The structure described by K2B2S7 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 9-coordinate geometry to one S(1), two equivalent S(4), three equivalent S(2), and three equivalent S(3) atoms. B(1) is bonded to one S(1), one S(2), one S(3), and one S(4) atom to form corner-sharing BS4 tetrahedra. There are four inequivalent S sites. In the first S site, S(1) is bonded in a distorted water-like geometry to two equivalent K(1) and two equivalent B(1) atoms. In the second S site, S(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one B(1) atom. In the third S site, S(3) is bonded in a distorted single-bond geometry to three equivalent K(1), one B(1), and one S(4) atom. In the fourth S site, S(4) is bonded in a distorted single-bond geometry to two equivalent K(1), one B(1), and one S(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2B2S7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.198
_cell_length_b   8.198
_cell_length_c   11.812
_cell_angle_alpha   60.384
_cell_angle_beta   60.384
_cell_angle_gamma   49.381
_symmetry_Int_Tables_number   1
_cell_volume   505.660
_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  K0  1  0.668  0.129  0.023  1.0
  K  K1  1  0.129  0.668  0.523  1.0
  K  K2  1  0.332  0.871  0.977  1.0
  K  K3  1  0.871  0.332  0.477  1.0
  B  B4  1  0.841  0.391  0.149  1.0
  B  B5  1  0.609  0.159  0.351  1.0
  B  B6  1  0.159  0.609  0.851  1.0
  B  B7  1  0.391  0.841  0.649  1.0
  S  S8  1  0.546  0.454  0.250  1.0
  S  S9  1  0.097  0.057  0.730  1.0
  S  S10  1  0.943  0.903  0.770  1.0
  S  S11  1  0.903  0.943  0.270  1.0
  S  S12  1  0.431  0.842  0.475  1.0
  S  S13  1  0.454  0.546  0.750  1.0
  S  S14  1  0.158  0.569  0.025  1.0
  S  S15  1  0.569  0.158  0.525  1.0
  S  S16  1  0.842  0.431  0.975  1.0
  S  S17  1  0.607  0.855  0.659  1.0
  S  S18  1  0.855  0.607  0.159  1.0
  S  S19  1  0.393  0.145  0.341  1.0
  S  S20  1  0.145  0.393  0.841  1.0
  S  S21  1  0.057  0.097  0.230  1.0
[/CIF]
.
The structure described by K2B2S7 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 9-coordinate geometry to one S(1), two equivalent S(4), three equivalent S(2), and three equivalent S(3) atoms. B(1) is bonded to one S(1), one S(2), one S(3), and one S(4) atom to form corner-sharing BS4 tetrahedra. There are four inequivalent S sites. In the first S site, S(1) is bonded in a distorted water-like geometry to two equivalent K(1) and two equivalent B(1) atoms. In the second S site, S(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one B(1) atom. In the third S site, S(3) is bonded in a distorted single-bond geometry to three equivalent K(1), one B(1), and one S(4) atom. In the fourth S site, S(4) is bonded in a distorted single-bond geometry to two equivalent K(1), one B(1), and one S(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2B2S7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.198
_cell_length_b   8.198
_cell_length_c   11.812
_cell_angle_alpha   60.384
_cell_angle_beta   60.384
_cell_angle_gamma   49.381
_symmetry_Int_Tables_number   1
_cell_volume   505.660
_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  K0  1  0.668  0.129  0.023  1.0
  K  K1  1  0.129  0.668  0.523  1.0
  K  K2  1  0.332  0.871  0.977  1.0
  K  K3  1  0.871  0.332  0.477  1.0
  B  B4  1  0.841  0.391  0.149  1.0
  B  B5  1  0.609  0.159  0.351  1.0
  B  B6  1  0.159  0.609  0.851  1.0
  B  B7  1  0.391  0.841  0.649  1.0
  S  S8  1  0.546  0.454  0.250  1.0
  S  S9  1  0.097  0.057  0.730  1.0
  S  S10  1  0.943  0.903  0.770  1.0
  S  S11  1  0.903  0.943  0.270  1.0
  S  S12  1  0.431  0.842  0.475  1.0
  S  S13  1  0.454  0.546  0.750  1.0
  S  S14  1  0.158  0.569  0.025  1.0
  S  S15  1  0.569  0.158  0.525  1.0
  S  S16  1  0.842  0.431  0.975  1.0
  S  S17  1  0.607  0.855  0.659  1.0
  S  S18  1  0.855  0.607  0.159  1.0
  S  S19  1  0.393  0.145  0.341  1.0
  S  S20  1  0.145  0.393  0.841  1.0
  S  S21  1  0.057  0.097  0.230  1.0
[/CIF]
.