The crystal structure described by NaSn2 crystallizes in the monoclinic C2/m space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 2-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), and four equivalent Sn(5) atoms. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), and four equivalent Sn(5) atoms. In the third Na site, Na(3) is bonded to two equivalent Sn(3) and two equivalent Sn(4) atoms to form edge-sharing NaSn4 tetrahedra. In the fourth Na site, Na(4) is bonded in a 6-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), three equivalent Sn(3), and three equivalent Sn(4) atoms. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(4), one Sn(1), one Sn(2), one Sn(3), and one Sn(5) atom. In the second Sn site, Sn(2) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(4), one Sn(1), one Sn(2), one Sn(4), and one Sn(5) atom. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to two equivalent Na(3), three equivalent Na(4), one Sn(4), and two equivalent Sn(1) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to two equivalent Na(3), three equivalent Na(4), one Sn(3), and two equivalent Sn(2) atoms. In the fifth Sn site, Sn(5) is bonded in a 7-coordinate geometry to two equivalent Na(1), two equivalent Na(2), one Sn(1), one Sn(2), and one Sn(5) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaSn2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.934
_cell_length_b   7.610
_cell_length_c   15.446
_cell_angle_alpha   101.250
_cell_angle_beta   90.000
_cell_angle_gamma   117.100
_symmetry_Int_Tables_number   1
_cell_volume   707.920
_cell_formula_units_Z   8
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  0.380  0.761  0.564  1.0
  Na  Na1  1  0.089  0.177  0.418  1.0
  Na  Na2  1  0.250  0.000  0.000  1.0
  Na  Na3  1  0.727  0.453  0.911  1.0
  Na  Na4  1  0.620  0.239  0.436  1.0
  Na  Na5  1  0.911  0.823  0.582  1.0
  Na  Na6  1  0.750  0.000  0.000  1.0
  Na  Na7  1  0.273  0.547  0.089  1.0
  Sn  Sn8  1  0.613  0.659  0.747  1.0
  Sn  Sn9  1  0.330  0.088  0.747  1.0
  Sn  Sn10  1  0.046  0.659  0.747  1.0
  Sn  Sn11  1  0.326  0.652  0.885  1.0
  Sn  Sn12  1  0.670  0.912  0.253  1.0
  Sn  Sn13  1  0.115  0.231  0.885  1.0
  Sn  Sn14  1  0.634  0.696  0.394  1.0
  Sn  Sn15  1  0.954  0.341  0.253  1.0
  Sn  Sn16  1  0.758  0.088  0.747  1.0
  Sn  Sn17  1  0.387  0.341  0.253  1.0
  Sn  Sn18  1  0.674  0.348  0.115  1.0
  Sn  Sn19  1  0.938  0.304  0.606  1.0
  Sn  Sn20  1  0.062  0.696  0.394  1.0
  Sn  Sn21  1  0.885  0.769  0.115  1.0
  Sn  Sn22  1  0.366  0.304  0.606  1.0
  Sn  Sn23  1  0.242  0.912  0.253  1.0
[/CIF]
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The crystal structure described by NaSn2 crystallizes in the monoclinic C2/m space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 2-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), and four equivalent Sn(5) atoms. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), and four equivalent Sn(5) atoms. In the third Na site, Na(3) is bonded to two equivalent Sn(3) and two equivalent Sn(4) atoms to form edge-sharing NaSn4 tetrahedra. In the fourth Na site, Na(4) is bonded in a 6-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), three equivalent Sn(3), and three equivalent Sn(4) atoms. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(4), one Sn(1), one Sn(2), one Sn(3), and one Sn(5) atom. In the second Sn site, Sn(2) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(4), one Sn(1), one Sn(2), one Sn(4), and one Sn(5) atom. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to two equivalent Na(3), three equivalent Na(4), one Sn(4), and two equivalent Sn(1) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to two equivalent Na(3), three equivalent Na(4), one Sn(3), and two equivalent Sn(2) atoms. In the fifth Sn site, Sn(5) is bonded in a 7-coordinate geometry to two equivalent Na(1), two equivalent Na(2), one Sn(1), one Sn(2), and one Sn(5) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaSn2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.934
_cell_length_b   7.610
_cell_length_c   15.446
_cell_angle_alpha   101.250
_cell_angle_beta   90.000
_cell_angle_gamma   117.100
_symmetry_Int_Tables_number   1
_cell_volume   707.920
_cell_formula_units_Z   8
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  0.380  0.761  0.564  1.0
  Na  Na1  1  0.089  0.177  0.418  1.0
  Na  Na2  1  0.250  0.000  0.000  1.0
  Na  Na3  1  0.727  0.453  0.911  1.0
  Na  Na4  1  0.620  0.239  0.436  1.0
  Na  Na5  1  0.911  0.823  0.582  1.0
  Na  Na6  1  0.750  0.000  0.000  1.0
  Na  Na7  1  0.273  0.547  0.089  1.0
  Sn  Sn8  1  0.613  0.659  0.747  1.0
  Sn  Sn9  1  0.330  0.088  0.747  1.0
  Sn  Sn10  1  0.046  0.659  0.747  1.0
  Sn  Sn11  1  0.326  0.652  0.885  1.0
  Sn  Sn12  1  0.670  0.912  0.253  1.0
  Sn  Sn13  1  0.115  0.231  0.885  1.0
  Sn  Sn14  1  0.634  0.696  0.394  1.0
  Sn  Sn15  1  0.954  0.341  0.253  1.0
  Sn  Sn16  1  0.758  0.088  0.747  1.0
  Sn  Sn17  1  0.387  0.341  0.253  1.0
  Sn  Sn18  1  0.674  0.348  0.115  1.0
  Sn  Sn19  1  0.938  0.304  0.606  1.0
  Sn  Sn20  1  0.062  0.696  0.394  1.0
  Sn  Sn21  1  0.885  0.769  0.115  1.0
  Sn  Sn22  1  0.366  0.304  0.606  1.0
  Sn  Sn23  1  0.242  0.912  0.253  1.0
[/CIF]
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