The compound described by BaC2O4 crystallizes in the orthorhombic P2_12_12_1 space group. Ba(1) is bonded in a 6-coordinate geometry to one C(2), one O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a linear geometry to one O(1) and one O(2) atom. In the second C site, C(2) is bonded in a bent 120 degrees geometry to one Ba(1), 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 single-bond geometry to one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(2) atom. is represented by the CIF file [CIF]
data_Ba(CO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.861
_cell_length_b   8.482
_cell_length_c   8.742
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   508.687
_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
  Ba  Ba0  1  0.459  0.911  0.597  1.0
  Ba  Ba1  1  0.959  0.589  0.403  1.0
  Ba  Ba2  1  0.541  0.411  0.903  1.0
  Ba  Ba3  1  0.041  0.089  0.097  1.0
  C  C4  1  0.150  0.739  0.870  1.0
  C  C5  1  0.650  0.761  0.130  1.0
  C  C6  1  0.850  0.239  0.630  1.0
  C  C7  1  0.350  0.261  0.370  1.0
  C  C8  1  0.600  0.574  0.557  1.0
  C  C9  1  0.100  0.926  0.443  1.0
  C  C10  1  0.400  0.074  0.943  1.0
  C  C11  1  0.900  0.426  0.057  1.0
  O  O12  1  0.011  0.803  0.824  1.0
  O  O13  1  0.511  0.697  0.176  1.0
  O  O14  1  0.989  0.303  0.676  1.0
  O  O15  1  0.489  0.197  0.324  1.0
  O  O16  1  0.297  0.682  0.911  1.0
  O  O17  1  0.797  0.818  0.089  1.0
  O  O18  1  0.703  0.182  0.589  1.0
  O  O19  1  0.203  0.318  0.411  1.0
  O  O20  1  0.728  0.596  0.667  1.0
  O  O21  1  0.228  0.904  0.333  1.0
  O  O22  1  0.272  0.096  0.833  1.0
  O  O23  1  0.772  0.404  0.167  1.0
  O  O24  1  0.417  0.576  0.599  1.0
  O  O25  1  0.917  0.924  0.401  1.0
  O  O26  1  0.583  0.076  0.901  1.0
  O  O27  1  0.083  0.424  0.099  1.0
[/CIF]
.
The compound described by BaC2O4 crystallizes in the orthorhombic P2_12_12_1 space group. Ba(1) is bonded in a 6-coordinate geometry to one C(2), one O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a linear geometry to one O(1) and one O(2) atom. In the second C site, C(2) is bonded in a bent 120 degrees geometry to one Ba(1), 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 single-bond geometry to one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(2) atom. is represented by the CIF file [CIF]
data_Ba(CO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.861
_cell_length_b   8.482
_cell_length_c   8.742
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   508.687
_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
  Ba  Ba0  1  0.459  0.911  0.597  1.0
  Ba  Ba1  1  0.959  0.589  0.403  1.0
  Ba  Ba2  1  0.541  0.411  0.903  1.0
  Ba  Ba3  1  0.041  0.089  0.097  1.0
  C  C4  1  0.150  0.739  0.870  1.0
  C  C5  1  0.650  0.761  0.130  1.0
  C  C6  1  0.850  0.239  0.630  1.0
  C  C7  1  0.350  0.261  0.370  1.0
  C  C8  1  0.600  0.574  0.557  1.0
  C  C9  1  0.100  0.926  0.443  1.0
  C  C10  1  0.400  0.074  0.943  1.0
  C  C11  1  0.900  0.426  0.057  1.0
  O  O12  1  0.011  0.803  0.824  1.0
  O  O13  1  0.511  0.697  0.176  1.0
  O  O14  1  0.989  0.303  0.676  1.0
  O  O15  1  0.489  0.197  0.324  1.0
  O  O16  1  0.297  0.682  0.911  1.0
  O  O17  1  0.797  0.818  0.089  1.0
  O  O18  1  0.703  0.182  0.589  1.0
  O  O19  1  0.203  0.318  0.411  1.0
  O  O20  1  0.728  0.596  0.667  1.0
  O  O21  1  0.228  0.904  0.333  1.0
  O  O22  1  0.272  0.096  0.833  1.0
  O  O23  1  0.772  0.404  0.167  1.0
  O  O24  1  0.417  0.576  0.599  1.0
  O  O25  1  0.917  0.924  0.401  1.0
  O  O26  1  0.583  0.076  0.901  1.0
  O  O27  1  0.083  0.424  0.099  1.0
[/CIF]
.