The material structure described by Fe2C2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(7) atom. In the second Fe site, Fe(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(5), and one O(6) atom. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(6) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(3), one O(5), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Fe(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Fe(1) and one Fe(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Fe(2) and one C(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(2) atom. is represented by the CIF card [CIF]
data_Fe2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.740
_cell_length_b   8.055
_cell_length_c   11.561
_cell_angle_alpha   75.534
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   697.950
_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
  Fe  Fe0  1  0.583  0.795  0.628  1.0
  Fe  Fe1  1  0.638  0.362  0.118  1.0
  Fe  Fe2  1  0.862  0.362  0.618  1.0
  Fe  Fe3  1  0.083  0.205  0.872  1.0
  Fe  Fe4  1  0.917  0.795  0.128  1.0
  Fe  Fe5  1  0.138  0.638  0.382  1.0
  Fe  Fe6  1  0.362  0.638  0.882  1.0
  Fe  Fe7  1  0.417  0.205  0.372  1.0
  C  C8  1  0.894  0.740  0.544  1.0
  C  C9  1  0.394  0.260  0.956  1.0
  C  C10  1  0.926  0.167  0.101  1.0
  C  C11  1  0.426  0.833  0.399  1.0
  C  C12  1  0.574  0.167  0.601  1.0
  C  C13  1  0.074  0.833  0.899  1.0
  C  C14  1  0.606  0.740  0.044  1.0
  C  C15  1  0.106  0.260  0.456  1.0
  O  O16  1  0.825  0.864  0.580  1.0
  O  O17  1  0.533  0.645  0.771  1.0
  O  O18  1  0.441  0.733  0.505  1.0
  O  O19  1  0.799  0.601  0.556  1.0
  O  O20  1  0.299  0.399  0.944  1.0
  O  O21  1  0.833  0.217  0.180  1.0
  O  O22  1  0.941  0.267  0.995  1.0
  O  O23  1  0.033  0.355  0.729  1.0
  O  O24  1  0.546  0.249  0.001  1.0
  O  O25  1  0.504  0.980  0.370  1.0
  O  O26  1  0.004  0.020  0.130  1.0
  O  O27  1  0.325  0.136  0.920  1.0
  O  O28  1  0.667  0.217  0.680  1.0
  O  O29  1  0.046  0.751  0.499  1.0
  O  O30  1  0.954  0.249  0.501  1.0
  O  O31  1  0.333  0.783  0.320  1.0
  O  O32  1  0.675  0.864  0.080  1.0
  O  O33  1  0.996  0.980  0.870  1.0
  O  O34  1  0.496  0.020  0.630  1.0
  O  O35  1  0.454  0.751  0.999  1.0
  O  O36  1  0.967  0.645  0.271  1.0
  O  O37  1  0.059  0.733  0.005  1.0
  O  O38  1  0.167  0.783  0.820  1.0
  O  O39  1  0.701  0.601  0.056  1.0
  O  O40  1  0.201  0.399  0.444  1.0
  O  O41  1  0.559  0.267  0.495  1.0
  O  O42  1  0.467  0.355  0.229  1.0
  O  O43  1  0.175  0.136  0.420  1.0
[/CIF]
.
The material structure described by Fe2C2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(7) atom. In the second Fe site, Fe(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(5), and one O(6) atom. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(6) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(3), one O(5), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Fe(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Fe(1) and one Fe(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Fe(2) and one C(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(2) atom. is represented by the CIF card [CIF]
data_Fe2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.740
_cell_length_b   8.055
_cell_length_c   11.561
_cell_angle_alpha   75.534
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   697.950
_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
  Fe  Fe0  1  0.583  0.795  0.628  1.0
  Fe  Fe1  1  0.638  0.362  0.118  1.0
  Fe  Fe2  1  0.862  0.362  0.618  1.0
  Fe  Fe3  1  0.083  0.205  0.872  1.0
  Fe  Fe4  1  0.917  0.795  0.128  1.0
  Fe  Fe5  1  0.138  0.638  0.382  1.0
  Fe  Fe6  1  0.362  0.638  0.882  1.0
  Fe  Fe7  1  0.417  0.205  0.372  1.0
  C  C8  1  0.894  0.740  0.544  1.0
  C  C9  1  0.394  0.260  0.956  1.0
  C  C10  1  0.926  0.167  0.101  1.0
  C  C11  1  0.426  0.833  0.399  1.0
  C  C12  1  0.574  0.167  0.601  1.0
  C  C13  1  0.074  0.833  0.899  1.0
  C  C14  1  0.606  0.740  0.044  1.0
  C  C15  1  0.106  0.260  0.456  1.0
  O  O16  1  0.825  0.864  0.580  1.0
  O  O17  1  0.533  0.645  0.771  1.0
  O  O18  1  0.441  0.733  0.505  1.0
  O  O19  1  0.799  0.601  0.556  1.0
  O  O20  1  0.299  0.399  0.944  1.0
  O  O21  1  0.833  0.217  0.180  1.0
  O  O22  1  0.941  0.267  0.995  1.0
  O  O23  1  0.033  0.355  0.729  1.0
  O  O24  1  0.546  0.249  0.001  1.0
  O  O25  1  0.504  0.980  0.370  1.0
  O  O26  1  0.004  0.020  0.130  1.0
  O  O27  1  0.325  0.136  0.920  1.0
  O  O28  1  0.667  0.217  0.680  1.0
  O  O29  1  0.046  0.751  0.499  1.0
  O  O30  1  0.954  0.249  0.501  1.0
  O  O31  1  0.333  0.783  0.320  1.0
  O  O32  1  0.675  0.864  0.080  1.0
  O  O33  1  0.996  0.980  0.870  1.0
  O  O34  1  0.496  0.020  0.630  1.0
  O  O35  1  0.454  0.751  0.999  1.0
  O  O36  1  0.967  0.645  0.271  1.0
  O  O37  1  0.059  0.733  0.005  1.0
  O  O38  1  0.167  0.783  0.820  1.0
  O  O39  1  0.701  0.601  0.056  1.0
  O  O40  1  0.201  0.399  0.444  1.0
  O  O41  1  0.559  0.267  0.495  1.0
  O  O42  1  0.467  0.355  0.229  1.0
  O  O43  1  0.175  0.136  0.420  1.0
[/CIF]
.