data_K2SiW
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.85
_cell_length_b   3.85
_cell_length_c   7.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2SiW
_chemical_formula_sum   'K2 Si1 W1'
_cell_volume   103.9
_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  K0  1  0.0  0.0  0.0  1.0
  K  K1  1  0.92  0.92  0.77  1.0
  Si  Si2  1  0.0  0.0  0.52  1.0
  W  W3  1  0.92  0.92  0.24  1.0

data_K2SiW
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.44
_cell_length_b   5.44
_cell_length_c   7.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2SiW
_chemical_formula_sum   'K4 Si2 W2'
_cell_volume   207.81
_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  0.0  1.0
  K  K1  2  0.42  0.5  0.77  1.0
  Si  Si2  2  0.0  0.0  0.52  1.0
  W  W3  2  0.42  0.5  0.24  1.0

K K Si W
K K Si W 0 1 - - - 0 3 - - o 1 2 + + o 2 3 - - o 
K2WSi crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two K2WSi clusters. There are two inequivalent K sites. In the first K site, K(1) is bonded in a distorted single-bond geometry to one W(1) atom. The K(1)-W(1) bond length is 1.75 Å. In the second K site, K(2) is bonded in a distorted single-bond geometry to one Si(1) atom. The K(2)-Si(1) bond length is 1.77 Å. W(1) is bonded in a distorted bent 150 degrees geometry to one K(1) and one Si(1) atom. The W(1)-Si(1) bond length is 2.00 Å. Si(1) is bonded in a bent 150 degrees geometry to one K(2) and one W(1) atom.