The material described by Na3OsH7 crystallizes in the tetragonal P4_2/mnm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one H(4), two equivalent H(1), two equivalent H(2), and three equivalent H(3) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent H(2), two equivalent H(3), and four equivalent H(1) atoms. Os(1) is bonded in a pentagonal bipyramidal geometry to one H(4), two equivalent H(1), two equivalent H(2), and two equivalent H(3) atoms. There are four inequivalent H sites. In the first H site, H(4) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one Os(1) atom. In the second H site, H(1) is bonded to two equivalent Na(1), two equivalent Na(2), and one Os(1) atom to form distorted HNa4Os square pyramids that share corners with five equivalent H(2)Na3Os tetrahedra, edges with three equivalent H(1)Na4Os square pyramids,  an edgeedge with one H(2)Na3Os tetrahedra,  a faceface with one H(1)Na4Os square pyramid, and  a faceface with one H(2)Na3Os tetrahedra. In the third H site, H(2) is bonded to one Na(2), two equivalent Na(1), and one Os(1) atom to form distorted HNa3Os tetrahedra that share corners with five equivalent H(1)Na4Os square pyramids,  a cornercorner with one H(2)Na3Os tetrahedra,  an edgeedge with one H(1)Na4Os square pyramid,  a faceface with one H(1)Na4Os square pyramid, and  a faceface with one H(2)Na3Os tetrahedra. In the fourth H site, H(3) is bonded in a 5-coordinate geometry to one Na(2), three equivalent Na(1), and one Os(1) atom. is represented by the CIF file [CIF]
data_Na3H7Os
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.493
_cell_length_b   9.493
_cell_length_c   5.230
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   471.306
_cell_formula_units_Z   4
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  0.700  0.966  0.500  1.0
  Na  Na1  1  0.300  0.034  0.500  1.0
  Na  Na2  1  0.200  0.534  0.000  1.0
  Na  Na3  1  0.800  0.466  0.000  1.0
  Na  Na4  1  0.966  0.700  0.500  1.0
  Na  Na5  1  0.034  0.300  0.500  1.0
  Na  Na6  1  0.534  0.200  0.000  1.0
  Na  Na7  1  0.466  0.800  0.000  1.0
  Na  Na8  1  0.383  0.383  0.500  1.0
  Na  Na9  1  0.617  0.617  0.500  1.0
  Na  Na10  1  0.883  0.117  0.000  1.0
  Na  Na11  1  0.117  0.883  0.000  1.0
  H  H12  1  0.603  0.397  0.698  1.0
  H  H13  1  0.397  0.603  0.698  1.0
  H  H14  1  0.103  0.103  0.198  1.0
  H  H15  1  0.897  0.897  0.198  1.0
  H  H16  1  0.397  0.603  0.302  1.0
  H  H17  1  0.603  0.397  0.302  1.0
  H  H18  1  0.897  0.897  0.802  1.0
  H  H19  1  0.103  0.103  0.802  1.0
  H  H20  1  0.742  0.258  0.202  1.0
  H  H21  1  0.258  0.742  0.202  1.0
  H  H22  1  0.242  0.242  0.702  1.0
  H  H23  1  0.758  0.758  0.702  1.0
  H  H24  1  0.258  0.742  0.798  1.0
  H  H25  1  0.742  0.258  0.798  1.0
  H  H26  1  0.758  0.758  0.298  1.0
  H  H27  1  0.242  0.242  0.298  1.0
  H  H28  1  0.569  0.174  0.500  1.0
  H  H29  1  0.431  0.826  0.500  1.0
  H  H30  1  0.069  0.326  0.000  1.0
  H  H31  1  0.931  0.674  0.000  1.0
  H  H32  1  0.174  0.569  0.500  1.0
  H  H33  1  0.826  0.431  0.500  1.0
  H  H34  1  0.326  0.069  0.000  1.0
  H  H35  1  0.674  0.931  0.000  1.0
  H  H36  1  0.826  0.174  0.500  1.0
  H  H37  1  0.174  0.826  0.500  1.0
  H  H38  1  0.326  0.326  0.000  1.0
  H  H39  1  0.674  0.674  0.000  1.0
  Os  Os40  1  0.702  0.298  0.500  1.0
  Os  Os41  1  0.298  0.702  0.500  1.0
  Os  Os42  1  0.202  0.202  0.000  1.0
  Os  Os43  1  0.798  0.798  0.000  1.0
[/CIF]
.
