The compound described by Li2Cu2C2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(3), one O(6), one O(7), and two equivalent O(5) atoms. In the second Li site, Li(2) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form distorted face-sharing LiO6 octahedra. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(3), one O(4), and two equivalent O(1) atoms. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(2), one O(4), and two equivalent O(1) atoms. 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(5), and one O(7) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a 4-coordinate geometry to one Li(1), two equivalent Li(2), and one C(1) atom. In the second O site, O(1) is bonded in a see-saw-like geometry to two equivalent Cu(1) and two equivalent Cu(2) atoms. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(1) atom. In the fourth O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Cu(1), and one C(2) atom. In the fifth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cu(1), one Cu(2), and one C(2) atom. In the sixth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Li(1), two equivalent Li(2), and one C(1) atom. In the seventh O site, O(6) is bonded in a 4-coordinate geometry to one Li(1), two equivalent Li(2), and one C(2) atom. is represented by the CIF card [CIF]
data_Li2Cu2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.110
_cell_length_b   5.688
_cell_length_c   10.108
_cell_angle_alpha   90.000
_cell_angle_beta   111.800
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   539.639
_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  0.377  0.716  0.974  1.0
  Li  Li1  1  0.519  0.064  0.752  1.0
  Li  Li2  1  0.481  0.564  0.748  1.0
  Li  Li3  1  0.377  0.784  0.474  1.0
  Li  Li4  1  0.623  0.216  0.526  1.0
  Li  Li5  1  0.519  0.436  0.252  1.0
  Li  Li6  1  0.481  0.936  0.248  1.0
  Li  Li7  1  0.623  0.284  0.026  1.0
  Cu  Cu8  1  0.025  0.635  0.782  1.0
  Cu  Cu9  1  0.025  0.865  0.282  1.0
  Cu  Cu10  1  0.115  0.334  0.527  1.0
  Cu  Cu11  1  0.115  0.166  0.027  1.0
  Cu  Cu12  1  0.885  0.834  0.973  1.0
  Cu  Cu13  1  0.885  0.666  0.473  1.0
  Cu  Cu14  1  0.975  0.135  0.718  1.0
  Cu  Cu15  1  0.975  0.365  0.218  1.0
  C  C16  1  0.365  0.249  0.961  1.0
  C  C17  1  0.222  0.870  0.687  1.0
  C  C18  1  0.365  0.251  0.461  1.0
  C  C19  1  0.222  0.630  0.187  1.0
  C  C20  1  0.778  0.370  0.813  1.0
  C  C21  1  0.635  0.749  0.539  1.0
  C  C22  1  0.778  0.130  0.313  1.0
  C  C23  1  0.635  0.751  0.039  1.0
  O  O24  1  0.017  0.921  0.886  1.0
  O  O25  1  0.226  0.258  0.921  1.0
  O  O26  1  0.213  0.727  0.784  1.0
  O  O27  1  0.017  0.579  0.386  1.0
  O  O28  1  0.123  0.034  0.638  1.0
  O  O29  1  0.422  0.326  0.875  1.0
  O  O30  1  0.226  0.242  0.421  1.0
  O  O31  1  0.323  0.850  0.642  1.0
  O  O32  1  0.213  0.773  0.284  1.0
  O  O33  1  0.123  0.466  0.138  1.0
  O  O34  1  0.445  0.331  0.585  1.0
  O  O35  1  0.555  0.831  0.915  1.0
  O  O36  1  0.422  0.174  0.375  1.0
  O  O37  1  0.323  0.650  0.142  1.0
  O  O38  1  0.677  0.350  0.858  1.0
  O  O39  1  0.578  0.826  0.625  1.0
  O  O40  1  0.445  0.169  0.085  1.0
  O  O41  1  0.555  0.669  0.415  1.0
  O  O42  1  0.877  0.534  0.862  1.0
  O  O43  1  0.787  0.227  0.716  1.0
  O  O44  1  0.677  0.150  0.358  1.0
  O  O45  1  0.774  0.758  0.579  1.0
  O  O46  1  0.578  0.674  0.125  1.0
  O  O47  1  0.877  0.966  0.362  1.0
  O  O48  1  0.983  0.421  0.614  1.0
  O  O49  1  0.787  0.273  0.216  1.0
  O  O50  1  0.774  0.742  0.079  1.0
  O  O51  1  0.983  0.079  0.114  1.0
[/CIF]
.
