The crystal structure described by Si2N2O is beta indium sulfide-derived structured and crystallizes in the tetragonal I4_1/amd space group. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), three equivalent N(2), and two equivalent O(1) atoms to form SiN4O2 octahedra that share corners with four equivalent Si(2)N4 tetrahedra, edges with two equivalent Si(3)N4O2 octahedra, and edges with four equivalent Si(1)N4O2 octahedra. In the second Si site, Si(2) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form corner-sharing SiN4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-58°. In the third Si site, Si(3) is bonded to four equivalent N(1) and two equivalent O(1) atoms to form SiN4O2 octahedra that share corners with four equivalent Si(2)N4 tetrahedra, edges with two equivalent Si(3)N4O2 octahedra, and edges with four equivalent Si(1)N4O2 octahedra. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted rectangular see-saw-like geometry to one Si(1), one Si(2), and two equivalent Si(3) atoms. In the second N site, N(2) is bonded to one Si(2) and three equivalent Si(1) atoms to form a mixture of distorted corner and edge-sharing NSi4 trigonal pyramids. O(1) is bonded in a distorted trigonal non-coplanar geometry to one Si(3) and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Si2N2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.312
_cell_length_b   12.312
_cell_length_c   12.312
_cell_angle_alpha   154.214
_cell_angle_beta   154.214
_cell_angle_gamma   36.789
_symmetry_Int_Tables_number   1
_cell_volume   352.706
_cell_formula_units_Z   8
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
  Si  Si0  1  0.707  0.957  0.250  1.0
  Si  Si1  1  0.543  0.293  0.250  1.0
  Si  Si2  1  0.043  0.293  0.750  1.0
  Si  Si3  1  0.043  0.793  0.750  1.0
  Si  Si4  1  0.043  0.293  0.250  1.0
  Si  Si5  1  0.707  0.957  0.750  1.0
  Si  Si6  1  0.207  0.957  0.250  1.0
  Si  Si7  1  0.707  0.457  0.750  1.0
  Si  Si8  1  0.919  0.419  0.500  1.0
  Si  Si9  1  0.169  0.169  0.000  1.0
  Si  Si10  1  0.831  0.831  0.000  1.0
  Si  Si11  1  0.581  0.081  0.500  1.0
  Si  Si12  1  0.375  0.625  0.250  1.0
  Si  Si13  1  0.375  0.625  0.750  1.0
  Si  Si14  1  0.875  0.625  0.250  1.0
  Si  Si15  1  0.375  0.125  0.750  1.0
  N  N16  1  0.125  0.387  0.263  1.0
  N  N17  1  0.137  0.375  0.763  1.0
  N  N18  1  0.612  0.375  0.237  1.0
  N  N19  1  0.625  0.388  0.763  1.0
  N  N20  1  0.125  0.862  0.737  1.0
  N  N21  1  0.138  0.875  0.263  1.0
  N  N22  1  0.613  0.875  0.737  1.0
  N  N23  1  0.625  0.863  0.237  1.0
  N  N24  1  0.788  0.051  0.263  1.0
  N  N25  1  0.475  0.212  0.263  1.0
  N  N26  1  0.949  0.212  0.737  1.0
  N  N27  1  0.962  0.725  0.763  1.0
  N  N28  1  0.962  0.199  0.237  1.0
  N  N29  1  0.801  0.038  0.763  1.0
  N  N30  1  0.275  0.038  0.237  1.0
  N  N31  1  0.788  0.525  0.737  1.0
  O  O32  1  0.451  0.167  0.715  1.0
  O  O33  1  0.917  0.701  0.215  1.0
  O  O34  1  0.486  0.701  0.785  1.0
  O  O35  1  0.299  0.514  0.215  1.0
  O  O36  1  0.451  0.736  0.285  1.0
  O  O37  1  0.264  0.549  0.715  1.0
  O  O38  1  0.833  0.549  0.285  1.0
  O  O39  1  0.299  0.083  0.785  1.0
[/CIF]
.
