data_K2AsCl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.68
_cell_length_b   4.68
_cell_length_c   6.9
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2AsCl
_chemical_formula_sum   'K2 As1 Cl1'
_cell_volume   151.25
_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  K2  1  0.34  0.34  0.06  1.0
  K  K3  1  0.0  0.0  0.42  1.0
  As  As0  1  0.34  0.34  0.64  1.0
  Cl  Cl1  1  0.0  0.0  0.13  1.0

data_K2AsCl
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.62
_cell_length_b   6.62
_cell_length_c   6.9
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2AsCl
_chemical_formula_sum   'K4 As2 Cl2'
_cell_volume   302.49
_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
  K  K0  2  0.0  0.0  0.42  1.0
  K  K1  2  0.34  0.0  0.06  1.0
  As  As2  2  0.34  0.0  0.64  1.0
  Cl  Cl3  2  0.0  0.0  0.13  1.0

K K As Cl
K2AsCl crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to one As(1) and three equivalent Cl(1) atoms. The K(1)-As(1) bond length is 2.91 Å. There is one shorter (2.30 Å) and two longer (3.51 Å) K(1)-Cl(1) bond lengths. In the second K site, K(2) is bonded in a 2-coordinate geometry to one As(1) and one Cl(1) atom. The K(2)-As(1) bond length is 2.72 Å. The K(2)-Cl(1) bond length is 2.00 Å. As(1) is bonded in a 2-coordinate geometry to one K(1) and one K(2) atom. Cl(1) is bonded in a distorted water-like geometry to one K(2) and three equivalent K(1) atoms.