data_Cu2WSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.9
_cell_length_b   8.9
_cell_length_c   8.9
_cell_angle_alpha   18.24
_cell_angle_beta   18.24
_cell_angle_gamma   18.24
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2WSe
_chemical_formula_sum   'Cu2 W1 Se1'
_cell_volume   60.44
_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  Cu0  1  0.0  0.0  0.55  1.0
  Cu  Cu1  1  0.0  0.0  0.72  1.0
  W  W3  1  0.0  0.0  0.13  1.0
  Se  Se2  1  0.0  0.0  0.0  1.0

data_Cu2WSe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.89
_cell_length_b   2.82
_cell_length_c   8.9
_cell_angle_alpha   90.0
_cell_angle_beta   100.55
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Cu2WSe
_chemical_formula_sum   'Cu4 W2 Se2'
_cell_volume   120.89
_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  2  0.0  0.0  0.28  1.0
  Cu  Cu1  2  0.0  0.0  0.45  1.0
  W  W2  2  0.0  0.0  0.87  1.0
  Se  Se3  2  0.0  0.0  0.0  1.0

Cu Cu W Se
Cu Cu W Se 0 1 o o o 2 3 o o o 
WCu2Se crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two WCu2Se clusters. W(1) is bonded in a single-bond geometry to one Se(1) atom. The W(1)-Se(1) bond length is 1.17 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a single-bond geometry to one Cu(2) atom. The Cu(1)-Cu(2) bond length is 1.51 Å. In the second Cu site, Cu(2) is bonded in a linear geometry to one Cu(1) and one Se(1) atom. The Cu(2)-Se(1) bond length is 2.53 Å. Se(1) is bonded in a distorted single-bond geometry to one W(1) and one Cu(2) atom.