The compound described by Si(OCH3)4 crystallizes in the tetragonal I4_1/a space group. Si(1) is bonded in a tetrahedral geometry to four equivalent C(1) atoms. C(1) is bonded to one Si(1), one H(2), one H(3), and one O(1) atom to form corner-sharing CSiH2O tetrahedra. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to two equivalent O(1) atoms. In the second H site, H(2) is bonded in a single-bond geometry to one C(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. O(1) is bonded in a 3-coordinate geometry to one C(1) and two equivalent H(1) atoms. is represented by the CIF card [CIF]
data_SiH12(CO)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.123
_cell_length_b   9.004
_cell_length_c   9.004
_cell_angle_alpha   83.361
_cell_angle_beta   70.122
_cell_angle_gamma   70.122
_symmetry_Int_Tables_number   1
_cell_volume   439.057
_cell_formula_units_Z   2
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  0.500  0.000  0.000  1.0
  Si  Si1  1  0.250  0.500  0.500  1.0
  H  H2  1  0.383  0.403  0.098  1.0
  H  H3  1  0.883  0.597  0.902  1.0
  H  H4  1  0.535  0.598  0.097  1.0
  H  H5  1  0.230  0.402  0.903  1.0
  H  H6  1  0.367  0.097  0.402  1.0
  H  H7  1  0.867  0.903  0.598  1.0
  H  H8  1  0.215  0.902  0.403  1.0
  H  H9  1  0.520  0.098  0.597  1.0
  H  H10  1  0.729  0.198  0.920  1.0
  H  H11  1  0.847  0.802  0.080  1.0
  H  H12  1  0.677  0.420  0.302  1.0
  H  H13  1  0.399  0.580  0.698  1.0
  H  H14  1  0.021  0.302  0.580  1.0
  H  H15  1  0.903  0.698  0.420  1.0
  H  H16  1  0.073  0.080  0.198  1.0
  H  H17  1  0.351  0.920  0.802  1.0
  H  H18  1  0.633  0.170  0.129  1.0
  H  H19  1  0.932  0.830  0.871  1.0
  H  H20  1  0.553  0.629  0.330  1.0
  H  H21  1  0.512  0.371  0.670  1.0
  H  H22  1  0.117  0.330  0.371  1.0
  H  H23  1  0.818  0.670  0.629  1.0
  H  H24  1  0.197  0.871  0.170  1.0
  H  H25  1  0.238  0.129  0.830  1.0
  C  C26  1  0.576  0.183  0.023  1.0
  C  C27  1  0.781  0.817  0.977  1.0
  C  C28  1  0.509  0.523  0.317  1.0
  C  C29  1  0.349  0.477  0.683  1.0
  C  C30  1  0.174  0.317  0.477  1.0
  C  C31  1  0.969  0.683  0.523  1.0
  C  C32  1  0.241  0.977  0.183  1.0
  C  C33  1  0.401  0.023  0.817  1.0
  O  O34  1  0.359  0.321  0.044  1.0
  O  O35  1  0.723  0.679  0.956  1.0
  O  O36  1  0.430  0.544  0.179  1.0
  O  O37  1  0.153  0.456  0.821  1.0
  O  O38  1  0.391  0.179  0.456  1.0
  O  O39  1  0.027  0.821  0.544  1.0
  O  O40  1  0.320  0.956  0.321  1.0
  O  O41  1  0.597  0.044  0.679  1.0
[/CIF]
.
The compound described by Si(OCH3)4 crystallizes in the tetragonal I4_1/a space group. Si(1) is bonded in a tetrahedral geometry to four equivalent C(1) atoms. C(1) is bonded to one Si(1), one H(2), one H(3), and one O(1) atom to form corner-sharing CSiH2O tetrahedra. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to two equivalent O(1) atoms. In the second H site, H(2) is bonded in a single-bond geometry to one C(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. O(1) is bonded in a 3-coordinate geometry to one C(1) and two equivalent H(1) atoms. is represented by the CIF card [CIF]
data_SiH12(CO)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.123
_cell_length_b   9.004
_cell_length_c   9.004
_cell_angle_alpha   83.361
_cell_angle_beta   70.122
_cell_angle_gamma   70.122
_symmetry_Int_Tables_number   1
_cell_volume   439.057
_cell_formula_units_Z   2
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  0.500  0.000  0.000  1.0
  Si  Si1  1  0.250  0.500  0.500  1.0
  H  H2  1  0.383  0.403  0.098  1.0
  H  H3  1  0.883  0.597  0.902  1.0
  H  H4  1  0.535  0.598  0.097  1.0
  H  H5  1  0.230  0.402  0.903  1.0
  H  H6  1  0.367  0.097  0.402  1.0
  H  H7  1  0.867  0.903  0.598  1.0
  H  H8  1  0.215  0.902  0.403  1.0
  H  H9  1  0.520  0.098  0.597  1.0
  H  H10  1  0.729  0.198  0.920  1.0
  H  H11  1  0.847  0.802  0.080  1.0
  H  H12  1  0.677  0.420  0.302  1.0
  H  H13  1  0.399  0.580  0.698  1.0
  H  H14  1  0.021  0.302  0.580  1.0
  H  H15  1  0.903  0.698  0.420  1.0
  H  H16  1  0.073  0.080  0.198  1.0
  H  H17  1  0.351  0.920  0.802  1.0
  H  H18  1  0.633  0.170  0.129  1.0
  H  H19  1  0.932  0.830  0.871  1.0
  H  H20  1  0.553  0.629  0.330  1.0
  H  H21  1  0.512  0.371  0.670  1.0
  H  H22  1  0.117  0.330  0.371  1.0
  H  H23  1  0.818  0.670  0.629  1.0
  H  H24  1  0.197  0.871  0.170  1.0
  H  H25  1  0.238  0.129  0.830  1.0
  C  C26  1  0.576  0.183  0.023  1.0
  C  C27  1  0.781  0.817  0.977  1.0
  C  C28  1  0.509  0.523  0.317  1.0
  C  C29  1  0.349  0.477  0.683  1.0
  C  C30  1  0.174  0.317  0.477  1.0
  C  C31  1  0.969  0.683  0.523  1.0
  C  C32  1  0.241  0.977  0.183  1.0
  C  C33  1  0.401  0.023  0.817  1.0
  O  O34  1  0.359  0.321  0.044  1.0
  O  O35  1  0.723  0.679  0.956  1.0
  O  O36  1  0.430  0.544  0.179  1.0
  O  O37  1  0.153  0.456  0.821  1.0
  O  O38  1  0.391  0.179  0.456  1.0
  O  O39  1  0.027  0.821  0.544  1.0
  O  O40  1  0.320  0.956  0.321  1.0
  O  O41  1  0.597  0.044  0.679  1.0
[/CIF]
.