The structure described by Si5C3 crystallizes in the trigonal R3 space group. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a trigonal planar geometry to three equivalent C(1) atoms. In the second Si site, Si(2) is bonded in a distorted bent 120 degrees geometry to one Si(3) and two equivalent C(1) atoms. In the third Si site, Si(3) is bonded in a 3-coordinate geometry to three equivalent Si(2) atoms. C(1) is bonded in a trigonal planar geometry to one Si(1) and two equivalent Si(2) atoms. is represented by the CIF file [CIF]
data_Si5C3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.595
_cell_length_b   5.595
_cell_length_c   5.595
_cell_angle_alpha   97.303
_cell_angle_beta   97.303
_cell_angle_gamma   97.303
_symmetry_Int_Tables_number   1
_cell_volume   170.473
_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  Si0  1  0.385  0.385  0.385  1.0
  Si  Si1  1  0.563  0.844  0.357  1.0
  Si  Si2  1  0.844  0.357  0.563  1.0
  Si  Si3  1  0.357  0.563  0.844  1.0
  Si  Si4  1  0.722  0.722  0.722  1.0
  C  C5  1  0.165  0.359  0.604  1.0
  C  C6  1  0.359  0.604  0.165  1.0
  C  C7  1  0.604  0.165  0.359  1.0
[/CIF]
.
The structure described by Si5C3 crystallizes in the trigonal R3 space group. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a trigonal planar geometry to three equivalent C(1) atoms. In the second Si site, Si(2) is bonded in a distorted bent 120 degrees geometry to one Si(3) and two equivalent C(1) atoms. In the third Si site, Si(3) is bonded in a 3-coordinate geometry to three equivalent Si(2) atoms. C(1) is bonded in a trigonal planar geometry to one Si(1) and two equivalent Si(2) atoms. is represented by the CIF file [CIF]
data_Si5C3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.595
_cell_length_b   5.595
_cell_length_c   5.595
_cell_angle_alpha   97.303
_cell_angle_beta   97.303
_cell_angle_gamma   97.303
_symmetry_Int_Tables_number   1
_cell_volume   170.473
_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  Si0  1  0.385  0.385  0.385  1.0
  Si  Si1  1  0.563  0.844  0.357  1.0
  Si  Si2  1  0.844  0.357  0.563  1.0
  Si  Si3  1  0.357  0.563  0.844  1.0
  Si  Si4  1  0.722  0.722  0.722  1.0
  C  C5  1  0.165  0.359  0.604  1.0
  C  C6  1  0.359  0.604  0.165  1.0
  C  C7  1  0.604  0.165  0.359  1.0
[/CIF]
.