The crystal structure described by LiAs2H3O7 crystallizes in the monoclinic C2/m space group. Li(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles are 61°. In the second As site, As(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form AsO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra and  an edgeedge with one As(2)O6 octahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(5) atom. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one As(2), and one H(1) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent As(2) and one H(2) atom. In the third O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one As(1) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one As(1) and one H(2) atom. is represented by the CIF file [CIF]
data_LiAs2H3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.299
_cell_length_b   7.299
_cell_length_c   5.609
_cell_angle_alpha   70.292
_cell_angle_beta   70.292
_cell_angle_gamma   77.033
_symmetry_Int_Tables_number   1
_cell_volume   262.781
_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
  Li  Li0  1  0.153  0.847  0.000  1.0
  Li  Li1  1  0.847  0.153  0.000  1.0
  As  As2  1  0.272  0.272  0.959  1.0
  As  As3  1  0.728  0.728  0.041  1.0
  As  As4  1  0.345  0.655  0.500  1.0
  As  As5  1  0.655  0.345  0.500  1.0
  H  H6  1  0.014  0.718  0.509  1.0
  H  H7  1  0.718  0.014  0.509  1.0
  H  H8  1  0.986  0.282  0.491  1.0
  H  H9  1  0.282  0.986  0.491  1.0
  H  H10  1  0.313  0.313  0.333  1.0
  H  H11  1  0.687  0.687  0.667  1.0
  O  O12  1  0.134  0.134  0.935  1.0
  O  O13  1  0.866  0.866  0.065  1.0
  O  O14  1  0.210  0.522  0.843  1.0
  O  O15  1  0.522  0.210  0.843  1.0
  O  O16  1  0.790  0.478  0.157  1.0
  O  O17  1  0.478  0.790  0.157  1.0
  O  O18  1  0.233  0.233  0.294  1.0
  O  O19  1  0.767  0.767  0.706  1.0
  O  O20  1  0.140  0.705  0.374  1.0
  O  O21  1  0.705  0.140  0.374  1.0
  O  O22  1  0.860  0.295  0.626  1.0
  O  O23  1  0.295  0.860  0.626  1.0
  O  O24  1  0.421  0.421  0.416  1.0
  O  O25  1  0.579  0.579  0.584  1.0
[/CIF]
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The crystal structure described by LiAs2H3O7 crystallizes in the monoclinic C2/m space group. Li(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles are 61°. In the second As site, As(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form AsO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra and  an edgeedge with one As(2)O6 octahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(5) atom. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one As(2), and one H(1) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent As(2) and one H(2) atom. In the third O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one As(1) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one As(1) and one H(2) atom. is represented by the CIF file [CIF]
data_LiAs2H3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.299
_cell_length_b   7.299
_cell_length_c   5.609
_cell_angle_alpha   70.292
_cell_angle_beta   70.292
_cell_angle_gamma   77.033
_symmetry_Int_Tables_number   1
_cell_volume   262.781
_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
  Li  Li0  1  0.153  0.847  0.000  1.0
  Li  Li1  1  0.847  0.153  0.000  1.0
  As  As2  1  0.272  0.272  0.959  1.0
  As  As3  1  0.728  0.728  0.041  1.0
  As  As4  1  0.345  0.655  0.500  1.0
  As  As5  1  0.655  0.345  0.500  1.0
  H  H6  1  0.014  0.718  0.509  1.0
  H  H7  1  0.718  0.014  0.509  1.0
  H  H8  1  0.986  0.282  0.491  1.0
  H  H9  1  0.282  0.986  0.491  1.0
  H  H10  1  0.313  0.313  0.333  1.0
  H  H11  1  0.687  0.687  0.667  1.0
  O  O12  1  0.134  0.134  0.935  1.0
  O  O13  1  0.866  0.866  0.065  1.0
  O  O14  1  0.210  0.522  0.843  1.0
  O  O15  1  0.522  0.210  0.843  1.0
  O  O16  1  0.790  0.478  0.157  1.0
  O  O17  1  0.478  0.790  0.157  1.0
  O  O18  1  0.233  0.233  0.294  1.0
  O  O19  1  0.767  0.767  0.706  1.0
  O  O20  1  0.140  0.705  0.374  1.0
  O  O21  1  0.705  0.140  0.374  1.0
  O  O22  1  0.860  0.295  0.626  1.0
  O  O23  1  0.295  0.860  0.626  1.0
  O  O24  1  0.421  0.421  0.416  1.0
  O  O25  1  0.579  0.579  0.584  1.0
[/CIF]
.