The structure described by Li2Mn2C2O7 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 trigonal non-coplanar geometry to one O(3), one O(5), and one O(7) atom. 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 distorted LiO4 tetrahedra that share  a cornercorner with one Mn(2)O5 square pyramid and  an edgeedge with one Mn(1)O5 trigonal bipyramid. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), one O(6), one O(7), and two equivalent O(2) atoms to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mn(2)O5 square pyramids, edges with two equivalent Mn(2)O5 square pyramids,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. In the second Mn site, Mn(2) is bonded to one O(1), one O(4), one O(6), and two equivalent O(2) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mn(2)O5 square pyramids,  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, and edges with two equivalent Mn(1)O5 trigonal bipyramids. 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(3), and one O(4) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(5), 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 distorted bent 120 degrees geometry to one Mn(2) and one C(1) atom. In the second O site, O(2) is bonded to two equivalent Mn(1) and two equivalent Mn(2) atoms to form a mixture of edge and corner-sharing OMn4 tetrahedra. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Li(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Li(2), one Mn(1), one Mn(2), and one C(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(1), one Li(2), and one C(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one C(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Mn(1), and one C(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2Mn2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.853
_cell_length_b   9.627
_cell_length_c   10.336
_cell_angle_alpha   64.583
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   615.941
_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  0.253  0.261  0.004  1.0
  Li  Li1  1  0.646  0.424  0.149  1.0
  Li  Li2  1  0.146  0.076  0.851  1.0
  Li  Li3  1  0.753  0.239  0.996  1.0
  Li  Li4  1  0.247  0.761  0.004  1.0
  Li  Li5  1  0.854  0.924  0.149  1.0
  Li  Li6  1  0.354  0.576  0.851  1.0
  Li  Li7  1  0.747  0.739  0.996  1.0
  Mn  Mn8  1  0.953  0.414  0.664  1.0
  Mn  Mn9  1  0.547  0.914  0.664  1.0
  Mn  Mn10  1  0.453  0.086  0.336  1.0
  Mn  Mn11  1  0.047  0.586  0.336  1.0
  Mn  Mn12  1  0.635  0.274  0.515  1.0
  Mn  Mn13  1  0.865  0.774  0.515  1.0
  Mn  Mn14  1  0.135  0.226  0.485  1.0
  Mn  Mn15  1  0.365  0.726  0.485  1.0
  C  C16  1  0.355  0.350  0.717  1.0
  C  C17  1  0.762  0.065  0.849  1.0
  C  C18  1  0.262  0.435  0.151  1.0
  C  C19  1  0.145  0.850  0.717  1.0
  C  C20  1  0.855  0.150  0.283  1.0
  C  C21  1  0.738  0.565  0.849  1.0
  C  C22  1  0.238  0.935  0.151  1.0
  C  C23  1  0.645  0.650  0.283  1.0
  O  O24  1  0.512  0.382  0.645  1.0
  O  O25  1  0.408  0.129  0.513  1.0
  O  O26  1  0.321  0.399  0.815  1.0
  O  O27  1  0.216  0.268  0.695  1.0
  O  O28  1  0.761  0.444  0.969  1.0
  O  O29  1  0.701  0.069  0.730  1.0
  O  O30  1  0.853  0.185  0.851  1.0
  O  O31  1  0.988  0.882  0.645  1.0
  O  O32  1  0.092  0.629  0.513  1.0
  O  O33  1  0.179  0.899  0.815  1.0
  O  O34  1  0.284  0.768  0.695  1.0
  O  O35  1  0.353  0.315  0.149  1.0
  O  O36  1  0.201  0.431  0.270  1.0
  O  O37  1  0.739  0.944  0.969  1.0
  O  O38  1  0.261  0.056  0.031  1.0
  O  O39  1  0.799  0.569  0.730  1.0
  O  O40  1  0.647  0.685  0.851  1.0
  O  O41  1  0.716  0.232  0.305  1.0
  O  O42  1  0.821  0.101  0.185  1.0
  O  O43  1  0.908  0.371  0.487  1.0
  O  O44  1  0.012  0.118  0.355  1.0
  O  O45  1  0.147  0.815  0.149  1.0
  O  O46  1  0.299  0.931  0.270  1.0
  O  O47  1  0.239  0.556  0.031  1.0
  O  O48  1  0.784  0.732  0.305  1.0
  O  O49  1  0.679  0.601  0.185  1.0
  O  O50  1  0.592  0.871  0.487  1.0
  O  O51  1  0.488  0.618  0.355  1.0
[/CIF]
.
