data_K2AsCl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.86
_cell_length_b   5.86
_cell_length_c   5.86
_cell_angle_alpha   124.11
_cell_angle_beta   124.11
_cell_angle_gamma   83.02
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2AsCl
_chemical_formula_sum   'K2 As1 Cl1'
_cell_volume   132.13
_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  0.74  0.0  0.19  1.0
  K  K3  1  0.0  0.74  0.19  1.0
  As  As0  1  0.0  0.0  0.39  1.0
  Cl  Cl1  1  0.0  0.0  0.0  1.0

data_K2AsCl
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.76
_cell_length_b   7.76
_cell_length_c   5.86
_cell_angle_alpha   90.0
_cell_angle_beta   131.51
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2AsCl
_chemical_formula_sum   'K4 As2 Cl2'
_cell_volume   264.27
_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  4  0.13  0.13  0.45  1.0
  As  As1  2  0.0  0.0  0.39  1.0
  Cl  Cl2  2  0.0  0.0  0.0  1.0

K K As Cl
K K As Cl 0 2 + o o 0 3 + o o 1 2 o + o 1 3 o + o 2 3 o o o 
K2AsCl is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two K2AsCl clusters. K(1) is bonded in a distorted single-bond geometry to one As(1) and one Cl(1) atom. The K(1)-As(1) bond length is 1.27 Å. The K(1)-Cl(1) bond length is 2.33 Å. As(1) is bonded in a water-like geometry to two equivalent K(1) and one Cl(1) atom. The As(1)-Cl(1) bond length is 2.26 Å. Cl(1) is bonded in a 3-coordinate geometry to two equivalent K(1) and one As(1) atom.