The crystal structure described by Na(VSe2)2 crystallizes in the monoclinic Pm space group. Na(1) is bonded in a 6-coordinate geometry to one Se(2), one Se(4), two equivalent Se(1), and two equivalent Se(3) atoms. There are two inequivalent V sites. In the first V site, V(1) is bonded to one Se(1), one Se(3), two equivalent Se(2), and two equivalent Se(4) atoms to form edge-sharing VSe6 octahedra. In the second V site, V(2) is bonded to one Se(2), one Se(4), two equivalent Se(1), and two equivalent Se(3) atoms to form edge-sharing VSe6 octahedra. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Na(1), one V(1), and two equivalent V(2) atoms to form a mixture of edge and corner-sharing SeNa2V3 square pyramids. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one V(2), and two equivalent V(1) atoms. In the third Se site, Se(3) is bonded to two equivalent Na(1), one V(1), and two equivalent V(2) atoms to form a mixture of distorted edge and corner-sharing SeNa2V3 trigonal bipyramids. In the fourth Se site, Se(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one V(2), and two equivalent V(1) atoms. is represented by the CIF card [CIF]
data_Na(VSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.571
_cell_length_b   6.142
_cell_length_c   7.805
_cell_angle_alpha   68.404
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   159.174
_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  0.500  0.651  0.504  1.0
  V  V1  1  0.000  0.978  0.993  1.0
  V  V2  1  0.500  0.531  0.007  1.0
  Se  Se3  1  0.000  0.566  0.221  1.0
  Se  Se4  1  0.500  0.085  0.186  1.0
  Se  Se5  1  0.000  0.420  0.814  1.0
  Se  Se6  1  0.500  0.935  0.779  1.0
[/CIF]
.
The crystal structure described by Na(VSe2)2 crystallizes in the monoclinic Pm space group. Na(1) is bonded in a 6-coordinate geometry to one Se(2), one Se(4), two equivalent Se(1), and two equivalent Se(3) atoms. There are two inequivalent V sites. In the first V site, V(1) is bonded to one Se(1), one Se(3), two equivalent Se(2), and two equivalent Se(4) atoms to form edge-sharing VSe6 octahedra. In the second V site, V(2) is bonded to one Se(2), one Se(4), two equivalent Se(1), and two equivalent Se(3) atoms to form edge-sharing VSe6 octahedra. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Na(1), one V(1), and two equivalent V(2) atoms to form a mixture of edge and corner-sharing SeNa2V3 square pyramids. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one V(2), and two equivalent V(1) atoms. In the third Se site, Se(3) is bonded to two equivalent Na(1), one V(1), and two equivalent V(2) atoms to form a mixture of distorted edge and corner-sharing SeNa2V3 trigonal bipyramids. In the fourth Se site, Se(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one V(2), and two equivalent V(1) atoms. is represented by the CIF card [CIF]
data_Na(VSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.571
_cell_length_b   6.142
_cell_length_c   7.805
_cell_angle_alpha   68.404
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   159.174
_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  0.500  0.651  0.504  1.0
  V  V1  1  0.000  0.978  0.993  1.0
  V  V2  1  0.500  0.531  0.007  1.0
  Se  Se3  1  0.000  0.566  0.221  1.0
  Se  Se4  1  0.500  0.085  0.186  1.0
  Se  Se5  1  0.000  0.420  0.814  1.0
  Se  Se6  1  0.500  0.935  0.779  1.0
[/CIF]
.