data_SiBr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.52
_cell_length_b   3.96
_cell_length_c   6.49
_cell_angle_alpha   90.0
_cell_angle_beta   103.36
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiBr
_chemical_formula_sum   'Si2 Br2'
_cell_volume   137.99
_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
  Si  Si2  1  0.61  0.97  0.05  1.0
  Si  Si3  1  0.4  0.99  0.26  1.0
  Br  Br0  1  0.56  0.97  0.63  1.0
  Br  Br1  1  0.46  0.99  0.69  1.0

data_SiBr
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.96
_cell_length_b   5.52
_cell_length_c   6.49
_cell_angle_alpha   103.36
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SiBr
_chemical_formula_sum   'Si2 Br2'
_cell_volume   137.99
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  Si  Si0  2  0.01  0.89  0.6  1.0
  Br  Br1  2  0.01  0.95  0.03  1.0

Si Si Br Br
Si Si Br Br 0 3 o o - 0 1 o o o 1 2 o o o 2 3 o o o 
SiBr is Indium-like structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one SiBr cluster. Si(1) is bonded in a distorted single-bond geometry to one Br(1) atom. The Si(1)-Br(1) bond length is 2.35 Å. Br(1) is bonded in a water-like geometry to one Si(1) and one Br(1) atom. The Br(1)-Br(1) bond length is 0.75 Å.