The structure described by SiPb2S4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 6-coordinate geometry to one S(1), one S(3), two equivalent S(2), and two equivalent S(4) atoms. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one S(1), one S(3), and one S(4) atom. Si(1) is bonded in a tetrahedral geometry to one S(1), one S(2), one S(3), and one S(4) atom. There are four inequivalent S sites. In the first S site, S(1) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), and one Si(1) atom. In the second S site, S(2) is bonded in a distorted single-bond geometry to two equivalent Pb(1) and one Si(1) atom. In the third S site, S(3) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), and one Si(1) atom. In the fourth S site, S(4) is bonded in a distorted single-bond geometry to one Pb(2), two equivalent Pb(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Si(PbS2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.833
_cell_length_b   6.637
_cell_length_c   16.845
_cell_angle_alpha   71.493
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   724.406
_cell_formula_units_Z   4
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  Si0  1  0.757  0.211  0.102  1.0
  Si  Si1  1  0.243  0.789  0.898  1.0
  Si  Si2  1  0.257  0.789  0.398  1.0
  Si  Si3  1  0.743  0.211  0.602  1.0
  Pb  Pb4  1  0.706  0.758  0.021  1.0
  Pb  Pb5  1  0.794  0.758  0.521  1.0
  Pb  Pb6  1  0.328  0.264  0.710  1.0
  Pb  Pb7  1  0.672  0.736  0.290  1.0
  Pb  Pb8  1  0.172  0.264  0.210  1.0
  Pb  Pb9  1  0.294  0.242  0.979  1.0
  Pb  Pb10  1  0.828  0.736  0.790  1.0
  Pb  Pb11  1  0.206  0.242  0.479  1.0
  S  S12  1  0.508  0.984  0.376  1.0
  S  S13  1  0.278  0.619  0.028  1.0
  S  S14  1  0.716  0.421  0.675  1.0
  S  S15  1  0.490  0.993  0.861  1.0
  S  S16  1  0.784  0.421  0.175  1.0
  S  S17  1  0.722  0.381  0.972  1.0
  S  S18  1  0.990  0.007  0.639  1.0
  S  S19  1  0.492  0.016  0.624  1.0
  S  S20  1  0.222  0.619  0.528  1.0
  S  S21  1  0.010  0.993  0.361  1.0
  S  S22  1  0.008  0.016  0.124  1.0
  S  S23  1  0.216  0.579  0.825  1.0
  S  S24  1  0.992  0.984  0.876  1.0
  S  S25  1  0.778  0.381  0.472  1.0
  S  S26  1  0.284  0.579  0.325  1.0
  S  S27  1  0.510  0.007  0.139  1.0
[/CIF]
.
The structure described by SiPb2S4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 6-coordinate geometry to one S(1), one S(3), two equivalent S(2), and two equivalent S(4) atoms. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one S(1), one S(3), and one S(4) atom. Si(1) is bonded in a tetrahedral geometry to one S(1), one S(2), one S(3), and one S(4) atom. There are four inequivalent S sites. In the first S site, S(1) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), and one Si(1) atom. In the second S site, S(2) is bonded in a distorted single-bond geometry to two equivalent Pb(1) and one Si(1) atom. In the third S site, S(3) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), and one Si(1) atom. In the fourth S site, S(4) is bonded in a distorted single-bond geometry to one Pb(2), two equivalent Pb(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Si(PbS2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.833
_cell_length_b   6.637
_cell_length_c   16.845
_cell_angle_alpha   71.493
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   724.406
_cell_formula_units_Z   4
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  Si0  1  0.757  0.211  0.102  1.0
  Si  Si1  1  0.243  0.789  0.898  1.0
  Si  Si2  1  0.257  0.789  0.398  1.0
  Si  Si3  1  0.743  0.211  0.602  1.0
  Pb  Pb4  1  0.706  0.758  0.021  1.0
  Pb  Pb5  1  0.794  0.758  0.521  1.0
  Pb  Pb6  1  0.328  0.264  0.710  1.0
  Pb  Pb7  1  0.672  0.736  0.290  1.0
  Pb  Pb8  1  0.172  0.264  0.210  1.0
  Pb  Pb9  1  0.294  0.242  0.979  1.0
  Pb  Pb10  1  0.828  0.736  0.790  1.0
  Pb  Pb11  1  0.206  0.242  0.479  1.0
  S  S12  1  0.508  0.984  0.376  1.0
  S  S13  1  0.278  0.619  0.028  1.0
  S  S14  1  0.716  0.421  0.675  1.0
  S  S15  1  0.490  0.993  0.861  1.0
  S  S16  1  0.784  0.421  0.175  1.0
  S  S17  1  0.722  0.381  0.972  1.0
  S  S18  1  0.990  0.007  0.639  1.0
  S  S19  1  0.492  0.016  0.624  1.0
  S  S20  1  0.222  0.619  0.528  1.0
  S  S21  1  0.010  0.993  0.361  1.0
  S  S22  1  0.008  0.016  0.124  1.0
  S  S23  1  0.216  0.579  0.825  1.0
  S  S24  1  0.992  0.984  0.876  1.0
  S  S25  1  0.778  0.381  0.472  1.0
  S  S26  1  0.284  0.579  0.325  1.0
  S  S27  1  0.510  0.007  0.139  1.0
[/CIF]
.