The compound described by K3H(SeO4)2 crystallizes in the monoclinic Cc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one O(2), one O(4), one O(6), one O(8), two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(1), one O(3), one O(5), one O(7), two equivalent O(2), two equivalent O(4), and two equivalent O(8) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. H(1) is bonded in a linear geometry to one O(5) and one O(6) atom. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(5), and one O(7) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 1-coordinate geometry to one K(2), one H(1), and one Se(1) atom. In the second O site, O(6) is bonded in a distorted water-like geometry to one K(1), one H(1), and one Se(2) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one K(2), one K(3), two equivalent K(1), and one Se(1) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(3), two equivalent K(2), and one Se(2) atom. In the fifth O site, O(1) is bonded in a distorted single-bond geometry to one K(2), one K(3), two equivalent K(1), and one Se(1) atom. In the sixth O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(3), two equivalent K(2), and one Se(2) atom. In the seventh O site, O(3) is bonded in a 1-coordinate geometry to one K(2), one K(3), two equivalent K(1), and one Se(1) atom. In the eighth O site, O(4) is bonded in a 1-coordinate geometry to one K(1), one K(3), two equivalent K(2), and one Se(2) atom. is represented by the CIF file [CIF]
data_K3H(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.232
_cell_length_b   8.232
_cell_length_c   10.375
_cell_angle_alpha   77.522
_cell_angle_beta   77.522
_cell_angle_gamma   42.917
_symmetry_Int_Tables_number   1
_cell_volume   465.614
_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  0.932  0.461  0.848  1.0
  K  K1  1  0.461  0.932  0.348  1.0
  K  K2  1  0.070  0.540  0.152  1.0
  K  K3  1  0.540  0.070  0.652  1.0
  K  K4  1  0.758  0.239  0.251  1.0
  K  K5  1  0.239  0.758  0.751  1.0
  H  H6  1  0.023  0.975  0.009  1.0
  H  H7  1  0.975  0.023  0.509  1.0
  Se  Se8  1  0.348  0.888  0.038  1.0
  Se  Se9  1  0.888  0.348  0.538  1.0
  Se  Se10  1  0.655  0.116  0.960  1.0
  Se  Se11  1  0.116  0.655  0.460  1.0
  O  O12  1  0.167  0.148  0.102  1.0
  O  O13  1  0.148  0.167  0.602  1.0
  O  O14  1  0.829  0.853  0.899  1.0
  O  O15  1  0.853  0.829  0.399  1.0
  O  O16  1  0.590  0.664  0.118  1.0
  O  O17  1  0.664  0.590  0.618  1.0
  O  O18  1  0.406  0.335  0.882  1.0
  O  O19  1  0.335  0.406  0.382  1.0
  O  O20  1  0.179  0.824  0.064  1.0
  O  O21  1  0.824  0.179  0.564  1.0
  O  O22  1  0.823  0.172  0.938  1.0
  O  O23  1  0.172  0.823  0.438  1.0
  O  O24  1  0.404  0.903  0.875  1.0
  O  O25  1  0.903  0.404  0.375  1.0
  O  O26  1  0.594  0.097  0.124  1.0
  O  O27  1  0.097  0.594  0.624  1.0
[/CIF]
.
The compound described by K3H(SeO4)2 crystallizes in the monoclinic Cc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one O(2), one O(4), one O(6), one O(8), two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(1), one O(3), one O(5), one O(7), two equivalent O(2), two equivalent O(4), and two equivalent O(8) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. H(1) is bonded in a linear geometry to one O(5) and one O(6) atom. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(5), and one O(7) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 1-coordinate geometry to one K(2), one H(1), and one Se(1) atom. In the second O site, O(6) is bonded in a distorted water-like geometry to one K(1), one H(1), and one Se(2) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one K(2), one K(3), two equivalent K(1), and one Se(1) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(3), two equivalent K(2), and one Se(2) atom. In the fifth O site, O(1) is bonded in a distorted single-bond geometry to one K(2), one K(3), two equivalent K(1), and one Se(1) atom. In the sixth O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(3), two equivalent K(2), and one Se(2) atom. In the seventh O site, O(3) is bonded in a 1-coordinate geometry to one K(2), one K(3), two equivalent K(1), and one Se(1) atom. In the eighth O site, O(4) is bonded in a 1-coordinate geometry to one K(1), one K(3), two equivalent K(2), and one Se(2) atom. is represented by the CIF file [CIF]
data_K3H(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.232
_cell_length_b   8.232
_cell_length_c   10.375
_cell_angle_alpha   77.522
_cell_angle_beta   77.522
_cell_angle_gamma   42.917
_symmetry_Int_Tables_number   1
_cell_volume   465.614
_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  0.932  0.461  0.848  1.0
  K  K1  1  0.461  0.932  0.348  1.0
  K  K2  1  0.070  0.540  0.152  1.0
  K  K3  1  0.540  0.070  0.652  1.0
  K  K4  1  0.758  0.239  0.251  1.0
  K  K5  1  0.239  0.758  0.751  1.0
  H  H6  1  0.023  0.975  0.009  1.0
  H  H7  1  0.975  0.023  0.509  1.0
  Se  Se8  1  0.348  0.888  0.038  1.0
  Se  Se9  1  0.888  0.348  0.538  1.0
  Se  Se10  1  0.655  0.116  0.960  1.0
  Se  Se11  1  0.116  0.655  0.460  1.0
  O  O12  1  0.167  0.148  0.102  1.0
  O  O13  1  0.148  0.167  0.602  1.0
  O  O14  1  0.829  0.853  0.899  1.0
  O  O15  1  0.853  0.829  0.399  1.0
  O  O16  1  0.590  0.664  0.118  1.0
  O  O17  1  0.664  0.590  0.618  1.0
  O  O18  1  0.406  0.335  0.882  1.0
  O  O19  1  0.335  0.406  0.382  1.0
  O  O20  1  0.179  0.824  0.064  1.0
  O  O21  1  0.824  0.179  0.564  1.0
  O  O22  1  0.823  0.172  0.938  1.0
  O  O23  1  0.172  0.823  0.438  1.0
  O  O24  1  0.404  0.903  0.875  1.0
  O  O25  1  0.903  0.404  0.375  1.0
  O  O26  1  0.594  0.097  0.124  1.0
  O  O27  1  0.097  0.594  0.624  1.0
[/CIF]
.