data_SrAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.02
_cell_length_b   6.19
_cell_length_c   6.24
_cell_angle_alpha   77.69
_cell_angle_beta   70.18
_cell_angle_gamma   74.26
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrAs3
_chemical_formula_sum   'Sr2 As6'
_cell_volume   208.77
_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
  Sr  Sr0  1  0.49  0.55  0.78  1.0
  Sr  Sr1  1  0.32  0.19  0.05  1.0
  As  As2  1  0.44  0.96  0.05  1.0
  As  As3  1  0.38  0.78  0.77  1.0
  As  As4  1  0.4  0.46  0.33  1.0
  As  As5  1  0.42  0.28  0.49  1.0
  As  As6  1  0.01  0.6  0.67  1.0
  As  As7  1  0.81  0.14  0.15  1.0

data_SrAs3
_symmetry_space_group_name_H-M   P-1
_cell_length_a   6.02
_cell_length_b   6.19
_cell_length_c   6.24
_cell_angle_alpha   77.69
_cell_angle_beta   70.18
_cell_angle_gamma   74.26
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SrAs3
_chemical_formula_sum   'Sr2 As6'
_cell_volume   208.77
_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
  Sr  Sr0  2  0.09  0.18  0.36  1.0
  As  As1  2  0.01  0.91  0.08  1.0
  As  As2  2  0.03  0.59  0.64  1.0
  As  As3  2  0.4  0.77  0.74  1.0

Sr Sr As As As As As As
SrAs3 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one diarsene molecule and two SrAs2 clusters. In each SrAs2 cluster, Sr(1) is bonded in a single-bond geometry to one As(1) and one As(3) atom. The Sr(1)-As(1) bond length is 1.43 Å. The Sr(1)-As(3) bond length is 3.05 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a single-bond geometry to one Sr(1) atom. In the second As site, As(3) is bonded in a distorted single-bond geometry to one Sr(1) atom.