data_KB
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.8
_cell_length_b   4.8
_cell_length_c   8.72
_cell_angle_alpha   105.41
_cell_angle_beta   105.41
_cell_angle_gamma   38.73
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KB
_chemical_formula_sum   'K2 B2'
_cell_volume   120.4
_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
  K  K2  1  0.31  0.0  0.11  1.0
  K  K3  1  0.29  0.0  0.26  1.0
  B  B0  1  0.6  0.0  0.18  1.0
  B  B1  1  0.99  0.0  0.18  1.0

data_KB
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.18
_cell_length_b   4.8
_cell_length_c   8.72
_cell_angle_alpha   105.41
_cell_angle_beta   90.0
_cell_angle_gamma   109.37
_symmetry_Int_Tables_number   2
_chemical_formula_structural   KB
_chemical_formula_sum   'K2 B2'
_cell_volume   120.4
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  K  K0  2  0.0  0.49  0.57  1.0
  B  B1  2  0.0  0.2  0.5  1.0

K K B B
K K B B 0 1 o o o 0 2 o o o 1 3 - o o 
BK1 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one BK1 cluster. K(1) is bonded in a 2-coordinate geometry to one K(1) and one B(1) atom. The K(1)-K(1) bond length is 1.31 Å. The K(1)-B(1) bond length is 1.40 Å. B(1) is bonded in a distorted single-bond geometry to one K(1) atom.