The crystal structure described by H4OTa2O6 crystallizes in the orthorhombic Fdd2 space group. Ta(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. In the second H site, H(2) is bonded in a linear geometry to one O(4) and one O(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Ta(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Ta(1) and one H(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one H(3) and two equivalent H(2) atoms. is represented by the CIF card [CIF]
data_Ta2H4O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.209
_cell_length_b   7.567
_cell_length_c   7.370
_cell_angle_alpha   66.665
_cell_angle_beta   57.818
_cell_angle_gamma   55.517
_symmetry_Int_Tables_number   1
_cell_volume   316.418
_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
  Ta  Ta0  1  0.275  0.501  0.794  1.0
  Ta  Ta1  1  0.749  0.975  0.820  1.0
  Ta  Ta2  1  0.794  0.430  0.275  1.0
  Ta  Ta3  1  0.820  0.456  0.749  1.0
  H  H4  1  0.620  0.880  0.620  1.0
  H  H5  1  0.463  0.044  0.246  1.0
  H  H6  1  0.246  0.247  0.463  1.0
  H  H7  1  0.370  0.630  0.370  1.0
  H  H8  1  0.003  0.004  0.206  1.0
  H  H9  1  0.206  0.787  0.003  1.0
  H  H10  1  0.230  0.270  0.230  1.0
  H  H11  1  0.980  0.020  0.980  1.0
  O  O12  1  0.046  0.757  0.717  1.0
  O  O13  1  0.717  0.480  0.046  1.0
  O  O14  1  0.074  0.426  0.074  1.0
  O  O15  1  0.706  0.794  0.706  1.0
  O  O16  1  0.647  0.881  0.110  1.0
  O  O17  1  0.110  0.362  0.647  1.0
  O  O18  1  0.493  0.204  0.770  1.0
  O  O19  1  0.770  0.533  0.493  1.0
  O  O20  1  0.456  0.544  0.456  1.0
  O  O21  1  0.824  0.176  0.824  1.0
  O  O22  1  0.888  0.140  0.369  1.0
  O  O23  1  0.369  0.603  0.888  1.0
  O  O24  1  0.318  0.182  0.318  1.0
  O  O25  1  0.068  0.932  0.068  1.0
[/CIF]
.
The crystal structure described by H4OTa2O6 crystallizes in the orthorhombic Fdd2 space group. Ta(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. In the second H site, H(2) is bonded in a linear geometry to one O(4) and one O(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Ta(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Ta(1) and one H(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one H(3) and two equivalent H(2) atoms. is represented by the CIF card [CIF]
data_Ta2H4O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.209
_cell_length_b   7.567
_cell_length_c   7.370
_cell_angle_alpha   66.665
_cell_angle_beta   57.818
_cell_angle_gamma   55.517
_symmetry_Int_Tables_number   1
_cell_volume   316.418
_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
  Ta  Ta0  1  0.275  0.501  0.794  1.0
  Ta  Ta1  1  0.749  0.975  0.820  1.0
  Ta  Ta2  1  0.794  0.430  0.275  1.0
  Ta  Ta3  1  0.820  0.456  0.749  1.0
  H  H4  1  0.620  0.880  0.620  1.0
  H  H5  1  0.463  0.044  0.246  1.0
  H  H6  1  0.246  0.247  0.463  1.0
  H  H7  1  0.370  0.630  0.370  1.0
  H  H8  1  0.003  0.004  0.206  1.0
  H  H9  1  0.206  0.787  0.003  1.0
  H  H10  1  0.230  0.270  0.230  1.0
  H  H11  1  0.980  0.020  0.980  1.0
  O  O12  1  0.046  0.757  0.717  1.0
  O  O13  1  0.717  0.480  0.046  1.0
  O  O14  1  0.074  0.426  0.074  1.0
  O  O15  1  0.706  0.794  0.706  1.0
  O  O16  1  0.647  0.881  0.110  1.0
  O  O17  1  0.110  0.362  0.647  1.0
  O  O18  1  0.493  0.204  0.770  1.0
  O  O19  1  0.770  0.533  0.493  1.0
  O  O20  1  0.456  0.544  0.456  1.0
  O  O21  1  0.824  0.176  0.824  1.0
  O  O22  1  0.888  0.140  0.369  1.0
  O  O23  1  0.369  0.603  0.888  1.0
  O  O24  1  0.318  0.182  0.318  1.0
  O  O25  1  0.068  0.932  0.068  1.0
[/CIF]
.