data_Na2ReSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.29
_cell_length_b   3.29
_cell_length_c   8.49
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2ReSi
_chemical_formula_sum   'Na2 Re1 Si1'
_cell_volume   91.66
_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
  Na  Na0  1  0.64  0.64  0.04  1.0
  Na  Na1  1  0.0  0.0  0.63  1.0
  Re  Re2  1  0.64  0.64  0.98  1.0
  Si  Si3  1  0.0  0.0  0.57  1.0

data_Na2ReSi
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.65
_cell_length_b   4.65
_cell_length_c   8.49
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Na2ReSi
_chemical_formula_sum   'Na4 Re2 Si2'
_cell_volume   183.32
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Na  Na0  2  0.0  0.0  0.63  1.0
  Na  Na1  2  0.14  0.5  0.04  1.0
  Si  Si2  2  0.0  0.0  0.57  1.0
  Re  Re3  2  0.14  0.5  0.98  1.0

Na Na Re Si
NaReNaSi is alpha carbon monoxide-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two rhenium;sodium molecules and two sodium silanide molecules.