data_SrHg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.91
_cell_length_b   5.91
_cell_length_c   5.83
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   58.94
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrHg2
_chemical_formula_sum   'Sr2 Hg4'
_cell_volume   174.3
_cell_formula_units_Z   2
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
  Sr  Sr4  1  0.14  0.51  0.46  1.0
  Sr  Sr5  1  0.14  0.49  0.37  1.0
  Hg  Hg0  1  0.38  0.39  0.46  1.0
  Hg  Hg1  1  0.91  0.61  0.37  1.0
  Hg  Hg2  1  0.91  0.39  0.46  1.0
  Hg  Hg3  1  0.38  0.61  0.37  1.0

data_SrHg2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   5.81
_cell_length_b   5.83
_cell_length_c   5.91
_cell_angle_alpha   90.0
_cell_angle_beta   119.47
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SrHg2
_chemical_formula_sum   'Sr2 Hg4'
_cell_volume   174.3
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  Sr  Sr0  2  0.49  0.96  0.49  1.0
  Hg  Hg1  2  0.39  0.04  0.16  1.0
  Hg  Hg2  2  0.39  0.04  0.63  1.0

Sr Sr Hg Hg Hg Hg
Sr Sr Hg Hg Hg Hg 0 1 o o o 0 2 o o o 0 3 - o o 1 2 o o o 1 3 - o o 2 5 o o o 3 4 o o o 
SrHg2 is Hg_xSn structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one SrHg2 cluster. Sr(1) is bonded in a distorted single-bond geometry to one Sr(1), two equivalent Hg(1), and two equivalent Hg(2) atoms. The Sr(1)-Sr(1) bond length is 0.53 Å. There is one shorter (1.18 Å) and one longer (1.29 Å) Sr(1)-Hg(1) bond length. There is one shorter (1.79 Å) and one longer (1.85 Å) Sr(1)-Hg(2) bond length. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Hg(2) atom. The Hg(1)-Hg(2) bond length is 1.35 Å. In the second Hg site, Hg(2) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Hg(1) atom.