The structure described by Na2Mo2Se2O11 crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to two equivalent O(4) and two equivalent O(6) atoms. In the second Na site, Na(2) is bonded to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form NaO7 pentagonal bipyramids that share corners with four equivalent Mo(1)O6 octahedra and edges with two equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 12-46°. Mo(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted MoO6 octahedra that share  a cornercorner with one Mo(1)O6 octahedra, corners with two equivalent Na(2)O7 pentagonal bipyramids, and  an edgeedge with one Na(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 38°. Se(1) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(2) and two equivalent Mo(1) atoms. In the second O site, O(4) is bonded in a trigonal planar geometry to one Na(1), one Mo(1), and one Se(1) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to one Na(2), one Mo(1), and one Se(1) atom. In the fourth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(1), one Mo(1), and one Se(1) atom. In the fifth O site, O(1) is bonded in a linear geometry to one Na(2) and one Mo(1) atom. In the sixth O site, O(2) is bonded in a 2-coordinate geometry to one Na(2) and one Mo(1) atom. is represented by the CIF card [CIF]
data_Na2Mo2Se2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.064
_cell_length_b   9.064
_cell_length_c   9.574
_cell_angle_alpha   67.396
_cell_angle_beta   67.396
_cell_angle_gamma   42.977
_symmetry_Int_Tables_number   1
_cell_volume   488.332
_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  0.500  0.000  0.000  1.0
  Na  Na1  1  0.000  0.500  0.500  1.0
  Na  Na2  1  0.754  0.246  0.750  1.0
  Na  Na3  1  0.246  0.754  0.250  1.0
  Mo  Mo4  1  0.822  0.384  0.273  1.0
  Mo  Mo5  1  0.616  0.178  0.227  1.0
  Mo  Mo6  1  0.178  0.616  0.727  1.0
  Mo  Mo7  1  0.384  0.822  0.773  1.0
  Se  Se8  1  0.417  0.920  0.389  1.0
  Se  Se9  1  0.080  0.583  0.111  1.0
  Se  Se10  1  0.583  0.080  0.611  1.0
  Se  Se11  1  0.920  0.417  0.889  1.0
  O  O12  1  0.824  0.292  0.469  1.0
  O  O13  1  0.708  0.176  0.031  1.0
  O  O14  1  0.176  0.708  0.531  1.0
  O  O15  1  0.292  0.824  0.969  1.0
  O  O16  1  0.066  0.147  0.193  1.0
  O  O17  1  0.853  0.934  0.307  1.0
  O  O18  1  0.934  0.853  0.807  1.0
  O  O19  1  0.147  0.066  0.693  1.0
  O  O20  1  0.623  0.377  0.250  1.0
  O  O21  1  0.377  0.623  0.750  1.0
  O  O22  1  0.518  0.029  0.236  1.0
  O  O23  1  0.971  0.482  0.264  1.0
  O  O24  1  0.482  0.971  0.764  1.0
  O  O25  1  0.029  0.518  0.736  1.0
  O  O26  1  0.518  0.725  0.295  1.0
  O  O27  1  0.275  0.482  0.205  1.0
  O  O28  1  0.482  0.275  0.705  1.0
  O  O29  1  0.725  0.518  0.795  1.0
  O  O30  1  0.581  0.775  0.525  1.0
  O  O31  1  0.225  0.419  0.975  1.0
  O  O32  1  0.419  0.225  0.475  1.0
  O  O33  1  0.775  0.581  0.025  1.0
[/CIF]
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The structure described by Na2Mo2Se2O11 crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to two equivalent O(4) and two equivalent O(6) atoms. In the second Na site, Na(2) is bonded to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form NaO7 pentagonal bipyramids that share corners with four equivalent Mo(1)O6 octahedra and edges with two equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 12-46°. Mo(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted MoO6 octahedra that share  a cornercorner with one Mo(1)O6 octahedra, corners with two equivalent Na(2)O7 pentagonal bipyramids, and  an edgeedge with one Na(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 38°. Se(1) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(2) and two equivalent Mo(1) atoms. In the second O site, O(4) is bonded in a trigonal planar geometry to one Na(1), one Mo(1), and one Se(1) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to one Na(2), one Mo(1), and one Se(1) atom. In the fourth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(1), one Mo(1), and one Se(1) atom. In the fifth O site, O(1) is bonded in a linear geometry to one Na(2) and one Mo(1) atom. In the sixth O site, O(2) is bonded in a 2-coordinate geometry to one Na(2) and one Mo(1) atom. is represented by the CIF card [CIF]
data_Na2Mo2Se2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.064
_cell_length_b   9.064
_cell_length_c   9.574
_cell_angle_alpha   67.396
_cell_angle_beta   67.396
_cell_angle_gamma   42.977
_symmetry_Int_Tables_number   1
_cell_volume   488.332
_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  0.500  0.000  0.000  1.0
  Na  Na1  1  0.000  0.500  0.500  1.0
  Na  Na2  1  0.754  0.246  0.750  1.0
  Na  Na3  1  0.246  0.754  0.250  1.0
  Mo  Mo4  1  0.822  0.384  0.273  1.0
  Mo  Mo5  1  0.616  0.178  0.227  1.0
  Mo  Mo6  1  0.178  0.616  0.727  1.0
  Mo  Mo7  1  0.384  0.822  0.773  1.0
  Se  Se8  1  0.417  0.920  0.389  1.0
  Se  Se9  1  0.080  0.583  0.111  1.0
  Se  Se10  1  0.583  0.080  0.611  1.0
  Se  Se11  1  0.920  0.417  0.889  1.0
  O  O12  1  0.824  0.292  0.469  1.0
  O  O13  1  0.708  0.176  0.031  1.0
  O  O14  1  0.176  0.708  0.531  1.0
  O  O15  1  0.292  0.824  0.969  1.0
  O  O16  1  0.066  0.147  0.193  1.0
  O  O17  1  0.853  0.934  0.307  1.0
  O  O18  1  0.934  0.853  0.807  1.0
  O  O19  1  0.147  0.066  0.693  1.0
  O  O20  1  0.623  0.377  0.250  1.0
  O  O21  1  0.377  0.623  0.750  1.0
  O  O22  1  0.518  0.029  0.236  1.0
  O  O23  1  0.971  0.482  0.264  1.0
  O  O24  1  0.482  0.971  0.764  1.0
  O  O25  1  0.029  0.518  0.736  1.0
  O  O26  1  0.518  0.725  0.295  1.0
  O  O27  1  0.275  0.482  0.205  1.0
  O  O28  1  0.482  0.275  0.705  1.0
  O  O29  1  0.725  0.518  0.795  1.0
  O  O30  1  0.581  0.775  0.525  1.0
  O  O31  1  0.225  0.419  0.975  1.0
  O  O32  1  0.419  0.225  0.475  1.0
  O  O33  1  0.775  0.581  0.025  1.0
[/CIF]
.