The compound described by Pr2SiS5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to one S(5), two equivalent S(1), two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one S(1), one S(3), two equivalent S(2), two equivalent S(4), and two equivalent S(5) atoms. Si(1) is bonded in a tetrahedral geometry to one S(1), one S(2), one S(3), and one S(5) atom. There are five inequivalent S sites. In the first S site, S(1) is bonded in a distorted rectangular see-saw-like geometry to one Pr(2), two equivalent Pr(1), and one Si(1) atom. In the second S site, S(2) is bonded to two equivalent Pr(1), two equivalent Pr(2), and one Si(1) atom to form distorted SPr4Si trigonal bipyramids that share corners with five equivalent S(5)Pr3Si tetrahedra, corners with three equivalent S(4)Pr4 trigonal pyramids,  an edgeedge with one S(5)Pr3Si tetrahedra, edges with two equivalent S(2)Pr4Si trigonal bipyramids,  an edgeedge with one S(4)Pr4 trigonal pyramid, and  a faceface with one S(4)Pr4 trigonal pyramid. In the third S site, S(3) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), and one Si(1) atom. In the fourth S site, S(4) is bonded to two equivalent Pr(1) and two equivalent Pr(2) atoms to form SPr4 trigonal pyramids that share corners with four equivalent S(5)Pr3Si tetrahedra, corners with three equivalent S(2)Pr4Si trigonal bipyramids, corners with two equivalent S(4)Pr4 trigonal pyramids,  an edgeedge with one S(5)Pr3Si tetrahedra,  an edgeedge with one S(2)Pr4Si trigonal bipyramid,  an edgeedge with one S(4)Pr4 trigonal pyramid, and  a faceface with one S(2)Pr4Si trigonal bipyramid. In the fifth S site, S(5) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form distorted SPr3Si tetrahedra that share corners with five equivalent S(2)Pr4Si trigonal bipyramids, corners with four equivalent S(4)Pr4 trigonal pyramids,  an edgeedge with one S(5)Pr3Si tetrahedra,  an edgeedge with one S(2)Pr4Si trigonal bipyramid, and  an edgeedge with one S(4)Pr4 trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pr2SiS5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.581
_cell_length_b   7.599
_cell_length_c   7.855
_cell_angle_alpha   78.627
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   736.239
_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
  Pr  Pr0  1  0.835  0.838  0.632  1.0
  Pr  Pr1  1  0.165  0.162  0.368  1.0
  Pr  Pr2  1  0.335  0.162  0.868  1.0
  Pr  Pr3  1  0.665  0.838  0.132  1.0
  Pr  Pr4  1  0.405  0.760  0.543  1.0
  Pr  Pr5  1  0.595  0.240  0.457  1.0
  Pr  Pr6  1  0.905  0.240  0.957  1.0
  Pr  Pr7  1  0.095  0.760  0.043  1.0
  Si  Si8  1  0.116  0.668  0.595  1.0
  Si  Si9  1  0.884  0.332  0.405  1.0
  Si  Si10  1  0.616  0.332  0.905  1.0
  Si  Si11  1  0.384  0.668  0.095  1.0
  S  S12  1  0.470  0.825  0.886  1.0
  S  S13  1  0.530  0.175  0.114  1.0
  S  S14  1  0.970  0.175  0.614  1.0
  S  S15  1  0.030  0.825  0.386  1.0
  S  S16  1  0.203  0.870  0.694  1.0
  S  S17  1  0.797  0.130  0.306  1.0
  S  S18  1  0.703  0.130  0.806  1.0
  S  S19  1  0.297  0.870  0.194  1.0
  S  S20  1  0.227  0.475  0.550  1.0
  S  S21  1  0.773  0.525  0.450  1.0
  S  S22  1  0.727  0.525  0.950  1.0
  S  S23  1  0.273  0.475  0.050  1.0
  S  S24  1  0.879  0.863  0.997  1.0
  S  S25  1  0.121  0.137  0.003  1.0
  S  S26  1  0.379  0.137  0.503  1.0
  S  S27  1  0.621  0.863  0.497  1.0
  S  S28  1  0.498  0.421  0.720  1.0
  S  S29  1  0.502  0.579  0.280  1.0
  S  S30  1  0.998  0.579  0.780  1.0
  S  S31  1  0.002  0.421  0.220  1.0
[/CIF]
