data_K2BeSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.76
_cell_length_b   9.76
_cell_length_c   9.76
_cell_angle_alpha   23.96
_cell_angle_beta   23.96
_cell_angle_gamma   23.96
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2BeSi
_chemical_formula_sum   'K2 Be1 Si1'
_cell_volume   134.78
_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
  K  K1  1  0.0  0.0  0.43  1.0
  K  K2  1  0.0  0.0  0.52  1.0
  Be  Be0  1  0.0  0.0  0.03  1.0
  Si  Si3  1  0.0  0.0  0.5  1.0

data_K2BeSi
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.02
_cell_length_b   4.05
_cell_length_c   9.76
_cell_angle_alpha   90.0
_cell_angle_beta   103.87
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2BeSi
_chemical_formula_sum   'K4 Be2 Si2'
_cell_volume   269.57
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  0.0  0.48  1.0
  K  K1  2  0.0  0.0  0.57  1.0
  Be  Be2  2  0.0  0.0  0.97  1.0
  Si  Si3  2  0.0  0.0  0.5  1.0

K K Be Si
BeK2Si is Cyanogen Chloride-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two 7440-41-7 atoms and two K2Si clusters. In each K2Si cluster, there are two inequivalent K sites. In the first K site, K(1) is bonded in a single-bond geometry to one Si(1) atom. The K(1)-Si(1) bond length is 0.64 Å. In the second K site, K(2) is bonded in a single-bond geometry to one Si(1) atom. The K(2)-Si(1) bond length is 0.23 Å. Si(1) is bonded in a linear geometry to one K(1) and one K(2) atom.