2), one O(4), one O(5), one O(7), one F(3), and one F(4) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), and one C(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one C(2) and one Sb(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Cs(2) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cs(2), one C(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Cs(1), one C(3), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one Cs(1), one Cs(2), and one C(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Cs(2), one C(4), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Cs(1) and one C(4) atom. In the ninth O site, O(9) is bonded in a T-shaped geometry to one Cs(1) and two equivalent Cs(2) atoms. There are four inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to one Cs(2), two equivalent Cs(1), and one Sb(1) atom. In the second F site, F(2) is bonded in a single-bond geometry to one Cs(1) and one Sb(1) atom. In the third F site, F(3) is bonded in a 3-coordinate geometry to one Cs(1), one Cs(2), and one Sb(2) atom. In the fourth F site, F(4) is bonded in a single-bond geometry to one Cs(1) and one Sb(2) atom. is represented by the CIF file [CIF]
data_Cs2Sb2C4O9F4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.784
_cell_length_b   8.705
_cell_length_c   11.584
_cell_angle_alpha   102.308
_cell_angle_beta   102.485
_cell_angle_gamma   64.880
_symmetry_Int_Tables_number   1
_cell_volume   775.659
_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
  Cs  Cs0  1  0.331  0.892  0.122  1.0
  Cs  Cs1  1  0.669  0.108  0.878  1.0
  Cs  Cs2  1  0.900  0.899  0.308  1.0
  Cs  Cs3  1  0.100  0.101  0.692  1.0
  Sb  Sb4  1  0.848  0.403  0.194  1.0
  Sb  Sb5  1  0.152  0.597  0.806  1.0
  Sb  Sb6  1  0.610  0.663  0.698  1.0
  Sb  Sb7  1  0.390  0.337  0.302  1.0
  C  C8  1  0.770  0.438  0.454  1.0
  C  C9  1  0.230  0.562  0.546  1.0
  C  C10  1  0.654  0.623  0.422  1.0
  C  C11  1  0.346  0.377  0.578  1.0
  C  C12  1  0.718  0.651  0.974  1.0
  C  C13  1  0.282  0.349  0.026  1.0
  C  C14  1  0.817  0.464  0.921  1.0
  C  C15  1  0.183  0.536  0.079  1.0
  O  O16  1  0.658  0.653  0.322  1.0
  O  O17  1  0.342  0.347  0.678  1.0
  O  O18  1  0.562  0.726  0.500  1.0
  O  O19  1  0.438  0.274  0.500  1.0
  O  O20  1  0.834  0.324  0.368  1.0
  O  O21  1  0.166  0.676  0.632  1.0
  O  O22  1  0.792  0.411  0.560  1.0
  O  O23  1  0.208  0.589  0.440  1.0
  O  O24  1  0.638  0.759  0.899  1.0
  O  O25  1  0.362  0.241  0.101  1.0
  O  O26  1  0.722  0.687  0.085  1.0
  O  O27  1  0.278  0.313  0.915  1.0
  O  O28  1  0.819  0.434  0.809  1.0
  O  O29  1  0.181  0.566  0.191  1.0
  O  O30  1  0.889  0.350  0.990  1.0
  O  O31  1  0.111  0.650  0.010  1.0
  O  O32  1  0.748  0.028  0.579  1.0
  O  O33  1  0.252  0.972  0.421  1.0
  F  F34  1  0.925  0.147  0.154  1.0
  F  F35  1  0.075  0.853  0.846  1.0
  F  F36  1  0.620  0.408  0.127  1.0
  F  F37  1  0.380  0.592  0.873  1.0
  F  F38  1  0.462  0.915  0.713  1.0
  F  F39  1  0.538  0.085  0.287  1.0
  F  F40  1  0.802  0.728  0.708  1.0
  F  F41  1  0.198  0.272  0.292  1.0
[/CIF]
.
