The crystal structure described by Na4H6Se2O11 crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), and two equivalent O(5) atoms. In the second Na site, Na(2) is bonded to one O(1), one O(4), one O(6), and two equivalent O(2) atoms to form distorted NaO5 trigonal bipyramids that share corners with four equivalent Se(1)O4 tetrahedra and corners with three equivalent Na(2)O5 trigonal bipyramids. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one O(1) and one O(6) atom. Se(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SeO4 tetrahedra that share corners with four equivalent Na(2)O5 trigonal bipyramids. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one H(3), and one Se(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), two equivalent Na(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to two equivalent Na(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to two equivalent Na(1), one H(1), and one H(2) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to two equivalent Na(2) and two equivalent H(3) atoms. is represented by the CIF file [CIF]
data_Na4H6Se2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.584
_cell_length_b   5.584
_cell_length_c   18.298
_cell_angle_alpha   96.746
_cell_angle_beta   96.746
_cell_angle_gamma   103.304
_symmetry_Int_Tables_number   1
_cell_volume   545.102
_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
  Na  Na0  1  0.052  0.373  0.809  1.0
  Na  Na1  1  0.564  0.244  0.191  1.0
  Na  Na2  1  0.494  0.314  0.691  1.0
  Na  Na3  1  0.623  0.802  0.309  1.0
  Na  Na4  1  0.308  0.894  0.995  1.0
  Na  Na5  1  0.899  0.314  0.005  1.0
  Na  Na6  1  0.564  0.649  0.505  1.0
  Na  Na7  1  0.144  0.058  0.495  1.0
  H  H8  1  0.470  0.095  0.829  1.0
  H  H9  1  0.266  0.642  0.171  1.0
  H  H10  1  0.892  0.016  0.671  1.0
  H  H11  1  0.345  0.220  0.329  1.0
  H  H12  1  0.266  0.920  0.768  1.0
  H  H13  1  0.152  0.498  0.232  1.0
  H  H14  1  0.748  0.902  0.732  1.0
  H  H15  1  0.170  0.016  0.268  1.0
  H  H16  1  0.464  0.415  0.042  1.0
  H  H17  1  0.373  0.422  0.958  1.0
  H  H18  1  0.672  0.123  0.458  1.0
  H  H19  1  0.665  0.214  0.542  1.0
  Se  Se20  1  0.714  0.740  0.877  1.0
  Se  Se21  1  0.863  0.837  0.123  1.0
  Se  Se22  1  0.087  0.613  0.623  1.0
  Se  Se23  1  0.990  0.464  0.377  1.0
  O  O24  1  0.424  0.624  0.895  1.0
  O  O25  1  0.729  0.529  0.105  1.0
  O  O26  1  0.779  0.479  0.605  1.0
  O  O27  1  0.874  0.174  0.395  1.0
  O  O28  1  0.919  0.649  0.935  1.0
  O  O29  1  0.714  0.984  0.065  1.0
  O  O30  1  0.234  0.464  0.565  1.0
  O  O31  1  0.899  0.669  0.435  1.0
  O  O32  1  0.745  0.636  0.790  1.0
  O  O33  1  0.846  0.955  0.210  1.0
  O  O34  1  0.205  0.596  0.710  1.0
  O  O35  1  0.886  0.495  0.290  1.0
  O  O36  1  0.762  0.051  0.888  1.0
  O  O37  1  0.163  0.874  0.112  1.0
  O  O38  1  0.124  0.913  0.612  1.0
  O  O39  1  0.301  0.512  0.388  1.0
  O  O40  1  0.322  0.094  0.793  1.0
  O  O41  1  0.300  0.529  0.207  1.0
  O  O42  1  0.779  0.050  0.707  1.0
  O  O43  1  0.344  0.072  0.293  1.0
  O  O44  1  0.329  0.329  0.000  1.0
  O  O45  1  0.579  0.079  0.500  1.0
[/CIF]
.
