data_Sb2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.9
_cell_length_b   4.9
_cell_length_c   8.13
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sb2Se
_chemical_formula_sum   'Sb4 Se2'
_cell_volume   169.04
_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
  Sb  Sb0  1  0.0  0.83  0.56  1.0
  Sb  Sb1  1  0.45  0.41  0.49  1.0
  Sb  Sb2  1  0.45  0.41  0.57  1.0
  Sb  Sb3  1  0.0  0.83  0.64  1.0
  Se  Se4  1  0.0  0.0  0.1  1.0
  Se  Se5  1  0.0  0.0  0.03  1.0

data_Sb2Se
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.9
_cell_length_b   4.9
_cell_length_c   8.13
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sb2Se
_chemical_formula_sum   'Sb4 Se2'
_cell_volume   169.04
_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
  Sb  Sb0  1  -0.0  0.83  0.56  1.0
  Sb  Sb1  1  -0.0  0.83  0.64  1.0
  Sb  Sb2  1  0.45  0.41  0.49  1.0
  Sb  Sb3  1  0.45  0.41  0.57  1.0
  Se  Se4  1  0.0  0.0  0.03  1.0
  Se  Se5  1  0.0  0.0  0.1  1.0

Sb Sb Sb Sb Se Se
Sb2Se crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of two diantimony molecules and one diselenium molecule.