data_Os2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.77
_cell_length_b   2.77
_cell_length_c   5.43
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Os2C
_chemical_formula_sum   'Os2 C1'
_cell_volume   36.08
_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
  Os  Os1  1  0.0  0.6  0.43  1.0
  Os  Os2  1  0.0  0.6  0.0  1.0
  C  C0  1  0.0  0.0  0.0  1.0

data_Os2C
_symmetry_space_group_name_H-M   Cm
_cell_length_a   2.77
_cell_length_b   4.8
_cell_length_c   5.43
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Os2C
_chemical_formula_sum   'Os4 C2'
_cell_volume   72.15
_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
  Os  Os0  2  0.1  0.5  0.0  1.0
  Os  Os1  2  0.1  0.5  0.43  1.0
  C  C2  2  0.0  0.0  0.0  1.0

Os Os C
Os2C crystallizes in the monoclinic Cm space group. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded in a 10-coordinate geometry to two equivalent Os(2), six equivalent Os(1), and two equivalent C(1) atoms. There is one shorter (2.34 Å) and one longer (3.09 Å) Os(1)-Os(2) bond length. All Os(1)-Os(1) bond lengths are 2.77 Å. There is one shorter (2.60 Å) and one longer (2.88 Å) Os(1)-C(1) bond length. In the second Os site, Os(2) is bonded in a distorted linear geometry to two equivalent Os(1) and two equivalent C(1) atoms. There is one shorter (1.11 Å) and one longer (1.66 Å) Os(2)-C(1) bond length. C(1) is bonded in a distorted linear geometry to two equivalent Os(1) and two equivalent Os(2) atoms.