The structure described by Co2C2O7 crystallizes in the monoclinic C2 space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(11), one O(2), and one O(8) atom to form corner-sharing CoO4 tetrahedra. In the second Co site, Co(2) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form corner-sharing CoO4 tetrahedra. In the third Co site, Co(3) is bonded to one O(10), one O(3), one O(5), and one O(6) atom to form corner-sharing CoO4 tetrahedra. There are three inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(3), one O(8), and one O(9) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(6) atom. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(7) atom. There are eleven inequivalent O sites. In the first O site, O(9) is bonded in a bent 120 degrees geometry to one Co(2) and one C(1) atom. In the second O site, O(10) is bonded in a bent 120 degrees geometry to one Co(3) and one C(3) atom. In the third O site, O(11) is bonded in a bent 120 degrees geometry to one Co(1) and one C(3) atom. In the fourth O site, O(1) is bonded in a linear geometry to two equivalent Co(1) atoms. In the fifth O site, O(2) is bonded in a bent 120 degrees geometry to one Co(1) and one C(2) atom. In the sixth O site, O(3) is bonded in a bent 120 degrees geometry to one Co(3) and one C(1) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one Co(2) and one C(2) atom. In the eighth O site, O(5) is bonded in a linear geometry to one Co(2) and one Co(3) atom. In the ninth O site, O(6) is bonded in a bent 120 degrees geometry to one Co(3) and one C(2) atom. In the tenth O site, O(7) is bonded in a bent 120 degrees geometry to one Co(2) and one C(3) atom. In the eleventh O site, O(8) is bonded in a bent 120 degrees geometry to one Co(1) and one C(1) atom. is represented by the CIF card [CIF]
data_Co2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.396
_cell_length_b   8.396
_cell_length_c   8.229
_cell_angle_alpha   87.681
_cell_angle_beta   87.681
_cell_angle_gamma   59.499
_symmetry_Int_Tables_number   1
_cell_volume   499.327
_cell_formula_units_Z   3
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  0.001  0.998  0.716  1.0
  Co  Co1  1  0.002  0.999  0.284  1.0
  Co  Co2  1  0.340  0.335  0.171  1.0
  Co  Co3  1  0.330  0.336  0.737  1.0
  Co  Co4  1  0.665  0.660  0.829  1.0
  Co  Co5  1  0.664  0.670  0.263  1.0
  C  C6  1  0.660  0.998  0.732  1.0
  C  C7  1  0.999  0.335  0.730  1.0
  C  C8  1  0.340  0.667  0.732  1.0
  C  C9  1  0.002  0.340  0.268  1.0
  C  C10  1  0.665  0.001  0.270  1.0
  C  C11  1  0.333  0.660  0.268  1.0
  O  O12  1  0.004  0.996  0.500  1.0
  O  O13  1  0.764  0.068  0.210  1.0
  O  O14  1  0.573  0.164  0.665  1.0
  O  O15  1  0.488  0.097  0.267  1.0
  O  O16  1  0.333  0.330  0.957  1.0
  O  O17  1  0.166  0.257  0.668  1.0
  O  O18  1  0.421  0.482  0.269  1.0
  O  O19  1  0.069  0.175  0.215  1.0
  O  O20  1  0.932  0.236  0.790  1.0
  O  O21  1  0.094  0.424  0.255  1.0
  O  O22  1  0.257  0.585  0.677  1.0
  O  O23  1  0.168  0.754  0.214  1.0
  O  O24  1  0.836  0.427  0.335  1.0
  O  O25  1  0.903  0.512  0.733  1.0
  O  O26  1  0.670  0.667  0.043  1.0
  O  O27  1  0.743  0.834  0.332  1.0
  O  O28  1  0.518  0.579  0.731  1.0
  O  O29  1  0.825  0.931  0.785  1.0
  O  O30  1  0.576  0.906  0.745  1.0
  O  O31  1  0.415  0.743  0.323  1.0
  O  O32  1  0.246  0.832  0.786  1.0
[/CIF]
