data_NaHg2Cl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.1
_cell_length_b   7.1
_cell_length_c   7.1
_cell_angle_alpha   145.73
_cell_angle_beta   145.73
_cell_angle_gamma   49.25
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaHg2Cl
_chemical_formula_sum   'Na1 Hg2 Cl1'
_cell_volume   112.78
_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
  Na  Na3  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.0  0.09  0.23  1.0
  Hg  Hg2  1  0.09  0.0  0.23  1.0
  Cl  Cl0  1  0.0  0.0  0.45  1.0

data_NaHg2Cl
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.91
_cell_length_b   5.91
_cell_length_c   7.1
_cell_angle_alpha   90.0
_cell_angle_beta   114.63
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NaHg2Cl
_chemical_formula_sum   'Na2 Hg4 Cl2'
_cell_volume   225.56
_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
  Na  Na0  2  0.0  0.0  0.0  1.0
  Hg  Hg1  4  0.18  0.05  0.13  1.0
  Cl  Cl2  2  0.45  0.0  0.45  1.0

Na Hg Hg Cl
NaHg2Cl crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two NaHg2Cl clusters. Na(1) is bonded in a 2-coordinate geometry to two equivalent Hg(1) atoms. Both Na(1)-Hg(1) bond lengths are 1.13 Å. Hg(1) is bonded in a 3-coordinate geometry to one Na(1), one Hg(1), and one Cl(1) atom. The Hg(1)-Hg(1) bond length is 0.54 Å. The Hg(1)-Cl(1) bond length is 2.16 Å. Cl(1) is bonded in a 2-coordinate geometry to two equivalent Hg(1) atoms.