The structure described by Li2Mn2C2O7 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 trigonal non-coplanar geometry to one O(3), one O(5), and one O(7) atom. 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 distorted LiO4 tetrahedra that share  a cornercorner with one Mn(2)O5 square pyramid and  an edgeedge with one Mn(1)O5 trigonal bipyramid. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), one O(6), one O(7), and two equivalent O(2) atoms to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mn(2)O5 square pyramids, edges with two equivalent Mn(2)O5 square pyramids,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. In the second Mn site, Mn(2) is bonded to one O(1), one O(4), one O(6), and two equivalent O(2) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mn(2)O5 square pyramids,  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, and edges with two equivalent Mn(1)O5 trigonal bipyramids. 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(3), and one O(4) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(5), 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 distorted bent 120 degrees geometry to one Mn(2) and one C(1) atom. In the second O site, O(2) is bonded to two equivalent Mn(1) and two equivalent Mn(2) atoms to form a mixture of edge and corner-sharing OMn4 tetrahedra. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Li(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Li(2), one Mn(1), one Mn(2), and one C(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(1), one Li(2), and one C(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one C(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Mn(1), and one C(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2Mn2C2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.853
_cell_length_b   9.627
_cell_length_c   10.336
_cell_angle_alpha   64.583
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   615.941
_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  0.253  0.261  0.004  1.0
  Li  Li1  1  0.646  0.424  0.149  1.0
  Li  Li2  1  0.146  0.076  0.851  1.0
  Li  Li3  1  0.753  0.239  0.996  1.0
  Li  Li4  1  0.247  0.761  0.004  1.0
  Li  Li5  1  0.854  0.924  0.149  1.0
  Li  Li6  1  0.354  0.576  0.851  1.0
  Li  Li7  1  0.747  0.739  0.996  1.0
  Mn  Mn8  1  0.953  0.414  0.664  1.0
  Mn  Mn9  1  0.547  0.914  0.664  1.0
  Mn  Mn10  1  0.453  0.086  0.336  1.0
  Mn  Mn11  1  0.047  0.586  0.336  1.0
  Mn  Mn12  1  0.635  0.274  0.515  1.0
  Mn  Mn13  1  0.865  0.774  0.515  1.0
  Mn  Mn14  1  0.135  0.226  0.485  1.0
  Mn  Mn15  1  0.365  0.726  0.485  1.0
  C  C16  1  0.355  0.350  0.717  1.0
  C  C17  1  0.762  0.065  0.849  1.0
  C  C18  1  0.262  0.435  0.151  1.0
  C  C19  1  0.145  0.850  0.717  1.0
  C  C20  1  0.855  0.150  0.283  1.0
  C  C21  1  0.738  0.565  0.849  1.0
  C  C22  1  0.238  0.935  0.151  1.0
  C  C23  1  0.645  0.650  0.283  1.0
  O  O24  1  0.512  0.382  0.645  1.0
  O  O25  1  0.408  0.129  0.513  1.0
  O  O26  1  0.321  0.399  0.815  1.0
  O  O27  1  0.216  0.268  0.695  1.0
  O  O28  1  0.761  0.444  0.969  1.0
  O  O29  1  0.701  0.069  0.730  1.0
  O  O30  1  0.853  0.185  0.851  1.0
  O  O31  1  0.988  0.882  0.645  1.0
  O  O32  1  0.092  0.629  0.513  1.0
  O  O33  1  0.179  0.899  0.815  1.0
  O  O34  1  0.284  0.768  0.695  1.0
  O  O35  1  0.353  0.315  0.149  1.0
  O  O36  1  0.201  0.431  0.270  1.0
  O  O37  1  0.739  0.944  0.969  1.0
  O  O38  1  0.261  0.056  0.031  1.0
  O  O39  1  0.799  0.569  0.730  1.0
  O  O40  1  0.647  0.685  0.851  1.0
  O  O41  1  0.716  0.232  0.305  1.0
  O  O42  1  0.821  0.101  0.185  1.0
  O  O43  1  0.908  0.371  0.487  1.0
  O  O44  1  0.012  0.118  0.355  1.0
  O  O45  1  0.147  0.815  0.149  1.0
  O  O46  1  0.299  0.931  0.270  1.0
  O  O47  1  0.239  0.556  0.031  1.0
  O  O48  1  0.784  0.732  0.305  1.0
  O  O49  1  0.679  0.601  0.185  1.0
  O  O50  1  0.592  0.871  0.487  1.0
  O  O51  1  0.488  0.618  0.355  1.0
[/CIF]
.