The structure described by Li2Fe2C2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(6), and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with three equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. In the second Li site, Li(2) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 trigonal bipyramid. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(5), one O(6), and two equivalent O(1) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Li(2)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(7) atom. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(5) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(4), one O(6), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a see-saw-like geometry to one Li(1), one Fe(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Li(1), one Fe(1), and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(2), one Fe(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(2), one Fe(2), and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal pyramidal geometry to one Li(2), one Fe(1), one Fe(2), and one C(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Li(1), one Fe(1), and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Li(2), one Fe(2), and one C(2) atom. is represented by the CIF card [CIF]
data_Li2Fe2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.609
_cell_length_b   9.111
_cell_length_c   10.704
_cell_angle_alpha   78.304
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   631.145
_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
  Li  Li0  1  0.206  0.952  0.515  1.0
  Li  Li1  1  0.294  0.952  0.015  1.0
  Li  Li2  1  0.188  0.375  0.579  1.0
  Li  Li3  1  0.688  0.625  0.921  1.0
  Li  Li4  1  0.312  0.375  0.079  1.0
  Li  Li5  1  0.812  0.625  0.421  1.0
  Li  Li6  1  0.706  0.048  0.985  1.0
  Li  Li7  1  0.794  0.048  0.485  1.0
  Fe  Fe8  1  0.103  0.979  0.760  1.0
  Fe  Fe9  1  0.421  0.716  0.675  1.0
  Fe  Fe10  1  0.397  0.979  0.260  1.0
  Fe  Fe11  1  0.079  0.716  0.175  1.0
  Fe  Fe12  1  0.921  0.284  0.825  1.0
  Fe  Fe13  1  0.603  0.021  0.740  1.0
  Fe  Fe14  1  0.579  0.284  0.325  1.0
  Fe  Fe15  1  0.897  0.021  0.240  1.0
  C  C16  1  0.805  0.782  0.643  1.0
  C  C17  1  0.754  0.327  0.552  1.0
  C  C18  1  0.254  0.673  0.948  1.0
  C  C19  1  0.695  0.782  0.143  1.0
  C  C20  1  0.305  0.218  0.857  1.0
  C  C21  1  0.746  0.327  0.052  1.0
  C  C22  1  0.246  0.673  0.448  1.0
  C  C23  1  0.195  0.218  0.357  1.0
  O  O24  1  0.359  0.937  0.671  1.0
  O  O25  1  0.957  0.870  0.604  1.0
  O  O26  1  0.715  0.706  0.571  1.0
  O  O27  1  0.275  0.589  0.562  1.0
  O  O28  1  0.730  0.780  0.757  1.0
  O  O29  1  0.174  0.805  0.925  1.0
  O  O30  1  0.366  0.621  0.867  1.0
  O  O31  1  0.866  0.379  0.633  1.0
  O  O32  1  0.141  0.937  0.171  1.0
  O  O33  1  0.543  0.870  0.104  1.0
  O  O34  1  0.674  0.195  0.575  1.0
  O  O35  1  0.785  0.706  0.071  1.0
  O  O36  1  0.225  0.589  0.062  1.0
  O  O37  1  0.770  0.780  0.257  1.0
  O  O38  1  0.230  0.220  0.743  1.0
  O  O39  1  0.775  0.411  0.938  1.0
  O  O40  1  0.215  0.294  0.929  1.0
  O  O41  1  0.326  0.805  0.425  1.0
  O  O42  1  0.457  0.130  0.896  1.0
  O  O43  1  0.859  0.063  0.829  1.0
  O  O44  1  0.134  0.621  0.367  1.0
  O  O45  1  0.634  0.379  0.133  1.0
  O  O46  1  0.826  0.195  0.075  1.0
  O  O47  1  0.270  0.220  0.243  1.0
  O  O48  1  0.725  0.411  0.438  1.0
  O  O49  1  0.285  0.294  0.429  1.0
  O  O50  1  0.043  0.130  0.396  1.0
  O  O51  1  0.641  0.063  0.329  1.0
[/CIF]
.
