The crystal structure described by K3H(SeO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(4), three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. H(1) is bonded in a linear geometry to two equivalent O(4) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one Se(1) atom. In the second O site, O(4) is bonded in a 2-coordinate geometry to one K(2), one H(1), and one Se(1) atom. In the third O site, O(1) is bonded in a 1-coordinate geometry to one K(1), three equivalent K(2), and one Se(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one Se(1) atom. is represented by the CIF file [CIF]
data_K3H(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.252
_cell_length_b   8.252
_cell_length_c   10.346
_cell_angle_alpha   77.431
_cell_angle_beta   77.431
_cell_angle_gamma   42.830
_symmetry_Int_Tables_number   1
_cell_volume   465.680
_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  0.757  0.243  0.250  1.0
  K  K1  1  0.243  0.757  0.750  1.0
  K  K2  1  0.539  0.072  0.652  1.0
  K  K3  1  0.928  0.461  0.848  1.0
  K  K4  1  0.072  0.539  0.152  1.0
  K  K5  1  0.461  0.928  0.348  1.0
  H  H6  1  0.000  0.000  0.000  1.0
  H  H7  1  0.000  0.000  0.500  1.0
  Se  Se8  1  0.112  0.655  0.461  1.0
  Se  Se9  1  0.345  0.888  0.039  1.0
  Se  Se10  1  0.888  0.345  0.539  1.0
  Se  Se11  1  0.655  0.112  0.961  1.0
  O  O12  1  0.411  0.334  0.881  1.0
  O  O13  1  0.666  0.589  0.619  1.0
  O  O14  1  0.589  0.666  0.119  1.0
  O  O15  1  0.334  0.411  0.381  1.0
  O  O16  1  0.594  0.096  0.125  1.0
  O  O17  1  0.904  0.406  0.375  1.0
  O  O18  1  0.406  0.904  0.875  1.0
  O  O19  1  0.096  0.594  0.625  1.0
  O  O20  1  0.851  0.832  0.400  1.0
  O  O21  1  0.168  0.149  0.100  1.0
  O  O22  1  0.149  0.168  0.600  1.0
  O  O23  1  0.832  0.851  0.900  1.0
  O  O24  1  0.170  0.825  0.438  1.0
  O  O25  1  0.175  0.830  0.062  1.0
  O  O26  1  0.830  0.175  0.562  1.0
  O  O27  1  0.825  0.170  0.938  1.0
[/CIF]
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The crystal structure described by K3H(SeO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(4), three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. H(1) is bonded in a linear geometry to two equivalent O(4) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one Se(1) atom. In the second O site, O(4) is bonded in a 2-coordinate geometry to one K(2), one H(1), and one Se(1) atom. In the third O site, O(1) is bonded in a 1-coordinate geometry to one K(1), three equivalent K(2), and one Se(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one Se(1) atom. is represented by the CIF file [CIF]
data_K3H(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.252
_cell_length_b   8.252
_cell_length_c   10.346
_cell_angle_alpha   77.431
_cell_angle_beta   77.431
_cell_angle_gamma   42.830
_symmetry_Int_Tables_number   1
_cell_volume   465.680
_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  0.757  0.243  0.250  1.0
  K  K1  1  0.243  0.757  0.750  1.0
  K  K2  1  0.539  0.072  0.652  1.0
  K  K3  1  0.928  0.461  0.848  1.0
  K  K4  1  0.072  0.539  0.152  1.0
  K  K5  1  0.461  0.928  0.348  1.0
  H  H6  1  0.000  0.000  0.000  1.0
  H  H7  1  0.000  0.000  0.500  1.0
  Se  Se8  1  0.112  0.655  0.461  1.0
  Se  Se9  1  0.345  0.888  0.039  1.0
  Se  Se10  1  0.888  0.345  0.539  1.0
  Se  Se11  1  0.655  0.112  0.961  1.0
  O  O12  1  0.411  0.334  0.881  1.0
  O  O13  1  0.666  0.589  0.619  1.0
  O  O14  1  0.589  0.666  0.119  1.0
  O  O15  1  0.334  0.411  0.381  1.0
  O  O16  1  0.594  0.096  0.125  1.0
  O  O17  1  0.904  0.406  0.375  1.0
  O  O18  1  0.406  0.904  0.875  1.0
  O  O19  1  0.096  0.594  0.625  1.0
  O  O20  1  0.851  0.832  0.400  1.0
  O  O21  1  0.168  0.149  0.100  1.0
  O  O22  1  0.149  0.168  0.600  1.0
  O  O23  1  0.832  0.851  0.900  1.0
  O  O24  1  0.170  0.825  0.438  1.0
  O  O25  1  0.175  0.830  0.062  1.0
  O  O26  1  0.830  0.175  0.562  1.0
  O  O27  1  0.825  0.170  0.938  1.0
[/CIF]
.