The crystal structure described by Si2N2O is beta indium sulfide-derived structured and crystallizes in the tetragonal I4_1/amd space group. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), three equivalent N(2), and two equivalent O(1) atoms to form SiN4O2 octahedra that share corners with four equivalent Si(2)N4 tetrahedra, edges with two equivalent Si(3)N4O2 octahedra, and edges with four equivalent Si(1)N4O2 octahedra. In the second Si site, Si(2) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form corner-sharing SiN4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-58°. In the third Si site, Si(3) is bonded to four equivalent N(1) and two equivalent O(1) atoms to form SiN4O2 octahedra that share corners with four equivalent Si(2)N4 tetrahedra, edges with two equivalent Si(3)N4O2 octahedra, and edges with four equivalent Si(1)N4O2 octahedra. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted rectangular see-saw-like geometry to one Si(1), one Si(2), and two equivalent Si(3) atoms. In the second N site, N(2) is bonded to one Si(2) and three equivalent Si(1) atoms to form a mixture of distorted corner and edge-sharing NSi4 trigonal pyramids. O(1) is bonded in a distorted trigonal non-coplanar geometry to one Si(3) and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Si2N2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.312
_cell_length_b   12.312
_cell_length_c   12.312
_cell_angle_alpha   154.214
_cell_angle_beta   154.214
_cell_angle_gamma   36.789
_symmetry_Int_Tables_number   1
_cell_volume   352.706
_cell_formula_units_Z   8
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
  Si  Si0  1  0.707  0.957  0.250  1.0
  Si  Si1  1  0.543  0.293  0.250  1.0
  Si  Si2  1  0.043  0.293  0.750  1.0
  Si  Si3  1  0.043  0.793  0.750  1.0
  Si  Si4  1  0.043  0.293  0.250  1.0
  Si  Si5  1  0.707  0.957  0.750  1.0
  Si  Si6  1  0.207  0.957  0.250  1.0
  Si  Si7  1  0.707  0.457  0.750  1.0
  Si  Si8  1  0.919  0.419  0.500  1.0
  Si  Si9  1  0.169  0.169  0.000  1.0
  Si  Si10  1  0.831  0.831  0.000  1.0
  Si  Si11  1  0.581  0.081  0.500  1.0
  Si  Si12  1  0.375  0.625  0.250  1.0
  Si  Si13  1  0.375  0.625  0.750  1.0
  Si  Si14  1  0.875  0.625  0.250  1.0
  Si  Si15  1  0.375  0.125  0.750  1.0
  N  N16  1  0.125  0.387  0.263  1.0
  N  N17  1  0.137  0.375  0.763  1.0
  N  N18  1  0.612  0.375  0.237  1.0
  N  N19  1  0.625  0.388  0.763  1.0
  N  N20  1  0.125  0.862  0.737  1.0
  N  N21  1  0.138  0.875  0.263  1.0
  N  N22  1  0.613  0.875  0.737  1.0
  N  N23  1  0.625  0.863  0.237  1.0
  N  N24  1  0.788  0.051  0.263  1.0
  N  N25  1  0.475  0.212  0.263  1.0
  N  N26  1  0.949  0.212  0.737  1.0
  N  N27  1  0.962  0.725  0.763  1.0
  N  N28  1  0.962  0.199  0.237  1.0
  N  N29  1  0.801  0.038  0.763  1.0
  N  N30  1  0.275  0.038  0.237  1.0
  N  N31  1  0.788  0.525  0.737  1.0
  O  O32  1  0.451  0.167  0.715  1.0
  O  O33  1  0.917  0.701  0.215  1.0
  O  O34  1  0.486  0.701  0.785  1.0
  O  O35  1  0.299  0.514  0.215  1.0
  O  O36  1  0.451  0.736  0.285  1.0
  O  O37  1  0.264  0.549  0.715  1.0
  O  O38  1  0.833  0.549  0.285  1.0
  O  O39  1  0.299  0.083  0.785  1.0
[/CIF]
.