data_Cu2AsOs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.96
_cell_length_b   4.96
_cell_length_c   4.96
_cell_angle_alpha   137.33
_cell_angle_beta   137.33
_cell_angle_gamma   61.93
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2AsOs
_chemical_formula_sum   'Cu2 As1 Os1'
_cell_volume   55.24
_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
  Cu  Cu1  1  0.8  0.0  0.12  1.0
  Cu  Cu2  1  0.0  0.8  0.12  1.0
  As  As0  1  0.0  0.0  0.0  1.0
  Os  Os3  1  0.0  0.0  0.25  1.0

data_Cu2AsOs
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.1
_cell_length_b   5.1
_cell_length_c   4.96
_cell_angle_alpha   90.0
_cell_angle_beta   120.96
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Cu2AsOs
_chemical_formula_sum   'Cu4 As2 Os2'
_cell_volume   110.48
_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
  Cu  Cu0  4  0.28  0.4  0.68  1.0
  As  As1  2  0.0  0.0  0.0  1.0
  Os  Os2  2  0.25  0.5  0.75  1.0

Cu Cu As Os
OsCu2As is Indium-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two OsCu2As clusters. Os(1) is bonded in a distorted water-like geometry to two equivalent Cu(1) and one As(1) atom. Both Os(1)-Cu(1) bond lengths are 0.67 Å. The Os(1)-As(1) bond length is 1.24 Å. Cu(1) is bonded in a single-bond geometry to one Os(1) and one As(1) atom. The Cu(1)-As(1) bond length is 1.49 Å. As(1) is bonded in a 3-coordinate geometry to one Os(1) and two equivalent Cu(1) atoms.