data_KSn2As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.33
_cell_length_b   7.33
_cell_length_c   7.33
_cell_angle_alpha   148.0
_cell_angle_beta   140.84
_cell_angle_gamma   51.44
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KSn2As
_chemical_formula_sum   'K1 Sn2 As1'
_cell_volume   131.26
_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
  K  K1  1  0.0  0.0  0.24  1.0
  Sn  Sn2  1  0.0  0.46  0.37  1.0
  Sn  Sn3  1  0.0  0.0  0.46  1.0
  As  As0  1  0.02  0.0  0.36  1.0

data_KSn2As
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.04
_cell_length_b   4.91
_cell_length_c   7.33
_cell_angle_alpha   109.58
_cell_angle_beta   106.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KSn2As
_chemical_formula_sum   'K1 Sn2 As1'
_cell_volume   131.26
_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
  K  K0  1  0.0  0.24  0.24  1.0
  Sn  Sn1  1  0.0  0.46  0.46  1.0
  Sn  Sn2  1  0.54  0.91  0.91  1.0
  As  As3  1  0.0  0.36  0.34  1.0

K Sn Sn As
KSn2As crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one KSn2As cluster. K(1) is bonded in a distorted single-bond geometry to one Sn(1) and one As(1) atom. The K(1)-Sn(1) bond length is 2.56 Å. The K(1)-As(1) bond length is 0.78 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted single-bond geometry to one K(1) atom. In the second Sn site, Sn(2) is bonded in a single-bond geometry to one As(1) atom. The Sn(2)-As(1) bond length is 0.90 Å. As(1) is bonded in a distorted linear geometry to one K(1) and one Sn(2) atom.