data_SiNi2Au
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.82
_cell_length_b   3.82
_cell_length_c   3.52
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiNi2Au
_chemical_formula_sum   'Si1 Ni2 Au1'
_cell_volume   51.32
_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
  Si  Si3  1  0.0  0.0  0.0  1.0
  Ni  Ni1  1  0.91  0.0  0.76  1.0
  Ni  Ni2  1  0.0  0.91  0.76  1.0
  Au  Au0  1  0.91  0.91  0.0  1.0

data_SiNi2Au
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.4
_cell_length_b   5.4
_cell_length_c   3.52
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SiNi2Au
_chemical_formula_sum   'Si2 Ni4 Au2'
_cell_volume   102.64
_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
  Si  Si0  2  0.0  0.0  0.0  1.0
  Ni  Ni1  4  0.45  0.45  0.76  1.0
  Au  Au2  2  0.41  0.5  -0.0  1.0

Si Ni Ni Au
Ni2AuSi is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ni2AuSi clusters. Ni(1) is bonded in a 2-coordinate geometry to one Ni(1) and one Au(1) atom. The Ni(1)-Ni(1) bond length is 0.49 Å. The Ni(1)-Au(1) bond length is 0.91 Å. Au(1) is bonded in a single-bond geometry to two equivalent Ni(1) and one Si(1) atom. The Au(1)-Si(1) bond length is 0.49 Å. Si(1) is bonded in a single-bond geometry to one Au(1) atom.