The compound described by H2W2O7 crystallizes in the orthorhombic Ima2 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. In the second W site, W(2) is bonded to one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form corner-sharing WO7 pentagonal bipyramids. There are two 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 single-bond geometry to one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one W(1) and one W(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to two equivalent W(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent W(2) and one H(2) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one W(2) and two equivalent W(1) atoms. is represented by the CIF file [CIF]
data_H2W2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.133
_cell_length_b   7.133
_cell_length_c   7.133
_cell_angle_alpha   119.453
_cell_angle_beta   115.865
_cell_angle_gamma   94.131
_symmetry_Int_Tables_number   1
_cell_volume   264.631
_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  0.985  0.572  0.913  1.0
  H  H1  1  0.446  0.193  0.754  1.0
  H  H2  1  0.341  0.428  0.413  1.0
  H  H3  1  0.561  0.807  0.254  1.0
  W  W4  1  0.992  0.500  0.492  1.0
  W  W5  1  0.009  0.985  0.524  1.0
  W  W6  1  0.539  0.015  0.024  1.0
  W  W7  1  0.992  0.000  0.992  1.0
  O  O8  1  0.296  0.040  0.086  1.0
  O  O9  1  0.002  0.668  0.330  1.0
  O  O10  1  0.002  0.172  0.834  1.0
  O  O11  1  0.296  0.710  0.756  1.0
  O  O12  1  0.971  0.646  0.825  1.0
  O  O13  1  0.357  0.093  0.765  1.0
  O  O14  1  0.662  0.828  0.830  1.0
  O  O15  1  0.046  0.290  0.586  1.0
  O  O16  1  0.046  0.960  0.256  1.0
  O  O17  1  0.662  0.332  0.334  1.0
  O  O18  1  0.180  0.354  0.325  1.0
  O  O19  1  0.672  0.907  0.265  1.0
  O  O20  1  0.880  0.784  0.596  1.0
  O  O21  1  0.812  0.216  0.096  1.0
[/CIF]
.
The compound described by H2W2O7 crystallizes in the orthorhombic Ima2 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. In the second W site, W(2) is bonded to one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form corner-sharing WO7 pentagonal bipyramids. There are two 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 single-bond geometry to one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one W(1) and one W(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to two equivalent W(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent W(2) and one H(2) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one W(2) and two equivalent W(1) atoms. is represented by the CIF file [CIF]
data_H2W2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.133
_cell_length_b   7.133
_cell_length_c   7.133
_cell_angle_alpha   119.453
_cell_angle_beta   115.865
_cell_angle_gamma   94.131
_symmetry_Int_Tables_number   1
_cell_volume   264.631
_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  0.985  0.572  0.913  1.0
  H  H1  1  0.446  0.193  0.754  1.0
  H  H2  1  0.341  0.428  0.413  1.0
  H  H3  1  0.561  0.807  0.254  1.0
  W  W4  1  0.992  0.500  0.492  1.0
  W  W5  1  0.009  0.985  0.524  1.0
  W  W6  1  0.539  0.015  0.024  1.0
  W  W7  1  0.992  0.000  0.992  1.0
  O  O8  1  0.296  0.040  0.086  1.0
  O  O9  1  0.002  0.668  0.330  1.0
  O  O10  1  0.002  0.172  0.834  1.0
  O  O11  1  0.296  0.710  0.756  1.0
  O  O12  1  0.971  0.646  0.825  1.0
  O  O13  1  0.357  0.093  0.765  1.0
  O  O14  1  0.662  0.828  0.830  1.0
  O  O15  1  0.046  0.290  0.586  1.0
  O  O16  1  0.046  0.960  0.256  1.0
  O  O17  1  0.662  0.332  0.334  1.0
  O  O18  1  0.180  0.354  0.325  1.0
  O  O19  1  0.672  0.907  0.265  1.0
  O  O20  1  0.880  0.784  0.596  1.0
  O  O21  1  0.812  0.216  0.096  1.0
[/CIF]
.