data_SnAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.6
_cell_length_b   5.6
_cell_length_c   5.35
_cell_angle_alpha   113.17
_cell_angle_beta   113.17
_cell_angle_gamma   36.78
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SnAs3
_chemical_formula_sum   'Sn1 As3'
_cell_volume   91.4
_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
  Sn  Sn3  1  0.2  0.0  0.44  1.0
  As  As0  1  0.0  0.0  0.0  1.0
  As  As1  1  0.28  0.0  0.73  1.0
  As  As2  1  0.12  0.0  0.14  1.0

data_SnAs3
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.53
_cell_length_b   5.35
_cell_length_c   5.6
_cell_angle_alpha   113.17
_cell_angle_beta   108.39
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SnAs3
_chemical_formula_sum   'Sn1 As3'
_cell_volume   91.4
_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
  Sn  Sn0  1  0.0  0.44  0.2  1.0
  As  As1  1  0.0  0.0  0.0  1.0
  As  As2  1  0.0  0.14  0.12  1.0
  As  As3  1  0.0  0.73  0.28  1.0

Sn As As As
Sn As As As 0 3 o o o 0 2 o o o 1 3 o o o 
SnAs3 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one SnAs3 cluster. Sn(1) is bonded in a linear geometry to one As(2) and one As(3) atom. The Sn(1)-As(2) bond length is 1.46 Å. The Sn(1)-As(3) bond length is 1.46 Å. There are three inequivalent As sites. In the first As site, As(1) is bonded in a single-bond geometry to one As(3) atom. The As(1)-As(3) bond length is 0.80 Å. In the second As site, As(2) is bonded in a single-bond geometry to one Sn(1) atom. In the third As site, As(3) is bonded in a bent 150 degrees geometry to one Sn(1) and one As(1) atom.