data_SiHI3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.08
_cell_length_b   5.08
_cell_length_c   5.08
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiHI3
_chemical_formula_sum   'Si1 H1 I3'
_cell_volume   130.91
_cell_formula_units_Z   1
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  Si4  1  0.54  0.54  0.54  1.0
  H  H3  1  0.0  0.0  0.0  1.0
  I  I0  1  0.0  0.54  0.0  1.0
  I  I1  1  0.0  0.0  0.54  1.0
  I  I2  1  0.54  0.0  0.0  1.0

data_SiHI3
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.18
_cell_length_b   7.18
_cell_length_c   8.79
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SiHI3
_chemical_formula_sum   'Si3 H3 I9'
_cell_volume   392.72
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.54  1.0
  H  H1  3  0.0  0.0  0.0  1.0
  I  I2  9  0.03  0.51  0.51  1.0

Si H I I I
SiHI3 is (Cubic) Perovskite structured and crystallizes in the trigonal R3m space group. The structure is zero-dimensional and consists of three 7440-21-3 atoms and three HI3 clusters. In each HI3 cluster, H(1) is bonded in a distorted T-shaped geometry to three equivalent I(1) atoms. All H(1)-I(1) bond lengths are 2.34 Å. I(1) is bonded in a single-bond geometry to one H(1) atom.