The compound described by As3O5(OH) crystallizes in the monoclinic Pc space group. There are six inequivalent As sites. In the first As site, As(1) is bonded in a 3-coordinate geometry to one O(1), one O(10), and one O(2) atom. In the second As site, As(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(9) atom. In the third As site, As(3) is bonded in a trigonal non-coplanar geometry to one O(11), one O(5), and one O(7) atom. In the fourth As site, As(4) is bonded in a distorted trigonal non-coplanar geometry to one O(6), one O(7), and one O(8) atom. In the fifth As site, As(5) is bonded in a tetrahedral geometry to one O(11), one O(3), one O(5), and one O(9) atom. In the sixth As site, As(6) is bonded in a tetrahedral geometry to one O(10), one O(12), one O(4), and one O(6) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(1) and one O(3) atom. In the second H site, H(2) is bonded in a bent 150 degrees geometry to one O(12) and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one As(1), one As(2), and one H(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one As(5) and one H(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one As(2) and one As(6) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one As(3) and one As(5) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one As(4) and one As(6) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one As(3) and one As(4) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one As(4) and one H(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one As(2) and one As(5) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one As(1) and one As(6) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one As(3) and one As(5) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one As(6) and one H(2) atom. is represented by the CIF file [CIF]
data_As3HO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.088
_cell_length_b   9.976
_cell_length_c   11.629
_cell_angle_alpha   72.730
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   563.702
_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
  As  As0  1  0.447  0.299  0.083  1.0
  As  As1  1  0.919  0.174  0.950  1.0
  As  As2  1  0.081  0.674  0.950  1.0
  As  As3  1  0.553  0.799  0.083  1.0
  As  As4  1  0.747  0.832  0.597  1.0
  As  As5  1  0.360  0.710  0.429  1.0
  As  As6  1  0.640  0.210  0.429  1.0
  As  As7  1  0.253  0.332  0.597  1.0
  As  As8  1  0.630  0.490  0.776  1.0
  As  As9  1  0.143  0.005  0.236  1.0
  As  As10  1  0.857  0.505  0.236  1.0
  As  As11  1  0.370  0.990  0.776  1.0
  H  H12  1  0.379  0.138  0.937  1.0
  H  H13  1  0.621  0.638  0.937  1.0
  H  H14  1  0.958  0.627  0.425  1.0
  H  H15  1  0.042  0.127  0.425  1.0
  O  O16  1  0.286  0.226  0.956  1.0
  O  O17  1  0.783  0.266  0.049  1.0
  O  O18  1  0.217  0.766  0.049  1.0
  O  O19  1  0.714  0.726  0.956  1.0
  O  O20  1  0.502  0.517  0.905  1.0
  O  O21  1  0.980  0.005  0.106  1.0
  O  O22  1  0.020  0.505  0.106  1.0
  O  O23  1  0.498  0.017  0.905  1.0
  O  O24  1  0.778  0.656  0.708  1.0
  O  O25  1  0.332  0.847  0.277  1.0
  O  O26  1  0.668  0.347  0.277  1.0
  O  O27  1  0.222  0.156  0.708  1.0
  O  O28  1  0.435  0.820  0.526  1.0
  O  O29  1  0.015  0.698  0.468  1.0
  O  O30  1  0.985  0.198  0.468  1.0
  O  O31  1  0.565  0.320  0.526  1.0
  O  O32  1  0.863  0.361  0.804  1.0
  O  O33  1  0.404  0.126  0.199  1.0
  O  O34  1  0.596  0.626  0.199  1.0
  O  O35  1  0.137  0.861  0.804  1.0
  O  O36  1  0.395  0.463  0.676  1.0
  O  O37  1  0.970  0.020  0.353  1.0
  O  O38  1  0.030  0.520  0.353  1.0
  O  O39  1  0.605  0.963  0.676  1.0
[/CIF]
.
The compound described by As3O5(OH) crystallizes in the monoclinic Pc space group. There are six inequivalent As sites. In the first As site, As(1) is bonded in a 3-coordinate geometry to one O(1), one O(10), and one O(2) atom. In the second As site, As(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(9) atom. In the third As site, As(3) is bonded in a trigonal non-coplanar geometry to one O(11), one O(5), and one O(7) atom. In the fourth As site, As(4) is bonded in a distorted trigonal non-coplanar geometry to one O(6), one O(7), and one O(8) atom. In the fifth As site, As(5) is bonded in a tetrahedral geometry to one O(11), one O(3), one O(5), and one O(9) atom. In the sixth As site, As(6) is bonded in a tetrahedral geometry to one O(10), one O(12), one O(4), and one O(6) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(1) and one O(3) atom. In the second H site, H(2) is bonded in a bent 150 degrees geometry to one O(12) and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one As(1), one As(2), and one H(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one As(5) and one H(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one As(2) and one As(6) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one As(3) and one As(5) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one As(4) and one As(6) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one As(3) and one As(4) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one As(4) and one H(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one As(2) and one As(5) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one As(1) and one As(6) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one As(3) and one As(5) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one As(6) and one H(2) atom. is represented by the CIF file [CIF]
data_As3HO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.088
_cell_length_b   9.976
_cell_length_c   11.629
_cell_angle_alpha   72.730
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   563.702
_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
  As  As0  1  0.447  0.299  0.083  1.0
  As  As1  1  0.919  0.174  0.950  1.0
  As  As2  1  0.081  0.674  0.950  1.0
  As  As3  1  0.553  0.799  0.083  1.0
  As  As4  1  0.747  0.832  0.597  1.0
  As  As5  1  0.360  0.710  0.429  1.0
  As  As6  1  0.640  0.210  0.429  1.0
  As  As7  1  0.253  0.332  0.597  1.0
  As  As8  1  0.630  0.490  0.776  1.0
  As  As9  1  0.143  0.005  0.236  1.0
  As  As10  1  0.857  0.505  0.236  1.0
  As  As11  1  0.370  0.990  0.776  1.0
  H  H12  1  0.379  0.138  0.937  1.0
  H  H13  1  0.621  0.638  0.937  1.0
  H  H14  1  0.958  0.627  0.425  1.0
  H  H15  1  0.042  0.127  0.425  1.0
  O  O16  1  0.286  0.226  0.956  1.0
  O  O17  1  0.783  0.266  0.049  1.0
  O  O18  1  0.217  0.766  0.049  1.0
  O  O19  1  0.714  0.726  0.956  1.0
  O  O20  1  0.502  0.517  0.905  1.0
  O  O21  1  0.980  0.005  0.106  1.0
  O  O22  1  0.020  0.505  0.106  1.0
  O  O23  1  0.498  0.017  0.905  1.0
  O  O24  1  0.778  0.656  0.708  1.0
  O  O25  1  0.332  0.847  0.277  1.0
  O  O26  1  0.668  0.347  0.277  1.0
  O  O27  1  0.222  0.156  0.708  1.0
  O  O28  1  0.435  0.820  0.526  1.0
  O  O29  1  0.015  0.698  0.468  1.0
  O  O30  1  0.985  0.198  0.468  1.0
  O  O31  1  0.565  0.320  0.526  1.0
  O  O32  1  0.863  0.361  0.804  1.0
  O  O33  1  0.404  0.126  0.199  1.0
  O  O34  1  0.596  0.626  0.199  1.0
  O  O35  1  0.137  0.861  0.804  1.0
  O  O36  1  0.395  0.463  0.676  1.0
  O  O37  1  0.970  0.020  0.353  1.0
  O  O38  1  0.030  0.520  0.353  1.0
  O  O39  1  0.605  0.963  0.676  1.0
[/CIF]
.