data_BeCd2Hg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.26
_cell_length_b   5.26
_cell_length_c   5.26
_cell_angle_alpha   132.45
_cell_angle_beta   132.45
_cell_angle_gamma   69.51
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BeCd2Hg
_chemical_formula_sum   'Be1 Cd2 Hg1'
_cell_volume   77.93
_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
  Be  Be0  1  0.0  0.0  0.0  1.0
  Cd  Cd1  1  0.12  0.0  0.16  1.0
  Cd  Cd2  1  0.0  0.12  0.16  1.0
  Hg  Hg3  1  0.0  0.0  0.33  1.0

data_BeCd2Hg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.0
_cell_length_b   6.0
_cell_length_c   5.26
_cell_angle_alpha   90.0
_cell_angle_beta   124.76
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   BeCd2Hg
_chemical_formula_sum   'Be2 Cd4 Hg2'
_cell_volume   155.87
_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
  Be  Be0  2  0.0  0.0  0.0  1.0
  Cd  Cd1  4  0.4  0.44  0.96  1.0
  Hg  Hg2  2  0.17  0.5  0.67  1.0

Be Cd Cd Hg
BeHgCd2 is Indium-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two BeHgCd2 clusters. Be(1) is bonded in a 2-coordinate geometry to two equivalent Cd(1) atoms. Both Be(1)-Cd(1) bond lengths are 0.64 Å. Hg(1) is bonded in a 2-coordinate geometry to two equivalent Cd(1) atoms. Both Hg(1)-Cd(1) bond lengths are 1.38 Å. Cd(1) is bonded in a 3-coordinate geometry to one Be(1), one Hg(1), and one Cd(1) atom. The Cd(1)-Cd(1) bond length is 0.73 Å.