data_Ag(HgBr)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.62
_cell_length_b   7.62
_cell_length_c   7.62
_cell_angle_alpha   140.62
_cell_angle_beta   140.62
_cell_angle_gamma   56.91
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ag(HgBr)2
_chemical_formula_sum   'Ag1 Hg2 Br2'
_cell_volume   176.32
_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
  Ag  Ag0  1  0.0  0.0  0.0  1.0
  Hg  Hg3  1  0.0  0.57  0.35  1.0
  Hg  Hg4  1  0.57  0.0  0.35  1.0
  Br  Br1  1  0.0  0.0  0.43  1.0
  Br  Br2  1  0.0  0.0  0.96  1.0

data_Ag(HgBr)2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.26
_cell_length_b   7.26
_cell_length_c   7.62
_cell_angle_alpha   90.0
_cell_angle_beta   118.45
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ag(HgBr)2
_chemical_formula_sum   'Ag2 Hg4 Br4'
_cell_volume   352.64
_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
  Ag  Ag0  2  0.0  0.0  0.0  1.0
  Hg  Hg1  4  0.28  0.72  0.22  1.0
  Br  Br2  2  0.0  0.0  0.04  1.0
  Br  Br3  2  0.0  0.0  0.57  1.0

Ag Hg Hg Br Br
Ag Hg Hg Br Br 0 4 o o - 0 1 o - - 0 1 o o o 0 2 o o o 0 2 - o - 0 3 o o o 1 3 o + o 1 4 o + o 1 4 o o - 1 2 - + o 2 4 o o - 2 4 + o o 2 3 + o o 
Ag(HgBr)2 crystallizes in the monoclinic Cm space group. Ag(1) is bonded in a single-bond geometry to one Br(1) and one Br(2) atom. The Ag(1)-Br(1) bond length is 3.28 Å. The Ag(1)-Br(2) bond length is 0.30 Å. Hg(1) is bonded in a 3-coordinate geometry to one Br(1) and two equivalent Br(2) atoms. The Hg(1)-Br(1) bond length is 2.85 Å. There is one shorter (2.76 Å) and one longer (2.98 Å) Hg(1)-Br(2) bond length. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 3-coordinate geometry to one Ag(1) and two equivalent Hg(1) atoms. In the second Br site, Br(2) is bonded in a single-bond geometry to one Ag(1) and four equivalent Hg(1) atoms.