The material described by HIO4 crystallizes in the monoclinic P2_1/c space group. H(1) is bonded in a distorted single-bond geometry to one O(3) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to two equivalent I(1) atoms. In the second O site, O(2) is bonded in a water-like geometry to two equivalent I(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to one H(1) and one I(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one H(1) and one I(1) atom. I(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form edge-sharing IO6 octahedra. is represented by the CIF file [CIF]
data_HIO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.316
_cell_length_b   5.105
_cell_length_c   10.323
_cell_angle_alpha   66.628
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   305.504
_cell_formula_units_Z   4
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
  H  H0  1  0.731  0.759  0.219  1.0
  H  H1  1  0.769  0.759  0.719  1.0
  H  H2  1  0.231  0.241  0.281  1.0
  H  H3  1  0.269  0.241  0.781  1.0
  I  I4  1  0.858  0.751  0.996  1.0
  I  I5  1  0.358  0.249  0.504  1.0
  I  I6  1  0.642  0.751  0.496  1.0
  I  I7  1  0.142  0.249  0.004  1.0
  O  O8  1  0.598  0.343  0.609  1.0
  O  O9  1  0.089  0.836  0.110  1.0
  O  O10  1  0.658  0.767  0.129  1.0
  O  O11  1  0.164  0.254  0.629  1.0
  O  O12  1  0.664  0.746  0.871  1.0
  O  O13  1  0.902  0.343  0.109  1.0
  O  O14  1  0.158  0.233  0.371  1.0
  O  O15  1  0.411  0.836  0.610  1.0
  O  O16  1  0.589  0.164  0.390  1.0
  O  O17  1  0.842  0.767  0.629  1.0
  O  O18  1  0.098  0.657  0.891  1.0
  O  O19  1  0.336  0.254  0.129  1.0
  O  O20  1  0.836  0.746  0.371  1.0
  O  O21  1  0.342  0.233  0.871  1.0
  O  O22  1  0.911  0.164  0.890  1.0
  O  O23  1  0.402  0.657  0.391  1.0
[/CIF]
.
The material described by HIO4 crystallizes in the monoclinic P2_1/c space group. H(1) is bonded in a distorted single-bond geometry to one O(3) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to two equivalent I(1) atoms. In the second O site, O(2) is bonded in a water-like geometry to two equivalent I(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to one H(1) and one I(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one H(1) and one I(1) atom. I(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form edge-sharing IO6 octahedra. is represented by the CIF file [CIF]
data_HIO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.316
_cell_length_b   5.105
_cell_length_c   10.323
_cell_angle_alpha   66.628
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   305.504
_cell_formula_units_Z   4
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
  H  H0  1  0.731  0.759  0.219  1.0
  H  H1  1  0.769  0.759  0.719  1.0
  H  H2  1  0.231  0.241  0.281  1.0
  H  H3  1  0.269  0.241  0.781  1.0
  I  I4  1  0.858  0.751  0.996  1.0
  I  I5  1  0.358  0.249  0.504  1.0
  I  I6  1  0.642  0.751  0.496  1.0
  I  I7  1  0.142  0.249  0.004  1.0
  O  O8  1  0.598  0.343  0.609  1.0
  O  O9  1  0.089  0.836  0.110  1.0
  O  O10  1  0.658  0.767  0.129  1.0
  O  O11  1  0.164  0.254  0.629  1.0
  O  O12  1  0.664  0.746  0.871  1.0
  O  O13  1  0.902  0.343  0.109  1.0
  O  O14  1  0.158  0.233  0.371  1.0
  O  O15  1  0.411  0.836  0.610  1.0
  O  O16  1  0.589  0.164  0.390  1.0
  O  O17  1  0.842  0.767  0.629  1.0
  O  O18  1  0.098  0.657  0.891  1.0
  O  O19  1  0.336  0.254  0.129  1.0
  O  O20  1  0.836  0.746  0.371  1.0
  O  O21  1  0.342  0.233  0.871  1.0
  O  O22  1  0.911  0.164  0.890  1.0
  O  O23  1  0.402  0.657  0.391  1.0
[/CIF]
.