The crystal structure described by Pr2SiC(NO2)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to two equivalent N(1), two equivalent N(2), one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one N(1), one N(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. C(1) is bonded in a linear geometry to one N(1) and one N(2) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one C(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one C(1) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OPr3Si tetrahedra. In the second O site, O(2) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OPr3Si trigonal pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Pr2SiC(NO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.521
_cell_length_b   6.736
_cell_length_c   6.767
_cell_angle_alpha   85.136
_cell_angle_beta   72.924
_cell_angle_gamma   74.738
_symmetry_Int_Tables_number   1
_cell_volume   274.123
_cell_formula_units_Z   2
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  0.541  0.697  0.202  1.0
  Pr  Pr1  1  0.459  0.303  0.798  1.0
  Pr  Pr2  1  0.943  0.756  0.668  1.0
  Pr  Pr3  1  0.057  0.244  0.332  1.0
  Si  Si4  1  0.038  0.713  0.184  1.0
  Si  Si5  1  0.962  0.287  0.816  1.0
  C  C6  1  0.439  0.809  0.706  1.0
  C  C7  1  0.561  0.191  0.294  1.0
  N  N8  1  0.526  0.907  0.790  1.0
  N  N9  1  0.474  0.093  0.210  1.0
  N  N10  1  0.361  0.704  0.621  1.0
  N  N11  1  0.639  0.296  0.379  1.0
  O  O12  1  0.885  0.128  0.695  1.0
  O  O13  1  0.115  0.872  0.305  1.0
  O  O14  1  0.142  0.383  0.630  1.0
  O  O15  1  0.858  0.617  0.370  1.0
  O  O16  1  0.902  0.794  0.017  1.0
  O  O17  1  0.098  0.206  0.983  1.0
  O  O18  1  0.733  0.471  0.896  1.0
  O  O19  1  0.267  0.529  0.104  1.0
[/CIF]
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The crystal structure described by Pr2SiC(NO2)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to two equivalent N(1), two equivalent N(2), one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one N(1), one N(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. C(1) is bonded in a linear geometry to one N(1) and one N(2) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one C(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one C(1) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OPr3Si tetrahedra. In the second O site, O(2) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OPr3Si trigonal pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Pr2SiC(NO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.521
_cell_length_b   6.736
_cell_length_c   6.767
_cell_angle_alpha   85.136
_cell_angle_beta   72.924
_cell_angle_gamma   74.738
_symmetry_Int_Tables_number   1
_cell_volume   274.123
_cell_formula_units_Z   2
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  0.541  0.697  0.202  1.0
  Pr  Pr1  1  0.459  0.303  0.798  1.0
  Pr  Pr2  1  0.943  0.756  0.668  1.0
  Pr  Pr3  1  0.057  0.244  0.332  1.0
  Si  Si4  1  0.038  0.713  0.184  1.0
  Si  Si5  1  0.962  0.287  0.816  1.0
  C  C6  1  0.439  0.809  0.706  1.0
  C  C7  1  0.561  0.191  0.294  1.0
  N  N8  1  0.526  0.907  0.790  1.0
  N  N9  1  0.474  0.093  0.210  1.0
  N  N10  1  0.361  0.704  0.621  1.0
  N  N11  1  0.639  0.296  0.379  1.0
  O  O12  1  0.885  0.128  0.695  1.0
  O  O13  1  0.115  0.872  0.305  1.0
  O  O14  1  0.142  0.383  0.630  1.0
  O  O15  1  0.858  0.617  0.370  1.0
  O  O16  1  0.902  0.794  0.017  1.0
  O  O17  1  0.098  0.206  0.983  1.0
  O  O18  1  0.733  0.471  0.896  1.0
  O  O19  1  0.267  0.529  0.104  1.0
[/CIF]
.