data_NaTa2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.25
_cell_length_b   3.25
_cell_length_c   8.17
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaTa2Se
_chemical_formula_sum   'Na1 Ta2 Se1'
_cell_volume   86.24
_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  0.24  1.0
  Ta  Ta2  1  0.0  0.0  0.09  1.0
  Ta  Ta3  1  0.62  0.62  0.56  1.0
  Se  Se1  1  0.62  0.62  0.55  1.0

data_NaTa2Se
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.59
_cell_length_b   4.59
_cell_length_c   8.17
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NaTa2Se
_chemical_formula_sum   'Na2 Ta4 Se2'
_cell_volume   172.48
_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  0.24  1.0
  Ta  Ta1  2  0.0  0.0  0.09  1.0
  Ta  Ta2  2  0.12  0.5  0.56  1.0
  Se  Se3  2  0.12  0.5  0.55  1.0

Na Ta Ta Se
Na Ta Ta Se 0 1 o o o 2 3 o o o 
NaTaTaSe is alpha carbon monoxide-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two NaTa clusters and two TaSe clusters. In each NaTa cluster, Na(1) is bonded in a single-bond geometry to one Ta(1) atom. The Na(1)-Ta(1) bond length is 1.21 Å. Ta(1) is bonded in a single-bond geometry to one Na(1) atom. In each TaSe cluster, Ta(2) is bonded in a single-bond geometry to one Se(1) atom. The Ta(2)-Se(1) bond length is 0.08 Å. Se(1) is bonded in a single-bond geometry to one Ta(2) atom.