data_Na2Tl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.63
_cell_length_b   6.63
_cell_length_c   8.19
_cell_angle_alpha   104.92
_cell_angle_beta   104.92
_cell_angle_gamma   30.92
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2Tl
_chemical_formula_sum   'Na4 Tl2'
_cell_volume   178.37
_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  0.38  0.0  0.97  1.0
  Na  Na1  1  0.6  0.0  0.67  1.0
  Na  Na2  1  0.22  0.0  0.92  1.0
  Na  Na3  1  1.0  0.0  0.22  1.0
  Tl  Tl4  1  0.69  0.0  0.42  1.0
  Tl  Tl5  1  0.91  0.0  0.48  1.0

data_Na2Tl
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.54
_cell_length_b   6.63
_cell_length_c   8.19
_cell_angle_alpha   104.92
_cell_angle_beta   90.0
_cell_angle_gamma   105.46
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Na2Tl
_chemical_formula_sum   'Na4 Tl2'
_cell_volume   178.37
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  2  0.0  0.2  0.28  1.0
  Na  Na1  2  0.0  0.42  0.98  1.0
  Tl  Tl2  2  0.0  0.11  0.53  1.0

Na Na Na Na Tl Tl
Na Na Na Na Tl Tl 0 2 o o o 1 4 o o o 3 5 o o o 4 5 o o o 
Na2Tl crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one disodium molecule and one NaTl cluster. In the NaTl cluster, Na(2) is bonded in a single-bond geometry to one Tl(1) atom. The Na(2)-Tl(1) bond length is 2.29 Å. Tl(1) is bonded in a distorted water-like geometry to one Na(2) and one Tl(1) atom. The Tl(1)-Tl(1) bond length is 1.42 Å.