data_NaBeHg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.73
_cell_length_b   4.73
_cell_length_c   3.51
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaBeHg2
_chemical_formula_sum   'Na1 Be1 Hg2'
_cell_volume   78.65
_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  0.37  0.37  0.0  1.0
  Be  Be0  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.0  0.37  0.76  1.0
  Hg  Hg2  1  0.37  0.0  0.76  1.0

data_NaBeHg2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.69
_cell_length_b   6.69
_cell_length_c   3.51
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NaBeHg2
_chemical_formula_sum   'Na2 Be2 Hg4'
_cell_volume   157.31
_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  0.37  0.0  -0.0  1.0
  Be  Be1  2  0.0  0.0  0.0  1.0
  Hg  Hg2  4  0.18  0.18  0.76  1.0

Na Be Hg Hg
Na Be Hg Hg 0 2 o o - 0 3 o o - 1 3 o o - 1 2 o o - 
NaBeHg2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two NaBeHg2 clusters. Na(1) is bonded in a 2-coordinate geometry to two equivalent Hg(1) atoms. Both Na(1)-Hg(1) bond lengths are 1.93 Å. Be(1) is bonded in a 2-coordinate geometry to two equivalent Hg(1) atoms. Both Be(1)-Hg(1) bond lengths are 1.93 Å. Hg(1) is bonded in a 2-coordinate geometry to one Na(1) and one Be(1) atom.