The structure described by Li2Fe2C2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(6), and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with three equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. In the second Li site, Li(2) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 trigonal bipyramid. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(5), one O(6), and two equivalent O(1) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Li(2)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(7) atom. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(5) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(4), one O(6), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a see-saw-like geometry to one Li(1), one Fe(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Li(1), one Fe(1), and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(2), one Fe(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(2), one Fe(2), and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal pyramidal geometry to one Li(2), one Fe(1), one Fe(2), and one C(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Li(1), one Fe(1), and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Li(2), one Fe(2), and one C(2) atom. is represented by the CIF card [CIF]
data_Li2Fe2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.609
_cell_length_b   9.111
_cell_length_c   10.704
_cell_angle_alpha   78.304
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   631.145
_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
  Li  Li0  1  0.206  0.952  0.515  1.0
  Li  Li1  1  0.294  0.952  0.015  1.0
  Li  Li2  1  0.188  0.375  0.579  1.0
  Li  Li3  1  0.688  0.625  0.921  1.0
  Li  Li4  1  0.312  0.375  0.079  1.0
  Li  Li5  1  0.812  0.625  0.421  1.0
  Li  Li6  1  0.706  0.048  0.985  1.0
  Li  Li7  1  0.794  0.048  0.485  1.0
  Fe  Fe8  1  0.103  0.979  0.760  1.0
  Fe  Fe9  1  0.421  0.716  0.675  1.0
  Fe  Fe10  1  0.397  0.979  0.260  1.0
  Fe  Fe11  1  0.079  0.716  0.175  1.0
  Fe  Fe12  1  0.921  0.284  0.825  1.0
  Fe  Fe13  1  0.603  0.021  0.740  1.0
  Fe  Fe14  1  0.579  0.284  0.325  1.0
  Fe  Fe15  1  0.897  0.021  0.240  1.0
  C  C16  1  0.805  0.782  0.643  1.0
  C  C17  1  0.754  0.327  0.552  1.0
  C  C18  1  0.254  0.673  0.948  1.0
  C  C19  1  0.695  0.782  0.143  1.0
  C  C20  1  0.305  0.218  0.857  1.0
  C  C21  1  0.746  0.327  0.052  1.0
  C  C22  1  0.246  0.673  0.448  1.0
  C  C23  1  0.195  0.218  0.357  1.0
  O  O24  1  0.359  0.937  0.671  1.0
  O  O25  1  0.957  0.870  0.604  1.0
  O  O26  1  0.715  0.706  0.571  1.0
  O  O27  1  0.275  0.589  0.562  1.0
  O  O28  1  0.730  0.780  0.757  1.0
  O  O29  1  0.174  0.805  0.925  1.0
  O  O30  1  0.366  0.621  0.867  1.0
  O  O31  1  0.866  0.379  0.633  1.0
  O  O32  1  0.141  0.937  0.171  1.0
  O  O33  1  0.543  0.870  0.104  1.0
  O  O34  1  0.674  0.195  0.575  1.0
  O  O35  1  0.785  0.706  0.071  1.0
  O  O36  1  0.225  0.589  0.062  1.0
  O  O37  1  0.770  0.780  0.257  1.0
  O  O38  1  0.230  0.220  0.743  1.0
  O  O39  1  0.775  0.411  0.938  1.0
  O  O40  1  0.215  0.294  0.929  1.0
  O  O41  1  0.326  0.805  0.425  1.0
  O  O42  1  0.457  0.130  0.896  1.0
  O  O43  1  0.859  0.063  0.829  1.0
  O  O44  1  0.134  0.621  0.367  1.0
  O  O45  1  0.634  0.379  0.133  1.0
  O  O46  1  0.826  0.195  0.075  1.0
  O  O47  1  0.270  0.220  0.243  1.0
  O  O48  1  0.725  0.411  0.438  1.0
  O  O49  1  0.285  0.294  0.429  1.0
  O  O50  1  0.043  0.130  0.396  1.0
  O  O51  1  0.641  0.063  0.329  1.0
[/CIF]
.