data_K2FeAu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.64
_cell_length_b   3.64
_cell_length_c   9.12
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2FeAu
_chemical_formula_sum   'K2 Fe1 Au1'
_cell_volume   121.03
_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  0.82  0.82  0.44  1.0
  K  K3  1  0.82  0.82  0.67  1.0
  Fe  Fe1  1  0.0  0.0  0.0  1.0
  Au  Au0  1  0.0  0.0  0.56  1.0

data_K2FeAu
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.15
_cell_length_b   5.15
_cell_length_c   9.12
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2FeAu
_chemical_formula_sum   'K4 Fe2 Au2'
_cell_volume   242.06
_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  0.32  0.5  0.44  1.0
  K  K1  2  0.32  0.5  0.67  1.0
  Fe  Fe2  2  0.0  0.0  0.0  1.0
  Au  Au3  2  0.0  0.0  0.56  1.0

K K Fe Au
K2FeAu crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two K2FeAu clusters. There are two inequivalent K sites. In the first K site, K(1) is bonded in a single-bond geometry to one Au(1) atom. The K(1)-Au(1) bond length is 1.39 Å. In the second K site, K(2) is bonded in a single-bond geometry to one Fe(1) and one Au(1) atom. The K(2)-Fe(1) bond length is 3.12 Å. The K(2)-Au(1) bond length is 1.39 Å. Fe(1) is bonded in a distorted single-bond geometry to one K(2) atom. Au(1) is bonded in a water-like geometry to one K(1) and one K(2) atom.