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The compound described by Pr2SiS5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to one S(5), two equivalent S(1), two equivalent S(2), two equivalent S(3), and two equivalent S(4) atoms. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one S(1), one S(3), two equivalent S(2), two equivalent S(4), and two equivalent S(5) atoms. Si(1) is bonded in a tetrahedral geometry to one S(1), one S(2), one S(3), and one S(5) atom. There are five inequivalent S sites. In the first S site, S(1) is bonded in a distorted rectangular see-saw-like geometry to one Pr(2), two equivalent Pr(1), and one Si(1) atom. In the second S site, S(2) is bonded to two equivalent Pr(1), two equivalent Pr(2), and one Si(1) atom to form distorted SPr4Si trigonal bipyramids that share corners with five equivalent S(5)Pr3Si tetrahedra, corners with three equivalent S(4)Pr4 trigonal pyramids,  an edgeedge with one S(5)Pr3Si tetrahedra, edges with two equivalent S(2)Pr4Si trigonal bipyramids,  an edgeedge with one S(4)Pr4 trigonal pyramid, and  a faceface with one S(4)Pr4 trigonal pyramid. In the third S site, S(3) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), and one Si(1) atom. In the fourth S site, S(4) is bonded to two equivalent Pr(1) and two equivalent Pr(2) atoms to form SPr4 trigonal pyramids that share corners with four equivalent S(5)Pr3Si tetrahedra, corners with three equivalent S(2)Pr4Si trigonal bipyramids, corners with two equivalent S(4)Pr4 trigonal pyramids,  an edgeedge with one S(5)Pr3Si tetrahedra,  an edgeedge with one S(2)Pr4Si trigonal bipyramid,  an edgeedge with one S(4)Pr4 trigonal pyramid, and  a faceface with one S(2)Pr4Si trigonal bipyramid. In the fifth S site, S(5) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form distorted SPr3Si tetrahedra that share corners with five equivalent S(2)Pr4Si trigonal bipyramids, corners with four equivalent S(4)Pr4 trigonal pyramids,  an edgeedge with one S(5)Pr3Si tetrahedra,  an edgeedge with one S(2)Pr4Si trigonal bipyramid, and  an edgeedge with one S(4)Pr4 trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pr2SiS5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.581
_cell_length_b   7.599
_cell_length_c   7.855
_cell_angle_alpha   78.627
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   736.239
_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
  Pr  Pr0  1  0.835  0.838  0.632  1.0
  Pr  Pr1  1  0.165  0.162  0.368  1.0
  Pr  Pr2  1  0.335  0.162  0.868  1.0
  Pr  Pr3  1  0.665  0.838  0.132  1.0
  Pr  Pr4  1  0.405  0.760  0.543  1.0
  Pr  Pr5  1  0.595  0.240  0.457  1.0
  Pr  Pr6  1  0.905  0.240  0.957  1.0
  Pr  Pr7  1  0.095  0.760  0.043  1.0
  Si  Si8  1  0.116  0.668  0.595  1.0
  Si  Si9  1  0.884  0.332  0.405  1.0
  Si  Si10  1  0.616  0.332  0.905  1.0
  Si  Si11  1  0.384  0.668  0.095  1.0
  S  S12  1  0.470  0.825  0.886  1.0
  S  S13  1  0.530  0.175  0.114  1.0
  S  S14  1  0.970  0.175  0.614  1.0
  S  S15  1  0.030  0.825  0.386  1.0
  S  S16  1  0.203  0.870  0.694  1.0
  S  S17  1  0.797  0.130  0.306  1.0
  S  S18  1  0.703  0.130  0.806  1.0
  S  S19  1  0.297  0.870  0.194  1.0
  S  S20  1  0.227  0.475  0.550  1.0
  S  S21  1  0.773  0.525  0.450  1.0
  S  S22  1  0.727  0.525  0.950  1.0
  S  S23  1  0.273  0.475  0.050  1.0
  S  S24  1  0.879  0.863  0.997  1.0
  S  S25  1  0.121  0.137  0.003  1.0
  S  S26  1  0.379  0.137  0.503  1.0
  S  S27  1  0.621  0.863  0.497  1.0
  S  S28  1  0.498  0.421  0.720  1.0
  S  S29  1  0.502  0.579  0.280  1.0
  S  S30  1  0.998  0.579  0.780  1.0
  S  S31  1  0.002  0.421  0.220  1.0
[/CIF]
.