The structure described by Na2FeH8(SO6)2 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded to one O(3), one O(4), one O(5), one O(6), and two equivalent O(2) atoms to form distorted NaO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent S(1)O4 tetrahedra, and  an edgeedge with one Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-67°. Fe(1) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Na(1)O6 octahedra and corners with two equivalent S(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-67°. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) and one O(5) atom. In the second H site, H(2) is bonded in a single-bond 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(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra and corners with four equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-61°. There are six inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one H(1), and one S(1) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one H(2), and one S(1) atom. In the third O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Fe(1), one H(1), and one H(2) atom. In the fourth O site, O(6) is bonded in a distorted water-like geometry to one Na(1), one Fe(1), one H(3), and one H(4) atom. In the fifth O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one S(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2FeH8(SO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.279
_cell_length_b   5.615
_cell_length_c   11.345
_cell_angle_alpha   79.610
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   518.743
_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  0.070  0.369  0.362  1.0
  Na  Na1  1  0.570  0.631  0.138  1.0
  Na  Na2  1  0.930  0.631  0.638  1.0
  Na  Na3  1  0.430  0.369  0.862  1.0
  Fe  Fe4  1  0.000  0.500  0.000  1.0
  Fe  Fe5  1  0.500  0.500  0.500  1.0
  H  H6  1  0.140  0.726  0.159  1.0
  H  H7  1  0.640  0.274  0.341  1.0
  H  H8  1  0.860  0.274  0.841  1.0
  H  H9  1  0.360  0.726  0.659  1.0
  H  H10  1  0.948  0.729  0.186  1.0
  H  H11  1  0.448  0.271  0.314  1.0
  H  H12  1  0.052  0.271  0.814  1.0
  H  H13  1  0.552  0.729  0.686  1.0
  H  H14  1  0.201  0.821  0.851  1.0
  H  H15  1  0.701  0.179  0.649  1.0
  H  H16  1  0.799  0.179  0.149  1.0
  H  H17  1  0.299  0.821  0.351  1.0
  H  H18  1  0.285  0.737  0.974  1.0
  H  H19  1  0.785  0.263  0.526  1.0
  H  H20  1  0.715  0.263  0.026  1.0
  H  H21  1  0.215  0.737  0.474  1.0
  S  S22  1  0.288  0.127  0.135  1.0
  S  S23  1  0.788  0.873  0.365  1.0
  S  S24  1  0.712  0.873  0.865  1.0
  S  S25  1  0.212  0.127  0.635  1.0
  O  O26  1  0.129  0.187  0.073  1.0
  O  O27  1  0.629  0.813  0.427  1.0
  O  O28  1  0.871  0.813  0.927  1.0
  O  O29  1  0.371  0.187  0.573  1.0
  O  O30  1  0.416  0.288  0.076  1.0
  O  O31  1  0.916  0.712  0.424  1.0
  O  O32  1  0.584  0.712  0.924  1.0
  O  O33  1  0.084  0.288  0.576  1.0
  O  O34  1  0.323  0.866  0.128  1.0
  O  O35  1  0.823  0.134  0.372  1.0
  O  O36  1  0.677  0.134  0.872  1.0
  O  O37  1  0.177  0.866  0.628  1.0
  O  O38  1  0.274  0.146  0.265  1.0
  O  O39  1  0.774  0.854  0.235  1.0
  O  O40  1  0.726  0.854  0.735  1.0
  O  O41  1  0.226  0.146  0.765  1.0
  O  O42  1  0.039  0.627  0.166  1.0
  O  O43  1  0.539  0.373  0.334  1.0
  O  O44  1  0.961  0.373  0.834  1.0
  O  O45  1  0.461  0.627  0.666  1.0
  O  O46  1  0.221  0.675  0.913  1.0
  O  O47  1  0.721  0.325  0.587  1.0
  O  O48  1  0.779  0.325  0.087  1.0
  O  O49  1  0.279  0.675  0.413  1.0
[/CIF]
.
