The structure described by Ca(CuO2)2 crystallizes in the monoclinic P2_1 space group. Ca(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted face-sharing CaO8 hexagonal bipyramids. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square co-planar geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ca(1), one Cu(1), and one Cu(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ca(1), one Cu(1), and one Cu(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ca(1), one Cu(1), and one Cu(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ca(1), one Cu(1), and one Cu(2) atom. is represented by the CIF file [CIF]
data_Ca(CuO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.382
_cell_length_b   5.456
_cell_length_c   5.849
_cell_angle_alpha   62.199
_cell_angle_beta   89.949
_cell_angle_gamma   89.891
_symmetry_Int_Tables_number   1
_cell_volume   95.461
_cell_formula_units_Z   1
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
  Ca  Ca0  1  0.500  0.899  0.702  1.0
  Cu  Cu1  1  1.000  0.351  0.799  1.0
  Cu  Cu2  1  1.000  0.620  0.259  1.0
  O  O3  1  0.997  0.545  0.981  1.0
  O  O4  1  1.000  0.265  0.524  1.0
  O  O5  1  0.003  0.974  0.981  1.0
  O  O6  1  0.000  0.710  0.524  1.0
[/CIF]
.
The structure described by Ca(CuO2)2 crystallizes in the monoclinic P2_1 space group. Ca(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted face-sharing CaO8 hexagonal bipyramids. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square co-planar geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ca(1), one Cu(1), and one Cu(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ca(1), one Cu(1), and one Cu(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ca(1), one Cu(1), and one Cu(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ca(1), one Cu(1), and one Cu(2) atom. is represented by the CIF file [CIF]
data_Ca(CuO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.382
_cell_length_b   5.456
_cell_length_c   5.849
_cell_angle_alpha   62.199
_cell_angle_beta   89.949
_cell_angle_gamma   89.891
_symmetry_Int_Tables_number   1
_cell_volume   95.461
_cell_formula_units_Z   1
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
  Ca  Ca0  1  0.500  0.899  0.702  1.0
  Cu  Cu1  1  1.000  0.351  0.799  1.0
  Cu  Cu2  1  1.000  0.620  0.259  1.0
  O  O3  1  0.997  0.545  0.981  1.0
  O  O4  1  1.000  0.265  0.524  1.0
  O  O5  1  0.003  0.974  0.981  1.0
  O  O6  1  0.000  0.710  0.524  1.0
[/CIF]
.