The material described by Co2C2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form corner-sharing CoO4 tetrahedra. In the second Co site, Co(2) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form corner-sharing CoO4 tetrahedra. 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(2), 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 bent 120 degrees geometry to one Co(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(2) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Co(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Co(1) and one Co(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Co(2) and one C(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Co(1) and one C(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Co2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.880
_cell_length_b   8.047
_cell_length_c   11.407
_cell_angle_alpha   78.672
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   709.246
_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
  Co  Co0  1  0.432  0.796  0.626  1.0
  Co  Co1  1  0.627  0.642  0.883  1.0
  Co  Co2  1  0.068  0.796  0.126  1.0
  Co  Co3  1  0.873  0.642  0.383  1.0
  Co  Co4  1  0.127  0.358  0.617  1.0
  Co  Co5  1  0.932  0.204  0.874  1.0
  Co  Co6  1  0.373  0.358  0.117  1.0
  Co  Co7  1  0.568  0.204  0.374  1.0
  C  C8  1  0.914  0.839  0.896  1.0
  C  C9  1  0.586  0.839  0.396  1.0
  C  C10  1  0.121  0.726  0.546  1.0
  C  C11  1  0.379  0.726  0.046  1.0
  C  C12  1  0.621  0.274  0.954  1.0
  C  C13  1  0.879  0.274  0.454  1.0
  C  C14  1  0.414  0.161  0.604  1.0
  C  C15  1  0.086  0.161  0.104  1.0
  O  O16  1  0.999  0.978  0.867  1.0
  O  O17  1  0.810  0.791  0.821  1.0
  O  O18  1  0.501  0.978  0.367  1.0
  O  O19  1  0.201  0.853  0.573  1.0
  O  O20  1  0.468  0.662  0.768  1.0
  O  O21  1  0.968  0.743  0.507  1.0
  O  O22  1  0.564  0.740  0.500  1.0
  O  O23  1  0.690  0.791  0.321  1.0
  O  O24  1  0.299  0.853  0.073  1.0
  O  O25  1  0.204  0.581  0.559  1.0
  O  O26  1  0.704  0.419  0.941  1.0
  O  O27  1  0.064  0.260  0.000  1.0
  O  O28  1  0.032  0.662  0.268  1.0
  O  O29  1  0.532  0.743  0.007  1.0
  O  O30  1  0.468  0.257  0.993  1.0
  O  O31  1  0.968  0.338  0.732  1.0
  O  O32  1  0.936  0.740  1.000  1.0
  O  O33  1  0.296  0.581  0.059  1.0
  O  O34  1  0.796  0.419  0.441  1.0
  O  O35  1  0.701  0.147  0.927  1.0
  O  O36  1  0.310  0.209  0.679  1.0
  O  O37  1  0.436  0.260  0.500  1.0
  O  O38  1  0.032  0.257  0.493  1.0
  O  O39  1  0.532  0.338  0.232  1.0
  O  O40  1  0.799  0.147  0.427  1.0
  O  O41  1  0.499  0.022  0.633  1.0
  O  O42  1  0.190  0.209  0.179  1.0
  O  O43  1  0.001  0.022  0.133  1.0
[/CIF]
.
The material described by Co2C2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form corner-sharing CoO4 tetrahedra. In the second Co site, Co(2) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form corner-sharing CoO4 tetrahedra. 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(2), 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 bent 120 degrees geometry to one Co(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(2) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Co(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Co(1) and one Co(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Co(2) and one C(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Co(1) and one C(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Co2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.880
_cell_length_b   8.047
_cell_length_c   11.407
_cell_angle_alpha   78.672
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   709.246
_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
  Co  Co0  1  0.432  0.796  0.626  1.0
  Co  Co1  1  0.627  0.642  0.883  1.0
  Co  Co2  1  0.068  0.796  0.126  1.0
  Co  Co3  1  0.873  0.642  0.383  1.0
  Co  Co4  1  0.127  0.358  0.617  1.0
  Co  Co5  1  0.932  0.204  0.874  1.0
  Co  Co6  1  0.373  0.358  0.117  1.0
  Co  Co7  1  0.568  0.204  0.374  1.0
  C  C8  1  0.914  0.839  0.896  1.0
  C  C9  1  0.586  0.839  0.396  1.0
  C  C10  1  0.121  0.726  0.546  1.0
  C  C11  1  0.379  0.726  0.046  1.0
  C  C12  1  0.621  0.274  0.954  1.0
  C  C13  1  0.879  0.274  0.454  1.0
  C  C14  1  0.414  0.161  0.604  1.0
  C  C15  1  0.086  0.161  0.104  1.0
  O  O16  1  0.999  0.978  0.867  1.0
  O  O17  1  0.810  0.791  0.821  1.0
  O  O18  1  0.501  0.978  0.367  1.0
  O  O19  1  0.201  0.853  0.573  1.0
  O  O20  1  0.468  0.662  0.768  1.0
  O  O21  1  0.968  0.743  0.507  1.0
  O  O22  1  0.564  0.740  0.500  1.0
  O  O23  1  0.690  0.791  0.321  1.0
  O  O24  1  0.299  0.853  0.073  1.0
  O  O25  1  0.204  0.581  0.559  1.0
  O  O26  1  0.704  0.419  0.941  1.0
  O  O27  1  0.064  0.260  0.000  1.0
  O  O28  1  0.032  0.662  0.268  1.0
  O  O29  1  0.532  0.743  0.007  1.0
  O  O30  1  0.468  0.257  0.993  1.0
  O  O31  1  0.968  0.338  0.732  1.0
  O  O32  1  0.936  0.740  1.000  1.0
  O  O33  1  0.296  0.581  0.059  1.0
  O  O34  1  0.796  0.419  0.441  1.0
  O  O35  1  0.701  0.147  0.927  1.0
  O  O36  1  0.310  0.209  0.679  1.0
  O  O37  1  0.436  0.260  0.500  1.0
  O  O38  1  0.032  0.257  0.493  1.0
  O  O39  1  0.532  0.338  0.232  1.0
  O  O40  1  0.799  0.147  0.427  1.0
  O  O41  1  0.499  0.022  0.633  1.0
  O  O42  1  0.190  0.209  0.179  1.0
  O  O43  1  0.001  0.022  0.133  1.0
[/CIF]
.