The crystal structure described by Sr3(CrN2)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent N(2) and four equivalent N(1) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent N(1) and four equivalent N(2) atoms. Cr(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form a mixture of corner and edge-sharing CrN4 tetrahedra. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 7-coordinate geometry to one Sr(2), four equivalent Sr(1), and two equivalent Cr(1) atoms. In the second N site, N(2) is bonded in a 2-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Cr(1) atoms. is represented by the CIF file [CIF]
data_Sr3(CrN2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.125
_cell_length_b   8.683
_cell_length_c   5.604
_cell_angle_alpha   90.000
_cell_angle_beta   93.444
_cell_angle_gamma   127.538
_symmetry_Int_Tables_number   1
_cell_volume   274.137
_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
  Sr  Sr0  1  0.246  0.993  0.052  1.0
  Sr  Sr1  1  0.754  0.747  0.448  1.0
  Sr  Sr2  1  0.754  0.007  0.948  1.0
  Sr  Sr3  1  0.246  0.253  0.552  1.0
  Sr  Sr4  1  0.000  0.602  0.750  1.0
  Sr  Sr5  1  0.000  0.398  0.250  1.0
  Cr  Cr6  1  0.584  0.166  0.578  1.0
  Cr  Cr7  1  0.416  0.582  0.922  1.0
  Cr  Cr8  1  0.416  0.834  0.422  1.0
  Cr  Cr9  1  0.584  0.418  0.078  1.0
  N  N10  1  0.259  0.945  0.524  1.0
  N  N11  1  0.741  0.686  0.976  1.0
  N  N12  1  0.741  0.055  0.476  1.0
  N  N13  1  0.259  0.314  0.024  1.0
  N  N14  1  0.643  0.275  0.887  1.0
  N  N15  1  0.357  0.632  0.613  1.0
  N  N16  1  0.357  0.725  0.113  1.0
  N  N17  1  0.643  0.368  0.387  1.0
[/CIF]
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The crystal structure described by Sr3(CrN2)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent N(2) and four equivalent N(1) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent N(1) and four equivalent N(2) atoms. Cr(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form a mixture of corner and edge-sharing CrN4 tetrahedra. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 7-coordinate geometry to one Sr(2), four equivalent Sr(1), and two equivalent Cr(1) atoms. In the second N site, N(2) is bonded in a 2-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Cr(1) atoms. is represented by the CIF file [CIF]
data_Sr3(CrN2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.125
_cell_length_b   8.683
_cell_length_c   5.604
_cell_angle_alpha   90.000
_cell_angle_beta   93.444
_cell_angle_gamma   127.538
_symmetry_Int_Tables_number   1
_cell_volume   274.137
_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
  Sr  Sr0  1  0.246  0.993  0.052  1.0
  Sr  Sr1  1  0.754  0.747  0.448  1.0
  Sr  Sr2  1  0.754  0.007  0.948  1.0
  Sr  Sr3  1  0.246  0.253  0.552  1.0
  Sr  Sr4  1  0.000  0.602  0.750  1.0
  Sr  Sr5  1  0.000  0.398  0.250  1.0
  Cr  Cr6  1  0.584  0.166  0.578  1.0
  Cr  Cr7  1  0.416  0.582  0.922  1.0
  Cr  Cr8  1  0.416  0.834  0.422  1.0
  Cr  Cr9  1  0.584  0.418  0.078  1.0
  N  N10  1  0.259  0.945  0.524  1.0
  N  N11  1  0.741  0.686  0.976  1.0
  N  N12  1  0.741  0.055  0.476  1.0
  N  N13  1  0.259  0.314  0.024  1.0
  N  N14  1  0.643  0.275  0.887  1.0
  N  N15  1  0.357  0.632  0.613  1.0
  N  N16  1  0.357  0.725  0.113  1.0
  N  N17  1  0.643  0.368  0.387  1.0
[/CIF]
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