data_SrSi2Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.26
_cell_length_b   8.26
_cell_length_c   8.26
_cell_angle_alpha   27.57
_cell_angle_beta   27.57
_cell_angle_gamma   27.57
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrSi2Sb
_chemical_formula_sum   'Sr1 Si2 Sb1'
_cell_volume   106.48
_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
  Sr  Sr3  1  0.0  0.0  0.0  1.0
  Si  Si1  1  0.0  0.0  0.2  1.0
  Si  Si2  1  0.0  0.0  0.61  1.0
  Sb  Sb0  1  0.0  0.0  0.91  1.0

data_SrSi2Sb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.82
_cell_length_b   3.94
_cell_length_c   8.26
_cell_angle_alpha   90.0
_cell_angle_beta   105.97
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrSi2Sb
_chemical_formula_sum   'Sr2 Si4 Sb2'
_cell_volume   212.95
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Sr  Sr0  2  0.0  0.0  0.0  1.0
  Si  Si1  2  -0.0  0.0  0.8  1.0
  Si  Si2  2  -0.0  0.0  0.39  1.0
  Sb  Sb3  2  -0.0  0.0  0.09  1.0

Sr Si Si Sb
Sr Si Si Sb 0 3 o o - 0 1 o o o 2 3 o o o 
SrSi2Sb crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two SrSi2Sb clusters. Sr(1) is bonded in a linear geometry to one Si(1) and one Sb(1) atom. The Sr(1)-Si(1) bond length is 1.69 Å. The Sr(1)-Sb(1) bond length is 0.76 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a single-bond geometry to one Sr(1) atom. In the second Si site, Si(2) is bonded in a single-bond geometry to one Sb(1) atom. The Si(2)-Sb(1) bond length is 2.45 Å. Sb(1) is bonded in a single-bond geometry to one Sr(1) and one Si(2) atom.