data_CSe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.44
_cell_length_b   5.44
_cell_length_c   5.44
_cell_angle_alpha   111.0
_cell_angle_beta   111.0
_cell_angle_gamma   106.45
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CSe4
_chemical_formula_sum   'C1 Se4'
_cell_volume   123.92
_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
  C  C0  1  0.0  0.0  0.0  1.0
  Se  Se1  1  0.08  0.0  0.63  1.0
  Se  Se2  1  0.0  0.08  0.63  1.0
  Se  Se3  1  0.0  0.0  0.84  1.0
  Se  Se4  1  0.0  0.0  0.68  1.0

data_CSe4
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.52
_cell_length_b   8.72
_cell_length_c   5.44
_cell_angle_alpha   90.0
_cell_angle_beta   126.78
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   CSe4
_chemical_formula_sum   'C2 Se8'
_cell_volume   247.84
_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
  Se  Se0  4  0.46  0.46  0.37  1.0
  C  C1  2  0.0  0.0  0.0  1.0
  Se  Se2  2  0.0  0.0  0.16  1.0
  Se  Se3  2  0.0  0.0  0.32  1.0

C Se Se Se Se
CSe4 is Indium structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two CSe4 clusters. C(1) is bonded in a single-bond geometry to one Se(2) atom. The C(1)-Se(2) bond length is 0.89 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 2-coordinate geometry to one Se(1) and one Se(3) atom. The Se(1)-Se(1) bond length is 0.73 Å. The Se(1)-Se(3) bond length is 0.62 Å. In the second Se site, Se(2) is bonded in a linear geometry to one C(1) and one Se(3) atom. The Se(2)-Se(3) bond length is 0.84 Å. In the third Se site, Se(3) is bonded in a 3-coordinate geometry to one Se(2) and two equivalent Se(1) atoms.