The material structure described by HIO4 crystallizes in the monoclinic C2 space group. H(1) is bonded in a linear 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 one I(1) and one I(2) atom. In the second O site, O(2) is bonded in a water-like geometry to one I(1) and one I(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one H(1) and one I(2) 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. There are two inequivalent I sites. In the first I site, I(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted edge-sharing IO6 octahedra. In the second I site, I(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form edge-sharing IO6 octahedra. is represented by the CIF card [CIF]
data_HIO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.909
_cell_length_b   5.909
_cell_length_c   5.085
_cell_angle_alpha   82.806
_cell_angle_beta   82.806
_cell_angle_gamma   71.947
_symmetry_Int_Tables_number   1
_cell_volume   166.760
_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
  H  H0  1  0.513  0.041  0.725  1.0
  H  H1  1  0.959  0.487  0.275  1.0
  I  I2  1  0.139  0.861  0.000  1.0
  I  I3  1  0.878  0.122  0.500  1.0
  O  O4  1  0.969  0.804  0.709  1.0
  O  O5  1  0.196  0.031  0.291  1.0
  O  O6  1  0.023  0.195  0.788  1.0
  O  O7  1  0.805  0.977  0.212  1.0
  O  O8  1  0.561  0.194  0.645  1.0
  O  O9  1  0.806  0.439  0.355  1.0
  O  O10  1  0.437  0.826  0.845  1.0
  O  O11  1  0.174  0.563  0.155  1.0
[/CIF]
.
The material structure described by HIO4 crystallizes in the monoclinic C2 space group. H(1) is bonded in a linear 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 one I(1) and one I(2) atom. In the second O site, O(2) is bonded in a water-like geometry to one I(1) and one I(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one H(1) and one I(2) 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. There are two inequivalent I sites. In the first I site, I(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted edge-sharing IO6 octahedra. In the second I site, I(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form edge-sharing IO6 octahedra. is represented by the CIF card [CIF]
data_HIO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.909
_cell_length_b   5.909
_cell_length_c   5.085
_cell_angle_alpha   82.806
_cell_angle_beta   82.806
_cell_angle_gamma   71.947
_symmetry_Int_Tables_number   1
_cell_volume   166.760
_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
  H  H0  1  0.513  0.041  0.725  1.0
  H  H1  1  0.959  0.487  0.275  1.0
  I  I2  1  0.139  0.861  0.000  1.0
  I  I3  1  0.878  0.122  0.500  1.0
  O  O4  1  0.969  0.804  0.709  1.0
  O  O5  1  0.196  0.031  0.291  1.0
  O  O6  1  0.023  0.195  0.788  1.0
  O  O7  1  0.805  0.977  0.212  1.0
  O  O8  1  0.561  0.194  0.645  1.0
  O  O9  1  0.806  0.439  0.355  1.0
  O  O10  1  0.437  0.826  0.845  1.0
  O  O11  1  0.174  0.563  0.155  1.0
[/CIF]
.