The structure described by Si2CN4 crystallizes in the orthorhombic Aea2 space group. Si(1) is bonded to one N(1) and three equivalent N(2) atoms to form corner-sharing SiN4 tetrahedra. C(1) is bonded in a linear geometry to two equivalent N(1) atoms. There are two inequivalent N sites. In the first N site, N(1) is bonded in a linear geometry to one Si(1) and one C(1) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to three equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_Si2CN4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.850
_cell_length_b   5.473
_cell_length_c   7.373
_cell_angle_alpha   90.000
_cell_angle_beta   109.200
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   184.829
_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  0.233  0.597  0.595  1.0
  Si  Si1  1  0.638  0.403  0.405  1.0
  Si  Si2  1  0.733  0.903  0.595  1.0
  Si  Si3  1  0.138  0.097  0.405  1.0
  C  C4  1  0.483  0.500  0.000  1.0
  C  C5  1  0.983  0.000  0.000  1.0
  N  N6  1  0.404  0.531  0.829  1.0
  N  N7  1  0.575  0.469  0.171  1.0
  N  N8  1  0.361  0.874  0.543  1.0
  N  N9  1  0.818  0.126  0.457  1.0
  N  N10  1  0.861  0.626  0.543  1.0
  N  N11  1  0.318  0.374  0.457  1.0
  N  N12  1  0.075  0.031  0.171  1.0
  N  N13  1  0.904  0.969  0.829  1.0
[/CIF]
.
The structure described by Si2CN4 crystallizes in the orthorhombic Aea2 space group. Si(1) is bonded to one N(1) and three equivalent N(2) atoms to form corner-sharing SiN4 tetrahedra. C(1) is bonded in a linear geometry to two equivalent N(1) atoms. There are two inequivalent N sites. In the first N site, N(1) is bonded in a linear geometry to one Si(1) and one C(1) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to three equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_Si2CN4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.850
_cell_length_b   5.473
_cell_length_c   7.373
_cell_angle_alpha   90.000
_cell_angle_beta   109.200
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   184.829
_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  0.233  0.597  0.595  1.0
  Si  Si1  1  0.638  0.403  0.405  1.0
  Si  Si2  1  0.733  0.903  0.595  1.0
  Si  Si3  1  0.138  0.097  0.405  1.0
  C  C4  1  0.483  0.500  0.000  1.0
  C  C5  1  0.983  0.000  0.000  1.0
  N  N6  1  0.404  0.531  0.829  1.0
  N  N7  1  0.575  0.469  0.171  1.0
  N  N8  1  0.361  0.874  0.543  1.0
  N  N9  1  0.818  0.126  0.457  1.0
  N  N10  1  0.861  0.626  0.543  1.0
  N  N11  1  0.318  0.374  0.457  1.0
  N  N12  1  0.075  0.031  0.171  1.0
  N  N13  1  0.904  0.969  0.829  1.0
[/CIF]
.