The structure described by CrN2 crystallizes in the orthorhombic I2_12_12_1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form corner-sharing CrN4 tetrahedra. In the second Cr site, Cr(2) is bonded to two equivalent N(1) and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. There are three inequivalent N sites. In the first N site, N(1) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom. In the second N site, N(2) is bonded in a bent 120 degrees geometry to two equivalent Cr(1) atoms. In the third N site, N(3) is bonded in a bent 120 degrees geometry to two equivalent Cr(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CrN2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.940
_cell_length_b   8.940
_cell_length_c   8.940
_cell_angle_alpha   151.574
_cell_angle_beta   149.144
_cell_angle_gamma   42.448
_symmetry_Int_Tables_number   1
_cell_volume   174.043
_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
  Cr  Cr0  1  0.939  0.689  0.250  1.0
  Cr  Cr1  1  0.561  0.811  0.750  1.0
  Cr  Cr2  1  0.689  0.439  0.250  1.0
  Cr  Cr3  1  0.811  0.061  0.750  1.0
  N  N4  1  0.799  0.128  0.178  1.0
  N  N5  1  0.450  0.621  0.322  1.0
  N  N6  1  0.050  0.372  0.171  1.0
  N  N7  1  0.701  0.879  0.329  1.0
  N  N8  1  0.250  0.923  0.673  1.0
  N  N9  1  0.750  0.577  0.827  1.0
  N  N10  1  0.943  0.750  0.693  1.0
  N  N11  1  0.557  0.250  0.807  1.0
[/CIF]
.
The structure described by CrN2 crystallizes in the orthorhombic I2_12_12_1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form corner-sharing CrN4 tetrahedra. In the second Cr site, Cr(2) is bonded to two equivalent N(1) and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. There are three inequivalent N sites. In the first N site, N(1) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom. In the second N site, N(2) is bonded in a bent 120 degrees geometry to two equivalent Cr(1) atoms. In the third N site, N(3) is bonded in a bent 120 degrees geometry to two equivalent Cr(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CrN2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.940
_cell_length_b   8.940
_cell_length_c   8.940
_cell_angle_alpha   151.574
_cell_angle_beta   149.144
_cell_angle_gamma   42.448
_symmetry_Int_Tables_number   1
_cell_volume   174.043
_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
  Cr  Cr0  1  0.939  0.689  0.250  1.0
  Cr  Cr1  1  0.561  0.811  0.750  1.0
  Cr  Cr2  1  0.689  0.439  0.250  1.0
  Cr  Cr3  1  0.811  0.061  0.750  1.0
  N  N4  1  0.799  0.128  0.178  1.0
  N  N5  1  0.450  0.621  0.322  1.0
  N  N6  1  0.050  0.372  0.171  1.0
  N  N7  1  0.701  0.879  0.329  1.0
  N  N8  1  0.250  0.923  0.673  1.0
  N  N9  1  0.750  0.577  0.827  1.0
  N  N10  1  0.943  0.750  0.693  1.0
  N  N11  1  0.557  0.250  0.807  1.0
[/CIF]
.