The compound described by Na2ZnH4(SeO5)2 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with four equivalent Se(1)O4 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) and one O(5) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) and one O(5) 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 two equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Zn(1), and one Se(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Na(1), one Zn(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one H(1), one H(2), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Zn(1), one H(1), and one H(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2ZnH4(SeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.553
_cell_length_b   5.909
_cell_length_c   7.113
_cell_angle_alpha   108.164
_cell_angle_beta   98.820
_cell_angle_gamma   107.827
_symmetry_Int_Tables_number   1
_cell_volume   202.979
_cell_formula_units_Z   1
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  0.340  0.719  0.247  1.0
  Na  Na1  1  0.660  0.281  0.753  1.0
  Zn  Zn2  1  0.000  0.000  0.000  1.0
  H  H3  1  0.855  0.874  0.608  1.0
  H  H4  1  0.145  0.126  0.392  1.0
  H  H5  1  0.081  0.152  0.701  1.0
  H  H6  1  0.919  0.848  0.299  1.0
  Se  Se7  1  0.329  0.661  0.760  1.0
  Se  Se8  1  0.671  0.339  0.240  1.0
  O  O9  1  0.082  0.656  0.867  1.0
  O  O10  1  0.918  0.344  0.133  1.0
  O  O11  1  0.602  0.769  0.951  1.0
  O  O12  1  0.398  0.231  0.049  1.0
  O  O13  1  0.348  0.828  0.614  1.0
  O  O14  1  0.652  0.172  0.386  1.0
  O  O15  1  0.286  0.359  0.627  1.0
  O  O16  1  0.714  0.641  0.373  1.0
  O  O17  1  0.929  0.039  0.728  1.0
  O  O18  1  0.071  0.961  0.272  1.0
[/CIF]
.
The compound described by Na2ZnH4(SeO5)2 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with four equivalent Se(1)O4 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) and one O(5) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) and one O(5) 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 two equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Zn(1), and one Se(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Na(1), one Zn(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one H(1), one H(2), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Zn(1), one H(1), and one H(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2ZnH4(SeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.553
_cell_length_b   5.909
_cell_length_c   7.113
_cell_angle_alpha   108.164
_cell_angle_beta   98.820
_cell_angle_gamma   107.827
_symmetry_Int_Tables_number   1
_cell_volume   202.979
_cell_formula_units_Z   1
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  0.340  0.719  0.247  1.0
  Na  Na1  1  0.660  0.281  0.753  1.0
  Zn  Zn2  1  0.000  0.000  0.000  1.0
  H  H3  1  0.855  0.874  0.608  1.0
  H  H4  1  0.145  0.126  0.392  1.0
  H  H5  1  0.081  0.152  0.701  1.0
  H  H6  1  0.919  0.848  0.299  1.0
  Se  Se7  1  0.329  0.661  0.760  1.0
  Se  Se8  1  0.671  0.339  0.240  1.0
  O  O9  1  0.082  0.656  0.867  1.0
  O  O10  1  0.918  0.344  0.133  1.0
  O  O11  1  0.602  0.769  0.951  1.0
  O  O12  1  0.398  0.231  0.049  1.0
  O  O13  1  0.348  0.828  0.614  1.0
  O  O14  1  0.652  0.172  0.386  1.0
  O  O15  1  0.286  0.359  0.627  1.0
  O  O16  1  0.714  0.641  0.373  1.0
  O  O17  1  0.929  0.039  0.728  1.0
  O  O18  1  0.071  0.961  0.272  1.0
[/CIF]
.