data_AgBiSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.76
_cell_length_b   3.96
_cell_length_c   7.05
_cell_angle_alpha   90.0
_cell_angle_beta   92.42
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AgBiSe2
_chemical_formula_sum   'Ag1 Bi1 Se2'
_cell_volume   104.98
_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
  Ag  Ag0  1  0.0  0.0  0.0  1.0
  Bi  Bi1  1  0.73  0.0  0.52  1.0
  Se  Se2  1  0.54  0.98  0.45  1.0
  Se  Se3  1  0.92  0.98  0.59  1.0

data_AgBiSe2
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.76
_cell_length_b   3.96
_cell_length_c   7.05
_cell_angle_alpha   90.0
_cell_angle_beta   92.42
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AgBiSe2
_chemical_formula_sum   'Ag1 Bi1 Se2'
_cell_volume   104.98
_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
  Ag  Ag0  1  0.0  0.0  0.0  1.0
  Bi  Bi1  1  0.73  0.0  0.52  1.0
  Se  Se2  1  0.54  0.98  0.45  1.0
  Se  Se3  1  0.92  0.98  0.59  1.0

Ag Bi Se Se
AgBiSe2 is Cyanogen Chloride-like structured and crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one AgBiSe2 cluster. Ag(1) is bonded in a single-bond geometry to one Se(2) atom. The Ag(1)-Se(2) bond length is 2.87 Å. Bi(1) is bonded in a linear geometry to one Se(1) and one Se(2) atom. The Bi(1)-Se(1) bond length is 0.86 Å. The Bi(1)-Se(2) bond length is 0.86 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a single-bond geometry to one Bi(1) atom. In the second Se site, Se(2) is bonded in a distorted single-bond geometry to one Ag(1) and one Bi(1) atom.