The material structure described by BC5 crystallizes in the triclinic P-1 space group. B(1) is bonded to one C(1), one C(2), one C(3), and one C(4) atom to form BC4 tetrahedra that share corners with two equivalent C(1)BC3 tetrahedra, corners with two equivalent C(2)BC3 tetrahedra, corners with two equivalent C(4)BC3 tetrahedra, corners with three equivalent C(3)BC3 tetrahedra, and corners with three equivalent C(5)C4 tetrahedra. There are five inequivalent C sites. In the first C site, C(1) is bonded to one B(1), one C(2), one C(3), and one C(5) atom to form distorted CBC3 tetrahedra that share corners with two equivalent B(1)C4 tetrahedra, corners with two equivalent C(3)BC3 tetrahedra, corners with two equivalent C(5)C4 tetrahedra, corners with three equivalent C(2)BC3 tetrahedra, and corners with three equivalent C(4)BC3 tetrahedra. In the second C site, C(2) is bonded to one B(1), one C(1), one C(3), and one C(5) atom to form distorted CBC3 tetrahedra that share corners with two equivalent B(1)C4 tetrahedra, corners with two equivalent C(3)BC3 tetrahedra, corners with two equivalent C(5)C4 tetrahedra, corners with three equivalent C(1)BC3 tetrahedra, and corners with three equivalent C(4)BC3 tetrahedra. In the third C site, C(3) is bonded to one B(1), one C(1), one C(2), and one C(4) atom to form CBC3 tetrahedra that share corners with two equivalent C(1)BC3 tetrahedra, corners with two equivalent C(2)BC3 tetrahedra, corners with two equivalent C(4)BC3 tetrahedra, corners with three equivalent B(1)C4 tetrahedra, and corners with three equivalent C(5)C4 tetrahedra. In the fourth C site, C(4) is bonded to one B(1), one C(3), one C(4), and one C(5) atom to form distorted CBC3 tetrahedra that share corners with two equivalent B(1)C4 tetrahedra, corners with two equivalent C(3)BC3 tetrahedra, corners with two equivalent C(5)C4 tetrahedra, corners with three equivalent C(1)BC3 tetrahedra, and corners with three equivalent C(2)BC3 tetrahedra. In the fifth C site, C(5) is bonded to one C(1), one C(2), one C(4), and one C(5) atom to form CC4 tetrahedra that share corners with two equivalent C(1)BC3 tetrahedra, corners with two equivalent C(2)BC3 tetrahedra, corners with two equivalent C(4)BC3 tetrahedra, corners with three equivalent B(1)C4 tetrahedra, and corners with three equivalent C(3)BC3 tetrahedra. is represented by the CIF file [CIF]
data_BC5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.451
_cell_length_b   4.458
_cell_length_c   4.462
_cell_angle_alpha   119.899
_cell_angle_beta   99.084
_cell_angle_gamma   100.191
_symmetry_Int_Tables_number   1
_cell_volume   72.330
_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  0.191  0.395  0.733  1.0
  B  B1  1  0.809  0.605  0.267  1.0
  C  C2  1  0.686  0.217  0.886  1.0
  C  C3  1  0.314  0.783  0.114  1.0
  C  C4  1  0.316  0.096  0.771  1.0
  C  C5  1  0.684  0.904  0.229  1.0
  C  C6  1  0.799  0.268  0.600  1.0
  C  C7  1  0.201  0.732  0.400  1.0
  C  C8  1  0.684  0.560  0.576  1.0
  C  C9  1  0.316  0.440  0.424  1.0
  C  C10  1  0.188  0.064  0.063  1.0
  C  C11  1  0.812  0.936  0.937  1.0
[/CIF]
.
The material structure described by BC5 crystallizes in the triclinic P-1 space group. B(1) is bonded to one C(1), one C(2), one C(3), and one C(4) atom to form BC4 tetrahedra that share corners with two equivalent C(1)BC3 tetrahedra, corners with two equivalent C(2)BC3 tetrahedra, corners with two equivalent C(4)BC3 tetrahedra, corners with three equivalent C(3)BC3 tetrahedra, and corners with three equivalent C(5)C4 tetrahedra. There are five inequivalent C sites. In the first C site, C(1) is bonded to one B(1), one C(2), one C(3), and one C(5) atom to form distorted CBC3 tetrahedra that share corners with two equivalent B(1)C4 tetrahedra, corners with two equivalent C(3)BC3 tetrahedra, corners with two equivalent C(5)C4 tetrahedra, corners with three equivalent C(2)BC3 tetrahedra, and corners with three equivalent C(4)BC3 tetrahedra. In the second C site, C(2) is bonded to one B(1), one C(1), one C(3), and one C(5) atom to form distorted CBC3 tetrahedra that share corners with two equivalent B(1)C4 tetrahedra, corners with two equivalent C(3)BC3 tetrahedra, corners with two equivalent C(5)C4 tetrahedra, corners with three equivalent C(1)BC3 tetrahedra, and corners with three equivalent C(4)BC3 tetrahedra. In the third C site, C(3) is bonded to one B(1), one C(1), one C(2), and one C(4) atom to form CBC3 tetrahedra that share corners with two equivalent C(1)BC3 tetrahedra, corners with two equivalent C(2)BC3 tetrahedra, corners with two equivalent C(4)BC3 tetrahedra, corners with three equivalent B(1)C4 tetrahedra, and corners with three equivalent C(5)C4 tetrahedra. In the fourth C site, C(4) is bonded to one B(1), one C(3), one C(4), and one C(5) atom to form distorted CBC3 tetrahedra that share corners with two equivalent B(1)C4 tetrahedra, corners with two equivalent C(3)BC3 tetrahedra, corners with two equivalent C(5)C4 tetrahedra, corners with three equivalent C(1)BC3 tetrahedra, and corners with three equivalent C(2)BC3 tetrahedra. In the fifth C site, C(5) is bonded to one C(1), one C(2), one C(4), and one C(5) atom to form CC4 tetrahedra that share corners with two equivalent C(1)BC3 tetrahedra, corners with two equivalent C(2)BC3 tetrahedra, corners with two equivalent C(4)BC3 tetrahedra, corners with three equivalent B(1)C4 tetrahedra, and corners with three equivalent C(3)BC3 tetrahedra. is represented by the CIF file [CIF]
data_BC5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.451
_cell_length_b   4.458
_cell_length_c   4.462
_cell_angle_alpha   119.899
_cell_angle_beta   99.084
_cell_angle_gamma   100.191
_symmetry_Int_Tables_number   1
_cell_volume   72.330
_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  0.191  0.395  0.733  1.0
  B  B1  1  0.809  0.605  0.267  1.0
  C  C2  1  0.686  0.217  0.886  1.0
  C  C3  1  0.314  0.783  0.114  1.0
  C  C4  1  0.316  0.096  0.771  1.0
  C  C5  1  0.684  0.904  0.229  1.0
  C  C6  1  0.799  0.268  0.600  1.0
  C  C7  1  0.201  0.732  0.400  1.0
  C  C8  1  0.684  0.560  0.576  1.0
  C  C9  1  0.316  0.440  0.424  1.0
  C  C10  1  0.188  0.064  0.063  1.0
  C  C11  1  0.812  0.936  0.937  1.0
[/CIF]
.