The compound described by K2CdH4(SeO5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), one O(8), one O(9), two equivalent O(5), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(8), and two equivalent O(2) atoms. Cd(1) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form CdO6 octahedra that share corners with two equivalent Se(1)O4 tetrahedra and corners with two equivalent Se(2)O4 tetrahedra. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(9) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(10) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(10) atom. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SeO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-54°. In the second Se site, Se(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form SeO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-54°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2) and one Se(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent K(2) and one Se(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(2), one Cd(1), and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted tetrahedral geometry to one K(1), one K(2), one Cd(1), and one Se(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Se(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(1), one Cd(1), and one Se(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cd(1), and one Se(2) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one K(1), one Cd(1), one H(1), and one H(2) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one K(2), one Cd(1), one H(3), and one H(4) atom. is represented by the CIF card [CIF]
data_K2CdH4(SeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.709
_cell_length_b   7.700
_cell_length_c   11.591
_cell_angle_alpha   72.151
_cell_angle_beta   74.464
_cell_angle_gamma   70.043
_symmetry_Int_Tables_number   1
_cell_volume   526.678
_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  0.798  0.748  0.401  1.0
  K  K1  1  0.202  0.252  0.599  1.0
  K  K2  1  0.730  0.267  0.079  1.0
  K  K3  1  0.270  0.733  0.921  1.0
  Cd  Cd4  1  0.752  0.974  0.749  1.0
  Cd  Cd5  1  0.248  0.026  0.251  1.0
  H  H6  1  0.698  0.361  0.657  1.0
  H  H7  1  0.302  0.639  0.343  1.0
  H  H8  1  0.663  0.311  0.802  1.0
  H  H9  1  0.337  0.689  0.198  1.0
  H  H10  1  0.647  0.666  0.707  1.0
  H  H11  1  0.353  0.334  0.293  1.0
  H  H12  1  0.831  0.585  0.792  1.0
  H  H13  1  0.169  0.415  0.208  1.0
  Se  Se14  1  0.737  0.765  0.084  1.0
  Se  Se15  1  0.263  0.235  0.916  1.0
  Se  Se16  1  0.739  0.231  0.425  1.0
  Se  Se17  1  0.261  0.769  0.575  1.0
  O  O18  1  0.955  0.603  0.131  1.0
  O  O19  1  0.045  0.397  0.869  1.0
  O  O20  1  0.561  0.663  0.074  1.0
  O  O21  1  0.439  0.337  0.926  1.0
  O  O22  1  0.819  0.905  0.948  1.0
  O  O23  1  0.181  0.095  0.052  1.0
  O  O24  1  0.621  0.907  0.185  1.0
  O  O25  1  0.379  0.093  0.815  1.0
  O  O26  1  0.879  0.349  0.454  1.0
  O  O27  1  0.121  0.651  0.546  1.0
  O  O28  1  0.505  0.375  0.384  1.0
  O  O29  1  0.495  0.625  0.616  1.0
  O  O30  1  0.680  0.061  0.549  1.0
  O  O31  1  0.320  0.939  0.451  1.0
  O  O32  1  0.878  0.121  0.309  1.0
  O  O33  1  0.122  0.879  0.691  1.0
  O  O34  1  0.770  0.280  0.727  1.0
  O  O35  1  0.230  0.720  0.273  1.0
  O  O36  1  0.695  0.684  0.776  1.0
  O  O37  1  0.305  0.316  0.224  1.0
[/CIF]
.
The compound described by K2CdH4(SeO5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), one O(8), one O(9), two equivalent O(5), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(8), and two equivalent O(2) atoms. Cd(1) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form CdO6 octahedra that share corners with two equivalent Se(1)O4 tetrahedra and corners with two equivalent Se(2)O4 tetrahedra. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(9) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(10) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(10) atom. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SeO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-54°. In the second Se site, Se(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form SeO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-54°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2) and one Se(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent K(2) and one Se(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(2), one Cd(1), and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted tetrahedral geometry to one K(1), one K(2), one Cd(1), and one Se(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Se(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(1), one Cd(1), and one Se(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cd(1), and one Se(2) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one K(1), one Cd(1), one H(1), and one H(2) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one K(2), one Cd(1), one H(3), and one H(4) atom. is represented by the CIF card [CIF]
data_K2CdH4(SeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.709
_cell_length_b   7.700
_cell_length_c   11.591
_cell_angle_alpha   72.151
_cell_angle_beta   74.464
_cell_angle_gamma   70.043
_symmetry_Int_Tables_number   1
_cell_volume   526.678
_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  0.798  0.748  0.401  1.0
  K  K1  1  0.202  0.252  0.599  1.0
  K  K2  1  0.730  0.267  0.079  1.0
  K  K3  1  0.270  0.733  0.921  1.0
  Cd  Cd4  1  0.752  0.974  0.749  1.0
  Cd  Cd5  1  0.248  0.026  0.251  1.0
  H  H6  1  0.698  0.361  0.657  1.0
  H  H7  1  0.302  0.639  0.343  1.0
  H  H8  1  0.663  0.311  0.802  1.0
  H  H9  1  0.337  0.689  0.198  1.0
  H  H10  1  0.647  0.666  0.707  1.0
  H  H11  1  0.353  0.334  0.293  1.0
  H  H12  1  0.831  0.585  0.792  1.0
  H  H13  1  0.169  0.415  0.208  1.0
  Se  Se14  1  0.737  0.765  0.084  1.0
  Se  Se15  1  0.263  0.235  0.916  1.0
  Se  Se16  1  0.739  0.231  0.425  1.0
  Se  Se17  1  0.261  0.769  0.575  1.0
  O  O18  1  0.955  0.603  0.131  1.0
  O  O19  1  0.045  0.397  0.869  1.0
  O  O20  1  0.561  0.663  0.074  1.0
  O  O21  1  0.439  0.337  0.926  1.0
  O  O22  1  0.819  0.905  0.948  1.0
  O  O23  1  0.181  0.095  0.052  1.0
  O  O24  1  0.621  0.907  0.185  1.0
  O  O25  1  0.379  0.093  0.815  1.0
  O  O26  1  0.879  0.349  0.454  1.0
  O  O27  1  0.121  0.651  0.546  1.0
  O  O28  1  0.505  0.375  0.384  1.0
  O  O29  1  0.495  0.625  0.616  1.0
  O  O30  1  0.680  0.061  0.549  1.0
  O  O31  1  0.320  0.939  0.451  1.0
  O  O32  1  0.878  0.121  0.309  1.0
  O  O33  1  0.122  0.879  0.691  1.0
  O  O34  1  0.770  0.280  0.727  1.0
  O  O35  1  0.230  0.720  0.273  1.0
  O  O36  1  0.695  0.684  0.776  1.0
  O  O37  1  0.305  0.316  0.224  1.0
[/CIF]
.