data_Re2Os
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.24
_cell_length_b   3.24
_cell_length_c   8.62
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Re2Os
_chemical_formula_sum   'Re4 Os2'
_cell_volume   90.41
_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
  Re  Re2  1  0.62  0.0  0.1  1.0
  Re  Re3  1  0.0  0.62  0.58  1.0
  Re  Re4  1  0.62  0.0  0.04  1.0
  Re  Re5  1  0.0  0.62  0.51  1.0
  Os  Os0  1  0.62  0.0  0.89  1.0
  Os  Os1  1  0.0  0.62  0.73  1.0

data_Re2Os
_symmetry_space_group_name_H-M   C2/m
_cell_length_a   4.58
_cell_length_b   4.58
_cell_length_c   8.62
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   12
_chemical_formula_structural   Re2Os
_chemical_formula_sum   'Re8 Os4'
_cell_volume   180.83
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
  3  '-x, y, -z'
  4  'x, -y, z'
  5  'x+1/2, y+1/2, z'
  6  '-x+1/2, -y+1/2, -z'
  7  '-x+1/2, y+1/2, -z'
  8  '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
  Re  Re0  4  0.19  0.0  0.2  1.0
  Re  Re1  4  0.19  0.0  0.27  1.0
  Os  Os2  4  0.19  0.0  0.42  1.0

Re Re Re Re Os Os
Re2Os is Cyanogen Chloride-derived structured and crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of four Re2Os clusters. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded in a single-bond geometry to one Re(2) atom. The Re(1)-Re(2) bond length is 0.57 Å. In the second Re site, Re(2) is bonded in a linear geometry to one Re(1) and one Os(1) atom. The Re(2)-Os(1) bond length is 1.31 Å. Os(1) is bonded in a single-bond geometry to one Re(2) atom.