The crystal structure described by Na4H6Se2O11 crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), and two equivalent O(5) atoms. In the second Na site, Na(2) is bonded to one O(1), one O(4), one O(6), and two equivalent O(2) atoms to form distorted NaO5 trigonal bipyramids that share corners with four equivalent Se(1)O4 tetrahedra and corners with three equivalent Na(2)O5 trigonal bipyramids. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one O(1) and one O(6) atom. Se(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SeO4 tetrahedra that share corners with four equivalent Na(2)O5 trigonal bipyramids. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one H(3), and one Se(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), two equivalent Na(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to two equivalent Na(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to two equivalent Na(1), one H(1), and one H(2) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to two equivalent Na(2) and two equivalent H(3) atoms. is represented by the CIF file [CIF]
data_Na4H6Se2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.584
_cell_length_b   5.584
_cell_length_c   18.298
_cell_angle_alpha   96.746
_cell_angle_beta   96.746
_cell_angle_gamma   103.304
_symmetry_Int_Tables_number   1
_cell_volume   545.102
_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
  Na  Na0  1  0.052  0.373  0.809  1.0
  Na  Na1  1  0.564  0.244  0.191  1.0
  Na  Na2  1  0.494  0.314  0.691  1.0
  Na  Na3  1  0.623  0.802  0.309  1.0
  Na  Na4  1  0.308  0.894  0.995  1.0
  Na  Na5  1  0.899  0.314  0.005  1.0
  Na  Na6  1  0.564  0.649  0.505  1.0
  Na  Na7  1  0.144  0.058  0.495  1.0
  H  H8  1  0.470  0.095  0.829  1.0
  H  H9  1  0.266  0.642  0.171  1.0
  H  H10  1  0.892  0.016  0.671  1.0
  H  H11  1  0.345  0.220  0.329  1.0
  H  H12  1  0.266  0.920  0.768  1.0
  H  H13  1  0.152  0.498  0.232  1.0
  H  H14  1  0.748  0.902  0.732  1.0
  H  H15  1  0.170  0.016  0.268  1.0
  H  H16  1  0.464  0.415  0.042  1.0
  H  H17  1  0.373  0.422  0.958  1.0
  H  H18  1  0.672  0.123  0.458  1.0
  H  H19  1  0.665  0.214  0.542  1.0
  Se  Se20  1  0.714  0.740  0.877  1.0
  Se  Se21  1  0.863  0.837  0.123  1.0
  Se  Se22  1  0.087  0.613  0.623  1.0
  Se  Se23  1  0.990  0.464  0.377  1.0
  O  O24  1  0.424  0.624  0.895  1.0
  O  O25  1  0.729  0.529  0.105  1.0
  O  O26  1  0.779  0.479  0.605  1.0
  O  O27  1  0.874  0.174  0.395  1.0
  O  O28  1  0.919  0.649  0.935  1.0
  O  O29  1  0.714  0.984  0.065  1.0
  O  O30  1  0.234  0.464  0.565  1.0
  O  O31  1  0.899  0.669  0.435  1.0
  O  O32  1  0.745  0.636  0.790  1.0
  O  O33  1  0.846  0.955  0.210  1.0
  O  O34  1  0.205  0.596  0.710  1.0
  O  O35  1  0.886  0.495  0.290  1.0
  O  O36  1  0.762  0.051  0.888  1.0
  O  O37  1  0.163  0.874  0.112  1.0
  O  O38  1  0.124  0.913  0.612  1.0
  O  O39  1  0.301  0.512  0.388  1.0
  O  O40  1  0.322  0.094  0.793  1.0
  O  O41  1  0.300  0.529  0.207  1.0
  O  O42  1  0.779  0.050  0.707  1.0
  O  O43  1  0.344  0.072  0.293  1.0
  O  O44  1  0.329  0.329  0.000  1.0
  O  O45  1  0.579  0.079  0.500  1.0
[/CIF]
.