data_TaAlAu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.99
_cell_length_b   4.99
_cell_length_c   4.99
_cell_angle_alpha   130.93
_cell_angle_beta   130.93
_cell_angle_gamma   71.92
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TaAlAu2
_chemical_formula_sum   'Ta1 Al1 Au2'
_cell_volume   69.32
_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
  Ta  Ta3  1  0.0  0.0  0.04  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  Au  Au1  1  0.07  0.0  0.02  1.0
  Au  Au2  1  0.0  0.07  0.02  1.0

data_TaAlAu2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.86
_cell_length_b   5.86
_cell_length_c   4.99
_cell_angle_alpha   90.0
_cell_angle_beta   125.96
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   TaAlAu2
_chemical_formula_sum   'Ta2 Al2 Au4'
_cell_volume   138.63
_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
  Ta  Ta0  2  0.46  0.5  0.96  1.0
  Al  Al1  2  0.0  0.0  0.0  1.0
  Au  Au2  4  0.02  0.04  0.05  1.0

Ta Al Au Au
TaAu2Al is Ammonia-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two TaAu2Al clusters. Ta(1) is bonded in a single-bond geometry to one Al(1) atom. The Ta(1)-Al(1) bond length is 0.19 Å. Au(1) is bonded in a single-bond geometry to one Al(1) atom. The Au(1)-Al(1) bond length is 0.30 Å. Al(1) is bonded in a distorted trigonal non-coplanar geometry to one Ta(1) and two equivalent Au(1) atoms.