The material described by Na3OsH7 crystallizes in the tetragonal P4_2/mnm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one H(4), two equivalent H(1), two equivalent H(2), and three equivalent H(3) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent H(2), two equivalent H(3), and four equivalent H(1) atoms. Os(1) is bonded in a pentagonal bipyramidal geometry to one H(4), two equivalent H(1), two equivalent H(2), and two equivalent H(3) atoms. There are four inequivalent H sites. In the first H site, H(4) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one Os(1) atom. In the second H site, H(1) is bonded to two equivalent Na(1), two equivalent Na(2), and one Os(1) atom to form distorted HNa4Os square pyramids that share corners with five equivalent H(2)Na3Os tetrahedra, edges with three equivalent H(1)Na4Os square pyramids,  an edgeedge with one H(2)Na3Os tetrahedra,  a faceface with one H(1)Na4Os square pyramid, and  a faceface with one H(2)Na3Os tetrahedra. In the third H site, H(2) is bonded to one Na(2), two equivalent Na(1), and one Os(1) atom to form distorted HNa3Os tetrahedra that share corners with five equivalent H(1)Na4Os square pyramids,  a cornercorner with one H(2)Na3Os tetrahedra,  an edgeedge with one H(1)Na4Os square pyramid,  a faceface with one H(1)Na4Os square pyramid, and  a faceface with one H(2)Na3Os tetrahedra. In the fourth H site, H(3) is bonded in a 5-coordinate geometry to one Na(2), three equivalent Na(1), and one Os(1) atom. is represented by the CIF file [CIF]
data_Na3H7Os
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.493
_cell_length_b   9.493
_cell_length_c   5.230
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   471.306
_cell_formula_units_Z   4
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  0.700  0.966  0.500  1.0
  Na  Na1  1  0.300  0.034  0.500  1.0
  Na  Na2  1  0.200  0.534  0.000  1.0
  Na  Na3  1  0.800  0.466  0.000  1.0
  Na  Na4  1  0.966  0.700  0.500  1.0
  Na  Na5  1  0.034  0.300  0.500  1.0
  Na  Na6  1  0.534  0.200  0.000  1.0
  Na  Na7  1  0.466  0.800  0.000  1.0
  Na  Na8  1  0.383  0.383  0.500  1.0
  Na  Na9  1  0.617  0.617  0.500  1.0
  Na  Na10  1  0.883  0.117  0.000  1.0
  Na  Na11  1  0.117  0.883  0.000  1.0
  H  H12  1  0.603  0.397  0.698  1.0
  H  H13  1  0.397  0.603  0.698  1.0
  H  H14  1  0.103  0.103  0.198  1.0
  H  H15  1  0.897  0.897  0.198  1.0
  H  H16  1  0.397  0.603  0.302  1.0
  H  H17  1  0.603  0.397  0.302  1.0
  H  H18  1  0.897  0.897  0.802  1.0
  H  H19  1  0.103  0.103  0.802  1.0
  H  H20  1  0.742  0.258  0.202  1.0
  H  H21  1  0.258  0.742  0.202  1.0
  H  H22  1  0.242  0.242  0.702  1.0
  H  H23  1  0.758  0.758  0.702  1.0
  H  H24  1  0.258  0.742  0.798  1.0
  H  H25  1  0.742  0.258  0.798  1.0
  H  H26  1  0.758  0.758  0.298  1.0
  H  H27  1  0.242  0.242  0.298  1.0
  H  H28  1  0.569  0.174  0.500  1.0
  H  H29  1  0.431  0.826  0.500  1.0
  H  H30  1  0.069  0.326  0.000  1.0
  H  H31  1  0.931  0.674  0.000  1.0
  H  H32  1  0.174  0.569  0.500  1.0
  H  H33  1  0.826  0.431  0.500  1.0
  H  H34  1  0.326  0.069  0.000  1.0
  H  H35  1  0.674  0.931  0.000  1.0
  H  H36  1  0.826  0.174  0.500  1.0
  H  H37  1  0.174  0.826  0.500  1.0
  H  H38  1  0.326  0.326  0.000  1.0
  H  H39  1  0.674  0.674  0.000  1.0
  Os  Os40  1  0.702  0.298  0.500  1.0
  Os  Os41  1  0.298  0.702  0.500  1.0
  Os  Os42  1  0.202  0.202  0.000  1.0
  Os  Os43  1  0.798  0.798  0.000  1.0
[/CIF]
.