The structure described by (BaC2O4)4O2 crystallizes in the triclinic P-1 space group. The structure consists of one hydrogen peroxide molecule inside a BaC2O4 framework. In the BaC2O4 framework, there are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), two equivalent O(6), and two equivalent O(7) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), two equivalent O(1), and two equivalent O(8) 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(1) and one O(7) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(5) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(4) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Ba(2) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one C(3) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one C(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one C(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one C(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one C(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Ba(2) and one C(4) atom. is represented by the CIF card [CIF]
data_Ba2C4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.314
_cell_length_b   8.768
_cell_length_c   9.552
_cell_angle_alpha   64.416
_cell_angle_beta   84.636
_cell_angle_gamma   83.425
_symmetry_Int_Tables_number   1
_cell_volume   473.232
_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
  Ba  Ba0  1  0.210  0.141  0.572  1.0
  Ba  Ba1  1  0.790  0.859  0.428  1.0
  Ba  Ba2  1  0.720  0.470  0.199  1.0
  Ba  Ba3  1  0.280  0.530  0.801  1.0
  C  C4  1  0.386  0.209  0.193  1.0
  C  C5  1  0.614  0.791  0.807  1.0
  C  C6  1  0.330  0.684  0.372  1.0
  C  C7  1  0.670  0.316  0.628  1.0
  C  C8  1  0.188  0.587  0.316  1.0
  C  C9  1  0.812  0.413  0.684  1.0
  C  C10  1  0.138  0.221  0.188  1.0
  C  C11  1  0.862  0.779  0.812  1.0
  O  O12  1  0.488  0.297  0.068  1.0
  O  O13  1  0.512  0.703  0.932  1.0
  O  O14  1  0.280  0.461  0.296  1.0
  O  O15  1  0.720  0.539  0.704  1.0
  O  O16  1  0.239  0.741  0.465  1.0
  O  O17  1  0.761  0.259  0.535  1.0
  O  O18  1  0.009  0.365  0.697  1.0
  O  O19  1  0.991  0.635  0.303  1.0
  O  O20  1  0.475  0.309  0.675  1.0
  O  O21  1  0.525  0.691  0.325  1.0
  O  O22  1  0.030  0.143  0.316  1.0
  O  O23  1  0.970  0.857  0.684  1.0
  O  O24  1  0.469  0.121  0.324  1.0
  O  O25  1  0.531  0.879  0.676  1.0
  O  O26  1  0.056  0.314  0.060  1.0
  O  O27  1  0.944  0.686  0.940  1.0
  O  O28  1  0.914  0.011  0.032  1.0
  O  O29  1  0.086  0.989  0.968  1.0
[/CIF]
.
The structure described by (BaC2O4)4O2 crystallizes in the triclinic P-1 space group. The structure consists of one hydrogen peroxide molecule inside a BaC2O4 framework. In the BaC2O4 framework, there are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), two equivalent O(6), and two equivalent O(7) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), two equivalent O(1), and two equivalent O(8) 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(1) and one O(7) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(5) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(4) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Ba(2) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one C(3) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one C(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one C(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one C(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one C(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Ba(2) and one C(4) atom. is represented by the CIF card [CIF]
data_Ba2C4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.314
_cell_length_b   8.768
_cell_length_c   9.552
_cell_angle_alpha   64.416
_cell_angle_beta   84.636
_cell_angle_gamma   83.425
_symmetry_Int_Tables_number   1
_cell_volume   473.232
_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
  Ba  Ba0  1  0.210  0.141  0.572  1.0
  Ba  Ba1  1  0.790  0.859  0.428  1.0
  Ba  Ba2  1  0.720  0.470  0.199  1.0
  Ba  Ba3  1  0.280  0.530  0.801  1.0
  C  C4  1  0.386  0.209  0.193  1.0
  C  C5  1  0.614  0.791  0.807  1.0
  C  C6  1  0.330  0.684  0.372  1.0
  C  C7  1  0.670  0.316  0.628  1.0
  C  C8  1  0.188  0.587  0.316  1.0
  C  C9  1  0.812  0.413  0.684  1.0
  C  C10  1  0.138  0.221  0.188  1.0
  C  C11  1  0.862  0.779  0.812  1.0
  O  O12  1  0.488  0.297  0.068  1.0
  O  O13  1  0.512  0.703  0.932  1.0
  O  O14  1  0.280  0.461  0.296  1.0
  O  O15  1  0.720  0.539  0.704  1.0
  O  O16  1  0.239  0.741  0.465  1.0
  O  O17  1  0.761  0.259  0.535  1.0
  O  O18  1  0.009  0.365  0.697  1.0
  O  O19  1  0.991  0.635  0.303  1.0
  O  O20  1  0.475  0.309  0.675  1.0
  O  O21  1  0.525  0.691  0.325  1.0
  O  O22  1  0.030  0.143  0.316  1.0
  O  O23  1  0.970  0.857  0.684  1.0
  O  O24  1  0.469  0.121  0.324  1.0
  O  O25  1  0.531  0.879  0.676  1.0
  O  O26  1  0.056  0.314  0.060  1.0
  O  O27  1  0.944  0.686  0.940  1.0
  O  O28  1  0.914  0.011  0.032  1.0
  O  O29  1  0.086  0.989  0.968  1.0
[/CIF]
.