The crystal structure described by BC2N crystallizes in the monoclinic Cm space group. There are two inequivalent B sites. In the first B site, B(1) is bonded in a distorted trigonal non-coplanar geometry to one B(2), one C(1), and two equivalent N(1) atoms. In the second B site, B(2) is bonded to one B(1), one C(3), and two equivalent C(2) atoms to form distorted BBC3 tetrahedra that share corners with four equivalent C(1)BC3 tetrahedra and corners with eight equivalent N(1)BC3 tetrahedra. There are three inequivalent C sites. In the first C site, C(1) is bonded to one B(1), one C(3), and two equivalent C(2) atoms to form distorted CBC3 tetrahedra that share corners with four equivalent B(2)BC3 tetrahedra and corners with eight equivalent N(1)BC3 tetrahedra. In the second C site, C(2) is bonded to one B(2), one C(1), and two equivalent N(1) atoms to form distorted corner-sharing CBCN2 tetrahedra. In the third C site, C(3) is bonded to one B(2), one C(1), and two equivalent N(1) atoms to form distorted corner-sharing CBCN2 tetrahedra. N(1) is bonded to one B(1), one C(3), and two equivalent C(2) atoms to form NBC3 tetrahedra that share corners with four equivalent B(2)BC3 tetrahedra, corners with four equivalent C(1)BC3 tetrahedra, and corners with four equivalent N(1)BC3 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_BC2N
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.638
_cell_length_b   3.638
_cell_length_c   3.637
_cell_angle_alpha   89.796
_cell_angle_beta   89.796
_cell_angle_gamma   89.503
_symmetry_Int_Tables_number   1
_cell_volume   48.132
_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
  B  B0  1  0.253  0.253  0.751  1.0
  B  B1  1  0.997  0.997  0.496  1.0
  C  C2  1  0.502  0.502  0.495  1.0
  C  C3  1  0.255  0.750  0.254  1.0
  C  C4  1  0.750  0.255  0.254  1.0
  C  C5  1  0.748  0.748  0.750  1.0
  N  N6  1  0.994  0.501  0.000  1.0
  N  N7  1  0.501  0.994  0.000  1.0
[/CIF]
.
The crystal structure described by BC2N crystallizes in the monoclinic Cm space group. There are two inequivalent B sites. In the first B site, B(1) is bonded in a distorted trigonal non-coplanar geometry to one B(2), one C(1), and two equivalent N(1) atoms. In the second B site, B(2) is bonded to one B(1), one C(3), and two equivalent C(2) atoms to form distorted BBC3 tetrahedra that share corners with four equivalent C(1)BC3 tetrahedra and corners with eight equivalent N(1)BC3 tetrahedra. There are three inequivalent C sites. In the first C site, C(1) is bonded to one B(1), one C(3), and two equivalent C(2) atoms to form distorted CBC3 tetrahedra that share corners with four equivalent B(2)BC3 tetrahedra and corners with eight equivalent N(1)BC3 tetrahedra. In the second C site, C(2) is bonded to one B(2), one C(1), and two equivalent N(1) atoms to form distorted corner-sharing CBCN2 tetrahedra. In the third C site, C(3) is bonded to one B(2), one C(1), and two equivalent N(1) atoms to form distorted corner-sharing CBCN2 tetrahedra. N(1) is bonded to one B(1), one C(3), and two equivalent C(2) atoms to form NBC3 tetrahedra that share corners with four equivalent B(2)BC3 tetrahedra, corners with four equivalent C(1)BC3 tetrahedra, and corners with four equivalent N(1)BC3 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_BC2N
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.638
_cell_length_b   3.638
_cell_length_c   3.637
_cell_angle_alpha   89.796
_cell_angle_beta   89.796
_cell_angle_gamma   89.503
_symmetry_Int_Tables_number   1
_cell_volume   48.132
_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
  B  B0  1  0.253  0.253  0.751  1.0
  B  B1  1  0.997  0.997  0.496  1.0
  C  C2  1  0.502  0.502  0.495  1.0
  C  C3  1  0.255  0.750  0.254  1.0
  C  C4  1  0.750  0.255  0.254  1.0
  C  C5  1  0.748  0.748  0.750  1.0
  N  N6  1  0.994  0.501  0.000  1.0
  N  N7  1  0.501  0.994  0.000  1.0
[/CIF]
.