data_B2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.62
_cell_length_b   2.62
_cell_length_c   3.33
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   B2C
_chemical_formula_sum   'B2 C1'
_cell_volume   19.87
_cell_formula_units_Z   1
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  0.31  0.76  0.82  1.0
  B  B1  1  0.31  0.76  0.52  1.0
  C  C2  1  0.0  0.0  0.0  1.0

data_B2C
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.62
_cell_length_b   2.62
_cell_length_c   3.33
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   B2C
_chemical_formula_sum   'B2 C1'
_cell_volume   19.87
_cell_formula_units_Z   1
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  0.31  0.76  0.52  1.0
  B  B1  1  0.31  0.76  0.82  1.0
  C  C2  1  0.0  0.0  0.0  1.0

B B C
B B C 0 1 o o o 0 2 + + + 0 2 o + + 
B2C crystallizes in the triclinic P1 space group. There are two inequivalent B sites. In the first B site, B(1) is bonded to one B(2) and three equivalent C(1) atoms to form distorted corner-sharing BBC3 tetrahedra. The B(1)-B(2) bond length is 1.00 Å. There are a spread of B(1)-C(1) bond distances ranging from 1.40-1.83 Å. In the second B site, B(2) is bonded in a 2-coordinate geometry to one B(1) and one C(1) atom. The B(2)-C(1) bond length is 2.14 Å. C(1) is bonded in a 4-coordinate geometry to one B(2) and three equivalent B(1) atoms.