data_HgGe2Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.69
_cell_length_b   5.69
_cell_length_c   5.69
_cell_angle_alpha   132.96
_cell_angle_beta   132.96
_cell_angle_gamma   68.71
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HgGe2Pb
_chemical_formula_sum   'Hg1 Ge2 Pb1'
_cell_volume   97.01
_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
  Hg  Hg2  1  0.0  0.0  0.0  1.0
  Ge  Ge0  1  0.0  0.27  0.35  1.0
  Ge  Ge1  1  0.27  0.0  0.35  1.0
  Pb  Pb3  1  0.0  0.0  0.7  1.0

data_HgGe2Pb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.43
_cell_length_b   6.43
_cell_length_c   5.69
_cell_angle_alpha   90.0
_cell_angle_beta   124.36
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   HgGe2Pb
_chemical_formula_sum   'Hg2 Ge4 Pb2'
_cell_volume   194.01
_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
  Hg  Hg0  2  0.0  0.0  0.0  1.0
  Ge  Ge1  4  0.29  0.36  0.92  1.0
  Pb  Pb2  2  0.3  0.0  0.3  1.0

Hg Ge Ge Pb
Hg Ge Ge Pb 0 1 o o o 0 3 o o - 0 2 o o o 1 2 o o o 
HgPbGe2 is Indium-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two HgPbGe2 clusters. Hg(1) is bonded in a 3-coordinate geometry to one Pb(1) and two equivalent Ge(1) atoms. The Hg(1)-Pb(1) bond length is 1.71 Å. Both Hg(1)-Ge(1) bond lengths are 1.47 Å. Pb(1) is bonded in a single-bond geometry to one Hg(1) atom. Ge(1) is bonded in a 1-coordinate geometry to one Hg(1) atom.