data_BeHg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.23
_cell_length_b   3.9
_cell_length_c   5.1
_cell_angle_alpha   90.0
_cell_angle_beta   92.99
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BeHg
_chemical_formula_sum   'Be2 Hg2'
_cell_volume   64.15
_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
  Be  Be0  1  0.54  0.92  0.21  1.0
  Be  Be1  1  0.42  0.97  0.89  1.0
  Hg  Hg2  1  0.93  0.92  0.09  1.0
  Hg  Hg3  1  0.03  0.97  0.01  1.0

data_BeHg
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.23
_cell_length_b   3.9
_cell_length_c   5.1
_cell_angle_alpha   90.0
_cell_angle_beta   92.99
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   BeHg
_chemical_formula_sum   'Be2 Hg2'
_cell_volume   64.15
_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
  Be  Be0  2  0.06  0.47  0.16  1.0
  Hg  Hg1  2  0.45  0.47  0.04  1.0

Be Be Hg Hg
Be Be Hg Hg 0 1 o o - 0 2 o o o 1 3 o o + 2 3 + o o 
BeHg is Indium-like structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one BeHg cluster. Be(1) is bonded in a distorted single-bond geometry to one Hg(1) atom. The Be(1)-Hg(1) bond length is 1.43 Å. Hg(1) is bonded in a distorted bent 150 degrees geometry to one Be(1) and one Hg(1) atom. The Hg(1)-Hg(1) bond length is 0.58 Å.