data_NaMn2Sn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.12
_cell_length_b   3.12
_cell_length_c   8.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaMn2Sn
_chemical_formula_sum   'Na1 Mn2 Sn1'
_cell_volume   79.74
_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  Na2  1  0.0  0.0  0.93  1.0
  Mn  Mn0  1  0.0  0.0  0.32  1.0
  Mn  Mn1  1  0.56  0.56  0.45  1.0
  Sn  Sn3  1  0.56  0.56  0.57  1.0

data_NaMn2Sn
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.41
_cell_length_b   4.41
_cell_length_c   8.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NaMn2Sn
_chemical_formula_sum   'Na2 Mn4 Sn2'
_cell_volume   159.48
_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  0.93  1.0
  Mn  Mn1  2  0.0  0.0  0.32  1.0
  Mn  Mn2  2  0.06  0.5  0.45  1.0
  Sn  Sn3  2  0.06  0.5  0.57  1.0

Na Mn Mn Sn
NaMn2Sn crystallizes in the monoclinic Cm space group. Na(1) is bonded in a 8-coordinate geometry to four equivalent Na(1), one Mn(1), and three equivalent Sn(1) atoms. All Na(1)-Na(1) bond lengths are 3.12 Å. The Na(1)-Mn(1) bond length is 3.23 Å. There is one shorter (3.55 Å) and two longer (3.72 Å) Na(1)-Sn(1) bond lengths. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 5-coordinate geometry to one Na(1) and four equivalent Mn(2) atoms. There are a spread of Mn(1)-Mn(2) bond distances ranging from 2.21-2.69 Å. In the second Mn site, Mn(2) is bonded in a single-bond geometry to four equivalent Mn(1) and one Sn(1) atom. The Mn(2)-Sn(1) bond length is 0.92 Å. Sn(1) is bonded in a single-bond geometry to three equivalent Na(1) and one Mn(2) atom.