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The structure described by Co2C2O7 crystallizes in the monoclinic C2 space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(11), one O(2), and one O(8) atom to form corner-sharing CoO4 tetrahedra. In the second Co site, Co(2) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form corner-sharing CoO4 tetrahedra. In the third Co site, Co(3) is bonded to one O(10), one O(3), one O(5), and one O(6) atom to form corner-sharing CoO4 tetrahedra. There are three inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(3), one O(8), and one O(9) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(6) atom. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(7) atom. There are eleven inequivalent O sites. In the first O site, O(9) is bonded in a bent 120 degrees geometry to one Co(2) and one C(1) atom. In the second O site, O(10) is bonded in a bent 120 degrees geometry to one Co(3) and one C(3) atom. In the third O site, O(11) is bonded in a bent 120 degrees geometry to one Co(1) and one C(3) atom. In the fourth O site, O(1) is bonded in a linear geometry to two equivalent Co(1) atoms. In the fifth O site, O(2) is bonded in a bent 120 degrees geometry to one Co(1) and one C(2) atom. In the sixth O site, O(3) is bonded in a bent 120 degrees geometry to one Co(3) and one C(1) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one Co(2) and one C(2) atom. In the eighth O site, O(5) is bonded in a linear geometry to one Co(2) and one Co(3) atom. In the ninth O site, O(6) is bonded in a bent 120 degrees geometry to one Co(3) and one C(2) atom. In the tenth O site, O(7) is bonded in a bent 120 degrees geometry to one Co(2) and one C(3) atom. In the eleventh O site, O(8) is bonded in a bent 120 degrees geometry to one Co(1) and one C(1) atom. is represented by the CIF card [CIF]
data_Co2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.396
_cell_length_b   8.396
_cell_length_c   8.229
_cell_angle_alpha   87.681
_cell_angle_beta   87.681
_cell_angle_gamma   59.499
_symmetry_Int_Tables_number   1
_cell_volume   499.327
_cell_formula_units_Z   3
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  0.001  0.998  0.716  1.0
  Co  Co1  1  0.002  0.999  0.284  1.0
  Co  Co2  1  0.340  0.335  0.171  1.0
  Co  Co3  1  0.330  0.336  0.737  1.0
  Co  Co4  1  0.665  0.660  0.829  1.0
  Co  Co5  1  0.664  0.670  0.263  1.0
  C  C6  1  0.660  0.998  0.732  1.0
  C  C7  1  0.999  0.335  0.730  1.0
  C  C8  1  0.340  0.667  0.732  1.0
  C  C9  1  0.002  0.340  0.268  1.0
  C  C10  1  0.665  0.001  0.270  1.0
  C  C11  1  0.333  0.660  0.268  1.0
  O  O12  1  0.004  0.996  0.500  1.0
  O  O13  1  0.764  0.068  0.210  1.0
  O  O14  1  0.573  0.164  0.665  1.0
  O  O15  1  0.488  0.097  0.267  1.0
  O  O16  1  0.333  0.330  0.957  1.0
  O  O17  1  0.166  0.257  0.668  1.0
  O  O18  1  0.421  0.482  0.269  1.0
  O  O19  1  0.069  0.175  0.215  1.0
  O  O20  1  0.932  0.236  0.790  1.0
  O  O21  1  0.094  0.424  0.255  1.0
  O  O22  1  0.257  0.585  0.677  1.0
  O  O23  1  0.168  0.754  0.214  1.0
  O  O24  1  0.836  0.427  0.335  1.0
  O  O25  1  0.903  0.512  0.733  1.0
  O  O26  1  0.670  0.667  0.043  1.0
  O  O27  1  0.743  0.834  0.332  1.0
  O  O28  1  0.518  0.579  0.731  1.0
  O  O29  1  0.825  0.931  0.785  1.0
  O  O30  1  0.576  0.906  0.745  1.0
  O  O31  1  0.415  0.743  0.323  1.0
  O  O32  1  0.246  0.832  0.786  1.0
[/CIF]
.