data_SiPbCl2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.49
_cell_length_b   5.49
_cell_length_c   5.49
_cell_angle_alpha   130.25
_cell_angle_beta   130.25
_cell_angle_gamma   73.01
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiPbCl2
_chemical_formula_sum   'Si1 Pb1 Cl2'
_cell_volume   94.15
_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
  Si  Si3  1  0.0  0.0  0.0  1.0
  Pb  Pb2  1  0.0  0.0  0.41  1.0
  Cl  Cl0  1  0.31  0.0  0.21  1.0
  Cl  Cl1  1  0.0  0.31  0.21  1.0

data_SiPbCl2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.53
_cell_length_b   6.53
_cell_length_c   5.49
_cell_angle_alpha   90.0
_cell_angle_beta   126.51
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SiPbCl2
_chemical_formula_sum   'Si2 Pb2 Cl4'
_cell_volume   188.3
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  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
  Si  Si0  2  0.0  0.0  0.0  1.0
  Pb  Pb1  2  0.0  0.0  0.41  1.0
  Cl  Cl2  4  0.35  0.35  0.9  1.0

Si Pb Cl Cl
Si Pb Cl Cl 0 3 o o o 0 2 o o o 0 1 o o o 1 3 o o o 1 2 o o o 
PbSiCl2 crystallizes in the monoclinic Cm space group. Pb(1) is bonded in a 6-coordinate geometry to two equivalent Si(1) and four equivalent Cl(1) atoms. There is one shorter (2.27 Å) and one longer (3.22 Å) Pb(1)-Si(1) bond length. There are two shorter (2.58 Å) and two longer (3.18 Å) Pb(1)-Cl(1) bond lengths. Si(1) is bonded in a water-like geometry to two equivalent Pb(1) and two equivalent Cl(1) atoms. Both Si(1)-Cl(1) bond lengths are 1.30 Å. Cl(1) is bonded in a single-bond geometry to two equivalent Pb(1) and one Si(1) atom.