The material described by Si2H2O3 is Indium-like structured and crystallizes in the trigonal R-3 space group. The structure is zero-dimensional and consists of three octasilsesquioxane cage molecules. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one H(1), one O(1), and two equivalent O(2) atoms to form corner-sharing SiHO3 tetrahedra. In the second Si site, Si(2) is bonded to one H(2) and three equivalent O(1) atoms to form corner-sharing SiHO3 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Si(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one Si(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Si2H2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.522
_cell_length_b   7.522
_cell_length_c   7.522
_cell_angle_alpha   77.965
_cell_angle_beta   77.965
_cell_angle_gamma   77.965
_symmetry_Int_Tables_number   1
_cell_volume   401.015
_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
  Si  Si0  1  0.766  0.658  0.252  1.0
  Si  Si1  1  0.252  0.766  0.658  1.0
  Si  Si2  1  0.658  0.252  0.766  1.0
  Si  Si3  1  0.234  0.342  0.748  1.0
  Si  Si4  1  0.748  0.234  0.342  1.0
  Si  Si5  1  0.342  0.748  0.234  1.0
  Si  Si6  1  0.676  0.676  0.676  1.0
  Si  Si7  1  0.324  0.324  0.324  1.0
  H  H8  1  0.909  0.744  0.117  1.0
  H  H9  1  0.117  0.909  0.744  1.0
  H  H10  1  0.744  0.117  0.909  1.0
  H  H11  1  0.091  0.256  0.883  1.0
  H  H12  1  0.883  0.091  0.256  1.0
  H  H13  1  0.256  0.883  0.091  1.0
  H  H14  1  0.771  0.771  0.771  1.0
  H  H15  1  0.229  0.229  0.229  1.0
  O  O16  1  0.301  0.543  0.231  1.0
  O  O17  1  0.543  0.231  0.301  1.0
  O  O18  1  0.231  0.301  0.543  1.0
  O  O19  1  0.699  0.457  0.769  1.0
  O  O20  1  0.457  0.769  0.699  1.0
  O  O21  1  0.769  0.699  0.457  1.0
  O  O22  1  0.253  0.808  0.435  1.0
  O  O23  1  0.808  0.435  0.253  1.0
  O  O24  1  0.435  0.253  0.808  1.0
  O  O25  1  0.747  0.192  0.565  1.0
  O  O26  1  0.192  0.565  0.747  1.0
  O  O27  1  0.565  0.747  0.192  1.0
[/CIF]
.
The material described by Si2H2O3 is Indium-like structured and crystallizes in the trigonal R-3 space group. The structure is zero-dimensional and consists of three octasilsesquioxane cage molecules. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one H(1), one O(1), and two equivalent O(2) atoms to form corner-sharing SiHO3 tetrahedra. In the second Si site, Si(2) is bonded to one H(2) and three equivalent O(1) atoms to form corner-sharing SiHO3 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Si(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one Si(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Si2H2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.522
_cell_length_b   7.522
_cell_length_c   7.522
_cell_angle_alpha   77.965
_cell_angle_beta   77.965
_cell_angle_gamma   77.965
_symmetry_Int_Tables_number   1
_cell_volume   401.015
_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
  Si  Si0  1  0.766  0.658  0.252  1.0
  Si  Si1  1  0.252  0.766  0.658  1.0
  Si  Si2  1  0.658  0.252  0.766  1.0
  Si  Si3  1  0.234  0.342  0.748  1.0
  Si  Si4  1  0.748  0.234  0.342  1.0
  Si  Si5  1  0.342  0.748  0.234  1.0
  Si  Si6  1  0.676  0.676  0.676  1.0
  Si  Si7  1  0.324  0.324  0.324  1.0
  H  H8  1  0.909  0.744  0.117  1.0
  H  H9  1  0.117  0.909  0.744  1.0
  H  H10  1  0.744  0.117  0.909  1.0
  H  H11  1  0.091  0.256  0.883  1.0
  H  H12  1  0.883  0.091  0.256  1.0
  H  H13  1  0.256  0.883  0.091  1.0
  H  H14  1  0.771  0.771  0.771  1.0
  H  H15  1  0.229  0.229  0.229  1.0
  O  O16  1  0.301  0.543  0.231  1.0
  O  O17  1  0.543  0.231  0.301  1.0
  O  O18  1  0.231  0.301  0.543  1.0
  O  O19  1  0.699  0.457  0.769  1.0
  O  O20  1  0.457  0.769  0.699  1.0
  O  O21  1  0.769  0.699  0.457  1.0
  O  O22  1  0.253  0.808  0.435  1.0
  O  O23  1  0.808  0.435  0.253  1.0
  O  O24  1  0.435  0.253  0.808  1.0
  O  O25  1  0.747  0.192  0.565  1.0
  O  O26  1  0.192  0.565  0.747  1.0
  O  O27  1  0.565  0.747  0.192  1.0
[/CIF]
.