data_CrCd2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.07
_cell_length_b   4.07
_cell_length_c   5.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CrCd2Se
_chemical_formula_sum   'Cr1 Cd2 Se1'
_cell_volume   83.19
_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
  Cr  Cr2  1  0.0  0.0  0.0  1.0
  Cd  Cd0  1  0.04  0.0  0.51  1.0
  Cd  Cd1  1  0.0  0.04  0.51  1.0
  Se  Se3  1  0.04  0.04  0.0  1.0

data_CrCd2Se
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.76
_cell_length_b   5.76
_cell_length_c   5.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   CrCd2Se
_chemical_formula_sum   'Cr2 Cd4 Se2'
_cell_volume   166.38
_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
  Cr  Cr0  2  0.0  0.0  0.0  1.0
  Cd  Cd1  4  0.02  0.02  0.51  1.0
  Se  Se2  2  0.04  0.0  0.0  1.0

Cr Cd Cd Se
(Cd)2CrSe is alpha carbon monoxide-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two cadmium molecules and two CrSe clusters. In each CrSe cluster, Cr(1) is bonded in a single-bond geometry to one Se(1) atom. The Cr(1)-Se(1) bond length is 0.20 Å. Se(1) is bonded in a single-bond geometry to one Cr(1) atom.