data_Na2Tc
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.6
_cell_length_b   8.6
_cell_length_c   8.6
_cell_angle_alpha   162.19
_cell_angle_beta   162.19
_cell_angle_gamma   25.3
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2Tc
_chemical_formula_sum   'Na2 Tc1'
_cell_volume   59.59
_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  0.0  0.0  0.82  1.0
  Na  Na1  1  0.0  0.0  0.97  1.0
  Tc  Tc2  1  0.0  0.0  0.0  1.0

data_Na2Tc
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.77
_cell_length_b   3.77
_cell_length_c   8.6
_cell_angle_alpha   90.0
_cell_angle_beta   102.65
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Na2Tc
_chemical_formula_sum   'Na4 Tc2'
_cell_volume   119.18
_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  0.03  1.0
  Na  Na1  2  0.0  0.0  0.18  1.0
  Tc  Tc2  2  0.0  0.0  0.0  1.0

Na Na Tc
Na2Tc is alpha carbon monoxide-like structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Na2Tc clusters. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a single-bond geometry to one Na(2) atom. The Na(1)-Na(2) bond length is 1.22 Å. In the second Na site, Na(2) is bonded in a single-bond geometry to one Na(1) and one Tc(1) atom. The Na(2)-Tc(1) bond length is 0.30 Å. Tc(1) is bonded in a single-bond geometry to one Na(2) atom.