data_Na2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   5.17
_cell_angle_alpha   105.41
_cell_angle_beta   105.41
_cell_angle_gamma   117.94
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2C
_chemical_formula_sum   'Na4 C2'
_cell_volume   104.39
_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
  Na  Na2  1  0.21  0.92  0.0  1.0
  Na  Na3  1  0.92  0.21  0.66  1.0
  Na  Na4  1  0.34  0.21  0.0  1.0
  Na  Na5  1  0.79  0.92  0.66  1.0
  C  C0  1  0.0  0.0  0.99  1.0
  C  C1  1  0.0  0.0  0.33  1.0

data_Na2C
_symmetry_space_group_name_H-M   P1
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   5.17
_cell_angle_alpha   105.41
_cell_angle_beta   105.41
_cell_angle_gamma   117.94
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2C
_chemical_formula_sum   'Na4 C2'
_cell_volume   104.39
_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
  Na  Na0  1  0.21  0.92  -0.0  1.0
  Na  Na1  1  0.34  0.21  -0.0  1.0
  Na  Na2  1  0.79  0.92  0.66  1.0
  Na  Na3  1  0.92  0.21  0.66  1.0
  C  C4  1  0.0  0.0  0.33  1.0
  C  C5  1  0.0  0.0  0.99  1.0

Na Na Na Na C C
Na2C is Protactinium structured and crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one Na2C cluster. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a single-bond geometry to one C(1) atom. The Na(1)-C(1) bond length is 1.31 Å. In the second Na site, Na(2) is bonded in a distorted L-shaped geometry to one Na(4) and one C(2) atom. The Na(2)-Na(4) bond length is 1.30 Å. The Na(2)-C(2) bond length is 2.01 Å. In the third Na site, Na(3) is bonded in a distorted single-bond geometry to one C(1) atom. The Na(3)-C(1) bond length is 1.55 Å. In the fourth Na site, Na(4) is bonded in a distorted single-bond geometry to one Na(2) and one C(1) atom. The Na(4)-C(1) bond length is 1.58 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 3-coordinate geometry to one Na(1), one Na(3), and one Na(4) atom. In the second C site, C(2) is bonded in a 1-coordinate geometry to one Na(2) atom.