data_SnSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.55
_cell_length_b   5.55
_cell_length_c   8.74
_cell_angle_alpha   107.41
_cell_angle_beta   107.41
_cell_angle_gamma   46.22
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SnSe2
_chemical_formula_sum   'Sn2 Se4'
_cell_volume   183.91
_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
  Sn  Sn4  1  0.36  0.0  0.14  1.0
  Sn  Sn5  1  0.01  0.0  0.12  1.0
  Se  Se0  1  0.36  0.0  0.25  1.0
  Se  Se1  1  0.3  0.0  0.21  1.0
  Se  Se2  1  0.07  0.0  0.05  1.0
  Se  Se3  1  0.01  0.0  0.01  1.0

data_SnSe2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   4.36
_cell_length_b   5.55
_cell_length_c   8.74
_cell_angle_alpha   107.41
_cell_angle_beta   90.0
_cell_angle_gamma   113.11
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SnSe2
_chemical_formula_sum   'Sn2 Se4'
_cell_volume   183.91
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  Sn  Sn0  2  0.0  0.33  0.49  1.0
  Se  Se1  2  0.0  0.33  0.38  1.0
  Se  Se2  2  0.0  0.39  0.42  1.0

Sn Sn Se Se Se Se
SnSe2 is Cubic alpha N2-like structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two SnSe2 clusters. Sn(1) is bonded in a single-bond geometry to one Se(1) and one Se(2) atom. The Sn(1)-Se(1) bond length is 0.94 Å. The Sn(1)-Se(2) bond length is 0.76 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted single-bond geometry to one Sn(1) and one Se(2) atom. The Se(1)-Se(2) bond length is 0.40 Å. In the second Se site, Se(2) is bonded in a distorted single-bond geometry to one Sn(1) and one Se(1) atom.