The material described by K2SiH4(NO)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 11-coordinate geometry to one N(1), one N(2), one H(1), one H(4), two equivalent H(3), two equivalent O(2), and three equivalent O(1) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one N(2), one H(1), one H(3), two equivalent H(2), two equivalent O(1), and two equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one N(1), one N(2), one O(1), and one O(2) atom. There are two inequivalent N sites. In the first N site, N(2) is bonded in a 3-coordinate geometry to one K(1), one K(2), one Si(1), one H(3), and one H(4) atom. In the second N site, N(1) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Si(1), one H(1), and one H(2) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one K(1), one K(2), and one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to two equivalent K(2) and one N(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one K(2), two equivalent K(1), and one N(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one K(1) and one N(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(2), three equivalent K(1), and one Si(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent K(1), two equivalent K(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_K2SiH4(NO)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.916
_cell_length_b   6.629
_cell_length_c   7.570
_cell_angle_alpha   89.055
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   497.497
_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
  K  K0  1  0.563  0.652  0.159  1.0
  K  K1  1  0.063  0.348  0.341  1.0
  K  K2  1  0.437  0.348  0.841  1.0
  K  K3  1  0.937  0.652  0.659  1.0
  K  K4  1  0.194  0.664  0.976  1.0
  K  K5  1  0.694  0.336  0.524  1.0
  K  K6  1  0.806  0.336  0.024  1.0
  K  K7  1  0.306  0.664  0.476  1.0
  Si  Si8  1  0.422  0.211  0.254  1.0
  Si  Si9  1  0.922  0.789  0.246  1.0
  Si  Si10  1  0.578  0.789  0.746  1.0
  Si  Si11  1  0.078  0.211  0.754  1.0
  H  H12  1  0.877  0.055  0.444  1.0
  H  H13  1  0.377  0.945  0.056  1.0
  H  H14  1  0.123  0.945  0.556  1.0
  H  H15  1  0.623  0.055  0.944  1.0
  H  H16  1  0.760  0.052  0.286  1.0
  H  H17  1  0.260  0.948  0.214  1.0
  H  H18  1  0.240  0.948  0.714  1.0
  H  H19  1  0.740  0.052  0.786  1.0
  H  H20  1  0.813  0.743  0.966  1.0
  H  H21  1  0.313  0.257  0.534  1.0
  H  H22  1  0.187  0.257  0.034  1.0
  H  H23  1  0.687  0.743  0.466  1.0
  H  H24  1  0.931  0.912  0.944  1.0
  H  H25  1  0.431  0.088  0.556  1.0
  H  H26  1  0.069  0.088  0.056  1.0
  H  H27  1  0.569  0.912  0.444  1.0
  N  N28  1  0.140  0.974  0.687  1.0
  N  N29  1  0.640  0.026  0.813  1.0
  N  N30  1  0.860  0.026  0.313  1.0
  N  N31  1  0.360  0.974  0.187  1.0
  N  N32  1  0.905  0.785  0.014  1.0
  N  N33  1  0.405  0.215  0.486  1.0
  N  N34  1  0.095  0.215  0.986  1.0
  N  N35  1  0.595  0.785  0.514  1.0
  O  O36  1  0.833  0.602  0.319  1.0
  O  O37  1  0.333  0.398  0.181  1.0
  O  O38  1  0.167  0.398  0.681  1.0
  O  O39  1  0.667  0.602  0.819  1.0
  O  O40  1  0.079  0.781  0.301  1.0
  O  O41  1  0.579  0.219  0.199  1.0
  O  O42  1  0.921  0.219  0.699  1.0
  O  O43  1  0.421  0.781  0.801  1.0
[/CIF]
.
The material described by K2SiH4(NO)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 11-coordinate geometry to one N(1), one N(2), one H(1), one H(4), two equivalent H(3), two equivalent O(2), and three equivalent O(1) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one N(2), one H(1), one H(3), two equivalent H(2), two equivalent O(1), and two equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one N(1), one N(2), one O(1), and one O(2) atom. There are two inequivalent N sites. In the first N site, N(2) is bonded in a 3-coordinate geometry to one K(1), one K(2), one Si(1), one H(3), and one H(4) atom. In the second N site, N(1) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Si(1), one H(1), and one H(2) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one K(1), one K(2), and one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to two equivalent K(2) and one N(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one K(2), two equivalent K(1), and one N(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one K(1) and one N(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(2), three equivalent K(1), and one Si(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent K(1), two equivalent K(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_K2SiH4(NO)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.916
_cell_length_b   6.629
_cell_length_c   7.570
_cell_angle_alpha   89.055
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   497.497
_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
  K  K0  1  0.563  0.652  0.159  1.0
  K  K1  1  0.063  0.348  0.341  1.0
  K  K2  1  0.437  0.348  0.841  1.0
  K  K3  1  0.937  0.652  0.659  1.0
  K  K4  1  0.194  0.664  0.976  1.0
  K  K5  1  0.694  0.336  0.524  1.0
  K  K6  1  0.806  0.336  0.024  1.0
  K  K7  1  0.306  0.664  0.476  1.0
  Si  Si8  1  0.422  0.211  0.254  1.0
  Si  Si9  1  0.922  0.789  0.246  1.0
  Si  Si10  1  0.578  0.789  0.746  1.0
  Si  Si11  1  0.078  0.211  0.754  1.0
  H  H12  1  0.877  0.055  0.444  1.0
  H  H13  1  0.377  0.945  0.056  1.0
  H  H14  1  0.123  0.945  0.556  1.0
  H  H15  1  0.623  0.055  0.944  1.0
  H  H16  1  0.760  0.052  0.286  1.0
  H  H17  1  0.260  0.948  0.214  1.0
  H  H18  1  0.240  0.948  0.714  1.0
  H  H19  1  0.740  0.052  0.786  1.0
  H  H20  1  0.813  0.743  0.966  1.0
  H  H21  1  0.313  0.257  0.534  1.0
  H  H22  1  0.187  0.257  0.034  1.0
  H  H23  1  0.687  0.743  0.466  1.0
  H  H24  1  0.931  0.912  0.944  1.0
  H  H25  1  0.431  0.088  0.556  1.0
  H  H26  1  0.069  0.088  0.056  1.0
  H  H27  1  0.569  0.912  0.444  1.0
  N  N28  1  0.140  0.974  0.687  1.0
  N  N29  1  0.640  0.026  0.813  1.0
  N  N30  1  0.860  0.026  0.313  1.0
  N  N31  1  0.360  0.974  0.187  1.0
  N  N32  1  0.905  0.785  0.014  1.0
  N  N33  1  0.405  0.215  0.486  1.0
  N  N34  1  0.095  0.215  0.986  1.0
  N  N35  1  0.595  0.785  0.514  1.0
  O  O36  1  0.833  0.602  0.319  1.0
  O  O37  1  0.333  0.398  0.181  1.0
  O  O38  1  0.167  0.398  0.681  1.0
  O  O39  1  0.667  0.602  0.819  1.0
  O  O40  1  0.079  0.781  0.301  1.0
  O  O41  1  0.579  0.219  0.199  1.0
  O  O42  1  0.921  0.219  0.699  1.0
  O  O43  1  0.421  0.781  0.801  1.0
[/CIF]
.