The structure described by Na2FeH8(SO6)2 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded to one O(3), one O(4), one O(5), one O(6), and two equivalent O(2) atoms to form distorted NaO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent S(1)O4 tetrahedra, and  an edgeedge with one Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-67°. Fe(1) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Na(1)O6 octahedra and corners with two equivalent S(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-67°. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) and one O(5) atom. In the second H site, H(2) is bonded in a single-bond 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(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra and corners with four equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-61°. There are six inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one H(1), and one S(1) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one H(2), and one S(1) atom. In the third O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Fe(1), one H(1), and one H(2) atom. In the fourth O site, O(6) is bonded in a distorted water-like geometry to one Na(1), one Fe(1), one H(3), and one H(4) atom. In the fifth O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one S(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2FeH8(SO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.279
_cell_length_b   5.615
_cell_length_c   11.345
_cell_angle_alpha   79.610
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   518.743
_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  0.070  0.369  0.362  1.0
  Na  Na1  1  0.570  0.631  0.138  1.0
  Na  Na2  1  0.930  0.631  0.638  1.0
  Na  Na3  1  0.430  0.369  0.862  1.0
  Fe  Fe4  1  0.000  0.500  0.000  1.0
  Fe  Fe5  1  0.500  0.500  0.500  1.0
  H  H6  1  0.140  0.726  0.159  1.0
  H  H7  1  0.640  0.274  0.341  1.0
  H  H8  1  0.860  0.274  0.841  1.0
  H  H9  1  0.360  0.726  0.659  1.0
  H  H10  1  0.948  0.729  0.186  1.0
  H  H11  1  0.448  0.271  0.314  1.0
  H  H12  1  0.052  0.271  0.814  1.0
  H  H13  1  0.552  0.729  0.686  1.0
  H  H14  1  0.201  0.821  0.851  1.0
  H  H15  1  0.701  0.179  0.649  1.0
  H  H16  1  0.799  0.179  0.149  1.0
  H  H17  1  0.299  0.821  0.351  1.0
  H  H18  1  0.285  0.737  0.974  1.0
  H  H19  1  0.785  0.263  0.526  1.0
  H  H20  1  0.715  0.263  0.026  1.0
  H  H21  1  0.215  0.737  0.474  1.0
  S  S22  1  0.288  0.127  0.135  1.0
  S  S23  1  0.788  0.873  0.365  1.0
  S  S24  1  0.712  0.873  0.865  1.0
  S  S25  1  0.212  0.127  0.635  1.0
  O  O26  1  0.129  0.187  0.073  1.0
  O  O27  1  0.629  0.813  0.427  1.0
  O  O28  1  0.871  0.813  0.927  1.0
  O  O29  1  0.371  0.187  0.573  1.0
  O  O30  1  0.416  0.288  0.076  1.0
  O  O31  1  0.916  0.712  0.424  1.0
  O  O32  1  0.584  0.712  0.924  1.0
  O  O33  1  0.084  0.288  0.576  1.0
  O  O34  1  0.323  0.866  0.128  1.0
  O  O35  1  0.823  0.134  0.372  1.0
  O  O36  1  0.677  0.134  0.872  1.0
  O  O37  1  0.177  0.866  0.628  1.0
  O  O38  1  0.274  0.146  0.265  1.0
  O  O39  1  0.774  0.854  0.235  1.0
  O  O40  1  0.726  0.854  0.735  1.0
  O  O41  1  0.226  0.146  0.765  1.0
  O  O42  1  0.039  0.627  0.166  1.0
  O  O43  1  0.539  0.373  0.334  1.0
  O  O44  1  0.961  0.373  0.834  1.0
  O  O45  1  0.461  0.627  0.666  1.0
  O  O46  1  0.221  0.675  0.913  1.0
  O  O47  1  0.721  0.325  0.587  1.0
  O  O48  1  0.779  0.325  0.087  1.0
  O  O49  1  0.279  0.675  0.413  1.0
[/CIF]
.