data_SrSi2Os
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.91
_cell_length_b   8.91
_cell_length_c   8.91
_cell_angle_alpha   20.44
_cell_angle_beta   20.44
_cell_angle_gamma   20.44
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrSi2Os
_chemical_formula_sum   'Sr1 Si2 Os1'
_cell_volume   75.48
_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  0.01  1.0
  Si  Si1  1  0.0  0.0  0.1  1.0
  Si  Si2  1  0.0  0.0  0.99  1.0
  Os  Os0  1  0.0  0.0  0.15  1.0

data_SrSi2Os
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.48
_cell_length_b   3.16
_cell_length_c   8.91
_cell_angle_alpha   90.0
_cell_angle_beta   101.82
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrSi2Os
_chemical_formula_sum   'Sr2 Si4 Os2'
_cell_volume   150.96
_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  0.99  1.0
  Si  Si1  2  0.0  0.0  0.01  1.0
  Si  Si2  2  0.0  0.0  0.9  1.0
  Os  Os3  2  0.0  0.0  0.85  1.0

Sr Si Si Os
Sr Si Si Os 0 2 o o - 1 3 o o o 
SrOsSi2 is Cyanogen Chloride-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two SrOsSi2 clusters. Sr(1) is bonded in a linear geometry to one Si(1) and one Si(2) atom. The Sr(1)-Si(1) bond length is 0.85 Å. The Sr(1)-Si(2) bond length is 0.20 Å. Os(1) is bonded in a single-bond geometry to one Si(1) atom. The Os(1)-Si(1) bond length is 0.41 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a linear geometry to one Sr(1) and one Os(1) atom. In the second Si site, Si(2) is bonded in a single-bond geometry to one Sr(1) atom.