data_YPbCl2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.62
_cell_length_b   5.62
_cell_length_c   5.62
_cell_angle_alpha   128.72
_cell_angle_beta   128.72
_cell_angle_gamma   75.45
_symmetry_Int_Tables_number   1
_chemical_formula_structural   YPbCl2
_chemical_formula_sum   'Y1 Pb1 Cl2'
_cell_volume   105.24
_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
  Y  Y3  1  0.0  0.0  0.0  1.0
  Pb  Pb2  1  0.0  0.0  0.45  1.0
  Cl  Cl0  1  0.43  0.0  0.22  1.0
  Cl  Cl1  1  0.0  0.43  0.22  1.0

data_YPbCl2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.88
_cell_length_b   6.88
_cell_length_c   5.62
_cell_angle_alpha   90.0
_cell_angle_beta   127.73
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   YPbCl2
_chemical_formula_sum   'Y2 Pb2 Cl4'
_cell_volume   210.47
_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
  Y  Y0  2  0.0  0.0  0.0  1.0
  Pb  Pb1  2  0.0  0.0  0.45  1.0
  Cl  Cl2  4  0.28  0.28  0.79  1.0

Y Pb Cl Cl
YPbCl2 crystallizes in the monoclinic Cm space group. Y(1) is bonded in a 2-coordinate geometry to two equivalent Pb(1) and two equivalent Cl(1) atoms. There is one shorter (2.51 Å) and one longer (3.11 Å) Y(1)-Pb(1) bond length. Both Y(1)-Cl(1) bond lengths are 1.92 Å. Pb(1) is bonded to two equivalent Y(1) and two equivalent Cl(1) atoms to form distorted corner-sharing PbY2Cl2 tetrahedra. Both Pb(1)-Cl(1) bond lengths are 2.60 Å. Cl(1) is bonded in a distorted single-bond geometry to one Y(1) and one Pb(1) atom.