The compound described by Cs2C4Sb2O9F4 crystallizes in the triclinic P-1 space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 10-coordinate geometry to one O(1), one O(5), one O(6), one O(8), one O(9), one F(2), one F(3), one F(4), and two equivalent F(1) atoms. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(6), one O(7), two equivalent O(9), one F(1), and one F(3) atom. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 2-coordinate geometry to one F(1) and one F(2) atom. In the second Sb site, Sb(2) is bonded in a distorted pentagonal pyramidal geometry to one O(2), one O(4), one O(5), one O(7), one F(3), and one F(4) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), and one C(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one C(2) and one Sb(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Cs(2) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cs(2), one C(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Cs(1), one C(3), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one Cs(1), one Cs(2), and one C(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Cs(2), one C(4), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Cs(1) and one C(4) atom. In the ninth O site, O(9) is bonded in a T-shaped geometry to one Cs(1) and two equivalent Cs(2) atoms. There are four inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to one Cs(2), two equivalent Cs(1), and one Sb(1) atom. In the second F site, F(2) is bonded in a single-bond geometry to one Cs(1) and one Sb(1) atom. In the third F site, F(3) is bonded in a 3-coordinate geometry to one Cs(1), one Cs(2), and one Sb(2) atom. In the fourth F site, F(4) is bonded in a single-bond geometry to one Cs(1) and one Sb(2) atom. is represented by the CIF file [CIF]
data_Cs2Sb2C4O9F4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.784
_cell_length_b   8.705
_cell_length_c   11.584
_cell_angle_alpha   102.308
_cell_angle_beta   102.485
_cell_angle_gamma   64.880
_symmetry_Int_Tables_number   1
_cell_volume   775.659
_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
  Cs  Cs0  1  0.331  0.892  0.122  1.0
  Cs  Cs1  1  0.669  0.108  0.878  1.0
  Cs  Cs2  1  0.900  0.899  0.308  1.0
  Cs  Cs3  1  0.100  0.101  0.692  1.0
  Sb  Sb4  1  0.848  0.403  0.194  1.0
  Sb  Sb5  1  0.152  0.597  0.806  1.0
  Sb  Sb6  1  0.610  0.663  0.698  1.0
  Sb  Sb7  1  0.390  0.337  0.302  1.0
  C  C8  1  0.770  0.438  0.454  1.0
  C  C9  1  0.230  0.562  0.546  1.0
  C  C10  1  0.654  0.623  0.422  1.0
  C  C11  1  0.346  0.377  0.578  1.0
  C  C12  1  0.718  0.651  0.974  1.0
  C  C13  1  0.282  0.349  0.026  1.0
  C  C14  1  0.817  0.464  0.921  1.0
  C  C15  1  0.183  0.536  0.079  1.0
  O  O16  1  0.658  0.653  0.322  1.0
  O  O17  1  0.342  0.347  0.678  1.0
  O  O18  1  0.562  0.726  0.500  1.0
  O  O19  1  0.438  0.274  0.500  1.0
  O  O20  1  0.834  0.324  0.368  1.0
  O  O21  1  0.166  0.676  0.632  1.0
  O  O22  1  0.792  0.411  0.560  1.0
  O  O23  1  0.208  0.589  0.440  1.0
  O  O24  1  0.638  0.759  0.899  1.0
  O  O25  1  0.362  0.241  0.101  1.0
  O  O26  1  0.722  0.687  0.085  1.0
  O  O27  1  0.278  0.313  0.915  1.0
  O  O28  1  0.819  0.434  0.809  1.0
  O  O29  1  0.181  0.566  0.191  1.0
  O  O30  1  0.889  0.350  0.990  1.0
  O  O31  1  0.111  0.650  0.010  1.0
  O  O32  1  0.748  0.028  0.579  1.0
  O  O33  1  0.252  0.972  0.421  1.0
  F  F34  1  0.925  0.147  0.154  1.0
  F  F35  1  0.075  0.853  0.846  1.0
  F  F36  1  0.620  0.408  0.127  1.0
  F  F37  1  0.380  0.592  0.873  1.0
  F  F38  1  0.462  0.915  0.713  1.0
  F  F39  1  0.538  0.085  0.287  1.0
  F  F40  1  0.802  0.728  0.708  1.0
  F  F41  1  0.198  0.272  0.292  1.0
[/CIF]
.