The compound described by Li2Cu2C2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(3), one O(6), one O(7), and two equivalent O(5) atoms. In the second Li site, Li(2) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form distorted face-sharing LiO6 octahedra. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(3), one O(4), and two equivalent O(1) atoms. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(2), one O(4), and two equivalent O(1) atoms. 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(5), and one O(7) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a 4-coordinate geometry to one Li(1), two equivalent Li(2), and one C(1) atom. In the second O site, O(1) is bonded in a see-saw-like geometry to two equivalent Cu(1) and two equivalent Cu(2) atoms. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(1) atom. In the fourth O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Cu(1), and one C(2) atom. In the fifth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cu(1), one Cu(2), and one C(2) atom. In the sixth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Li(1), two equivalent Li(2), and one C(1) atom. In the seventh O site, O(6) is bonded in a 4-coordinate geometry to one Li(1), two equivalent Li(2), and one C(2) atom. is represented by the CIF card [CIF]
data_Li2Cu2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.110
_cell_length_b   5.688
_cell_length_c   10.108
_cell_angle_alpha   90.000
_cell_angle_beta   111.800
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   539.639
_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  0.377  0.716  0.974  1.0
  Li  Li1  1  0.519  0.064  0.752  1.0
  Li  Li2  1  0.481  0.564  0.748  1.0
  Li  Li3  1  0.377  0.784  0.474  1.0
  Li  Li4  1  0.623  0.216  0.526  1.0
  Li  Li5  1  0.519  0.436  0.252  1.0
  Li  Li6  1  0.481  0.936  0.248  1.0
  Li  Li7  1  0.623  0.284  0.026  1.0
  Cu  Cu8  1  0.025  0.635  0.782  1.0
  Cu  Cu9  1  0.025  0.865  0.282  1.0
  Cu  Cu10  1  0.115  0.334  0.527  1.0
  Cu  Cu11  1  0.115  0.166  0.027  1.0
  Cu  Cu12  1  0.885  0.834  0.973  1.0
  Cu  Cu13  1  0.885  0.666  0.473  1.0
  Cu  Cu14  1  0.975  0.135  0.718  1.0
  Cu  Cu15  1  0.975  0.365  0.218  1.0
  C  C16  1  0.365  0.249  0.961  1.0
  C  C17  1  0.222  0.870  0.687  1.0
  C  C18  1  0.365  0.251  0.461  1.0
  C  C19  1  0.222  0.630  0.187  1.0
  C  C20  1  0.778  0.370  0.813  1.0
  C  C21  1  0.635  0.749  0.539  1.0
  C  C22  1  0.778  0.130  0.313  1.0
  C  C23  1  0.635  0.751  0.039  1.0
  O  O24  1  0.017  0.921  0.886  1.0
  O  O25  1  0.226  0.258  0.921  1.0
  O  O26  1  0.213  0.727  0.784  1.0
  O  O27  1  0.017  0.579  0.386  1.0
  O  O28  1  0.123  0.034  0.638  1.0
  O  O29  1  0.422  0.326  0.875  1.0
  O  O30  1  0.226  0.242  0.421  1.0
  O  O31  1  0.323  0.850  0.642  1.0
  O  O32  1  0.213  0.773  0.284  1.0
  O  O33  1  0.123  0.466  0.138  1.0
  O  O34  1  0.445  0.331  0.585  1.0
  O  O35  1  0.555  0.831  0.915  1.0
  O  O36  1  0.422  0.174  0.375  1.0
  O  O37  1  0.323  0.650  0.142  1.0
  O  O38  1  0.677  0.350  0.858  1.0
  O  O39  1  0.578  0.826  0.625  1.0
  O  O40  1  0.445  0.169  0.085  1.0
  O  O41  1  0.555  0.669  0.415  1.0
  O  O42  1  0.877  0.534  0.862  1.0
  O  O43  1  0.787  0.227  0.716  1.0
  O  O44  1  0.677  0.150  0.358  1.0
  O  O45  1  0.774  0.758  0.579  1.0
  O  O46  1  0.578  0.674  0.125  1.0
  O  O47  1  0.877  0.966  0.362  1.0
  O  O48  1  0.983  0.421  0.614  1.0
  O  O49  1  0.787  0.273  0.216  1.0
  O  O50  1  0.774  0.742  0.079  1.0
  O  O51  1  0.983  0.079  0.114  1.0
[/CIF]
.