data_Ta2HgCl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.08
_cell_length_b   4.08
_cell_length_c   4.73
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta2HgCl
_chemical_formula_sum   'Ta2 Hg1 Cl1'
_cell_volume   78.84
_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  Ta2  1  0.04  0.0  0.36  1.0
  Ta  Ta3  1  0.0  0.04  0.36  1.0
  Hg  Hg1  1  0.04  0.04  0.0  1.0
  Cl  Cl0  1  0.0  0.0  0.0  1.0

data_Ta2HgCl
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.78
_cell_length_b   5.78
_cell_length_c   4.73
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ta2HgCl
_chemical_formula_sum   'Ta4 Hg2 Cl2'
_cell_volume   157.67
_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  4  0.02  0.02  0.36  1.0
  Hg  Hg1  2  0.04  0.0  0.0  1.0
  Cl  Cl2  2  0.0  0.0  0.0  1.0

Ta Ta Hg Cl
Ta Ta Hg Cl 0 1 o o o 2 3 o o o 
(Ta)2HgCl crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two mercury hydrochloride molecules and two tantalum molecules.