The structure described by K2Cu(C2O5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(6), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(6), one O(9), and two equivalent O(4) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(8) and two equivalent O(9) atoms. In the second Cu site, Cu(2) is bonded in an octahedral geometry to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(7) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(8) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(5) atom. There are ten inequivalent O sites. In the first O site, O(10) is bonded in a single-bond geometry to one K(1), one K(2), and one C(2) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one C(3) atom. In the third O site, O(2) is bonded in a single-bond geometry to one C(4) atom. In the fourth O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Cu(2), and one C(1) atom. In the fifth O site, O(4) is bonded in an L-shaped geometry to two equivalent K(2) atoms. In the sixth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Cu(2), and one C(4) atom. In the seventh O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cu(2) atom. In the eighth O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom. In the ninth O site, O(8) is bonded in a water-like geometry to one Cu(1) and one C(3) atom. In the tenth O site, O(9) is bonded in a 2-coordinate geometry to one K(2), one Cu(1), and one C(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Cu(C2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.089
_cell_length_b   8.756
_cell_length_c   9.372
_cell_angle_alpha   109.014
_cell_angle_beta   102.755
_cell_angle_gamma   97.549
_symmetry_Int_Tables_number   1
_cell_volume   523.266
_cell_formula_units_Z   2
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
  K  K0  1  0.263  0.636  0.544  1.0
  K  K1  1  0.737  0.364  0.456  1.0
  K  K2  1  0.369  0.681  0.140  1.0
  K  K3  1  0.631  0.319  0.860  1.0
  Cu  Cu4  1  0.000  0.000  0.000  1.0
  Cu  Cu5  1  0.500  0.000  0.500  1.0
  C  C6  1  0.203  0.180  0.465  1.0
  C  C7  1  0.797  0.820  0.535  1.0
  C  C8  1  0.058  0.324  0.152  1.0
  C  C9  1  0.942  0.676  0.848  1.0
  C  C10  1  0.263  0.281  0.173  1.0
  C  C11  1  0.737  0.719  0.827  1.0
  C  C12  1  0.103  0.990  0.361  1.0
  C  C13  1  0.897  0.010  0.639  1.0
  O  O14  1  0.417  0.390  0.248  1.0
  O  O15  1  0.583  0.610  0.752  1.0
  O  O16  1  0.072  0.044  0.724  1.0
  O  O17  1  0.928  0.956  0.276  1.0
  O  O18  1  0.387  0.210  0.537  1.0
  O  O19  1  0.613  0.790  0.463  1.0
  O  O20  1  0.217  0.329  0.867  1.0
  O  O21  1  0.783  0.671  0.133  1.0
  O  O22  1  0.210  0.885  0.368  1.0
  O  O23  1  0.790  0.115  0.632  1.0
  O  O24  1  0.546  0.017  0.324  1.0
  O  O25  1  0.454  0.983  0.676  1.0
  O  O26  1  0.102  0.286  0.466  1.0
  O  O27  1  0.898  0.714  0.534  1.0
  O  O28  1  0.260  0.124  0.109  1.0
  O  O29  1  0.740  0.876  0.891  1.0
  O  O30  1  0.911  0.197  0.064  1.0
  O  O31  1  0.089  0.803  0.936  1.0
  O  O32  1  0.036  0.465  0.214  1.0
  O  O33  1  0.964  0.535  0.786  1.0
[/CIF]
.
The structure described by K2Cu(C2O5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(6), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(6), one O(9), and two equivalent O(4) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(8) and two equivalent O(9) atoms. In the second Cu site, Cu(2) is bonded in an octahedral geometry to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(7) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(8) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(5) atom. There are ten inequivalent O sites. In the first O site, O(10) is bonded in a single-bond geometry to one K(1), one K(2), and one C(2) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one C(3) atom. In the third O site, O(2) is bonded in a single-bond geometry to one C(4) atom. In the fourth O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Cu(2), and one C(1) atom. In the fifth O site, O(4) is bonded in an L-shaped geometry to two equivalent K(2) atoms. In the sixth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Cu(2), and one C(4) atom. In the seventh O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cu(2) atom. In the eighth O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom. In the ninth O site, O(8) is bonded in a water-like geometry to one Cu(1) and one C(3) atom. In the tenth O site, O(9) is bonded in a 2-coordinate geometry to one K(2), one Cu(1), and one C(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Cu(C2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.089
_cell_length_b   8.756
_cell_length_c   9.372
_cell_angle_alpha   109.014
_cell_angle_beta   102.755
_cell_angle_gamma   97.549
_symmetry_Int_Tables_number   1
_cell_volume   523.266
_cell_formula_units_Z   2
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
  K  K0  1  0.263  0.636  0.544  1.0
  K  K1  1  0.737  0.364  0.456  1.0
  K  K2  1  0.369  0.681  0.140  1.0
  K  K3  1  0.631  0.319  0.860  1.0
  Cu  Cu4  1  0.000  0.000  0.000  1.0
  Cu  Cu5  1  0.500  0.000  0.500  1.0
  C  C6  1  0.203  0.180  0.465  1.0
  C  C7  1  0.797  0.820  0.535  1.0
  C  C8  1  0.058  0.324  0.152  1.0
  C  C9  1  0.942  0.676  0.848  1.0
  C  C10  1  0.263  0.281  0.173  1.0
  C  C11  1  0.737  0.719  0.827  1.0
  C  C12  1  0.103  0.990  0.361  1.0
  C  C13  1  0.897  0.010  0.639  1.0
  O  O14  1  0.417  0.390  0.248  1.0
  O  O15  1  0.583  0.610  0.752  1.0
  O  O16  1  0.072  0.044  0.724  1.0
  O  O17  1  0.928  0.956  0.276  1.0
  O  O18  1  0.387  0.210  0.537  1.0
  O  O19  1  0.613  0.790  0.463  1.0
  O  O20  1  0.217  0.329  0.867  1.0
  O  O21  1  0.783  0.671  0.133  1.0
  O  O22  1  0.210  0.885  0.368  1.0
  O  O23  1  0.790  0.115  0.632  1.0
  O  O24  1  0.546  0.017  0.324  1.0
  O  O25  1  0.454  0.983  0.676  1.0
  O  O26  1  0.102  0.286  0.466  1.0
  O  O27  1  0.898  0.714  0.534  1.0
  O  O28  1  0.260  0.124  0.109  1.0
  O  O29  1  0.740  0.876  0.891  1.0
  O  O30  1  0.911  0.197  0.064  1.0
  O  O31  1  0.089  0.803  0.936  1.0
  O  O32  1  0.036  0.465  0.214  1.0
  O  O33  1  0.964  0.535  0.786  1.0
[/CIF]
.