data_KSiAu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.98
_cell_length_b   4.98
_cell_length_c   4.98
_cell_angle_alpha   120.7
_cell_angle_beta   120.7
_cell_angle_gamma   88.8
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KSiAu2
_chemical_formula_sum   'K1 Si1 Au2'
_cell_volume   86.63
_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  0.0  0.0  0.56  1.0
  Si  Si3  1  0.0  0.0  0.0  1.0
  Au  Au0  1  0.47  0.0  0.78  1.0
  Au  Au1  1  0.0  0.47  0.78  1.0

data_KSiAu2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.97
_cell_length_b   6.97
_cell_length_c   4.98
_cell_angle_alpha   90.0
_cell_angle_beta   134.4
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   KSiAu2
_chemical_formula_sum   'K2 Si2 Au4'
_cell_volume   173.25
_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  0.56  1.0
  Si  Si1  2  0.0  0.0  0.0  1.0
  Au  Au2  4  0.27  0.27  0.31  1.0

K Si Au Au
KAu2Si crystallizes in the monoclinic Cm space group. K(1) is bonded in a 3-coordinate geometry to two equivalent Au(1) and two equivalent Si(1) atoms. Both K(1)-Au(1) bond lengths are 2.00 Å. There is one shorter (2.19 Å) and one longer (2.80 Å) K(1)-Si(1) bond length. Au(1) is bonded in a distorted linear geometry to one K(1) and one Si(1) atom. The Au(1)-Si(1) bond length is 2.30 Å. Si(1) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Au(1) atoms.