The compound described by Eu2O2Br crystallizes in the monoclinic C2/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 5-coordinate geometry to two equivalent O(2), three equivalent O(1), and two equivalent Br(1) atoms. In the second Eu site, Eu(2) is bonded in a 3-coordinate geometry to one O(1), two equivalent O(2), and five equivalent Br(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form a mixture of corner and edge-sharing OEu4 trigonal pyramids. Br(1) is bonded in a 7-coordinate geometry to two equivalent Eu(1) and five equivalent Eu(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu2BrO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.721
_cell_length_b   6.721
_cell_length_c   9.662
_cell_angle_alpha   58.851
_cell_angle_beta   58.851
_cell_angle_gamma   34.536
_symmetry_Int_Tables_number   1
_cell_volume   208.015
_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
  Eu  Eu0  1  0.340  0.340  0.555  1.0
  Eu  Eu1  1  0.044  0.044  0.198  1.0
  Eu  Eu2  1  0.956  0.956  0.802  1.0
  Eu  Eu3  1  0.660  0.660  0.445  1.0
  Br  Br4  1  0.671  0.671  0.876  1.0
  Br  Br5  1  0.329  0.329  0.124  1.0
  O  O6  1  0.147  0.147  0.575  1.0
  O  O7  1  0.853  0.853  0.425  1.0
  O  O8  1  0.550  0.550  0.315  1.0
  O  O9  1  0.450  0.450  0.685  1.0
[/CIF]
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The compound described by Eu2O2Br crystallizes in the monoclinic C2/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 5-coordinate geometry to two equivalent O(2), three equivalent O(1), and two equivalent Br(1) atoms. In the second Eu site, Eu(2) is bonded in a 3-coordinate geometry to one O(1), two equivalent O(2), and five equivalent Br(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form a mixture of corner and edge-sharing OEu4 trigonal pyramids. Br(1) is bonded in a 7-coordinate geometry to two equivalent Eu(1) and five equivalent Eu(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu2BrO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.721
_cell_length_b   6.721
_cell_length_c   9.662
_cell_angle_alpha   58.851
_cell_angle_beta   58.851
_cell_angle_gamma   34.536
_symmetry_Int_Tables_number   1
_cell_volume   208.015
_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
  Eu  Eu0  1  0.340  0.340  0.555  1.0
  Eu  Eu1  1  0.044  0.044  0.198  1.0
  Eu  Eu2  1  0.956  0.956  0.802  1.0
  Eu  Eu3  1  0.660  0.660  0.445  1.0
  Br  Br4  1  0.671  0.671  0.876  1.0
  Br  Br5  1  0.329  0.329  0.124  1.0
  O  O6  1  0.147  0.147  0.575  1.0
  O  O7  1  0.853  0.853  0.425  1.0
  O  O8  1  0.550  0.550  0.315  1.0
  O  O9  1  0.450  0.450  0.685  1.0
[/CIF]
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