data_LaSiAu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.56
_cell_length_b   3.56
_cell_length_c   6.86
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   LaSiAu2
_chemical_formula_sum   'La1 Si1 Au2'
_cell_volume   86.73
_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
  La  La2  1  0.78  0.78  0.38  1.0
  Si  Si3  1  0.0  0.0  0.7  1.0
  Au  Au0  1  0.78  0.78  0.59  1.0
  Au  Au1  1  0.0  0.0  0.48  1.0

data_LaSiAu2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.03
_cell_length_b   5.03
_cell_length_c   6.86
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   LaSiAu2
_chemical_formula_sum   'La2 Si2 Au4'
_cell_volume   173.46
_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
  La  La0  2  0.28  0.5  0.38  1.0
  Si  Si1  2  0.0  0.0  0.7  1.0
  Au  Au2  2  0.0  0.0  0.48  1.0
  Au  Au3  2  0.28  0.5  0.59  1.0

La Si Au Au
La Si Au Au 0 3 + + o 0 2 o o o 1 2 - - o 1 3 o o o 2 3 + + o 
LaAu2Si crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two LaAu2Si clusters. La(1) is bonded in a 2-coordinate geometry to one Au(1) and one Au(2) atom. The La(1)-Au(1) bond length is 1.45 Å. The La(1)-Au(2) bond length is 1.32 Å. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 2-coordinate geometry to one La(1) and one Si(1) atom. The Au(1)-Si(1) bond length is 1.36 Å. In the second Au site, Au(2) is bonded in a 2-coordinate geometry to one La(1) and one Si(1) atom. The Au(2)-Si(1) bond length is 1.53 Å. Si(1) is bonded in a 2-coordinate geometry to one Au(1) and one Au(2) atom.