data_SrMnSn2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.58
_cell_length_b   3.58
_cell_length_c   7.74
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrMnSn2
_chemical_formula_sum   'Sr1 Mn1 Sn2'
_cell_volume   99.2
_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
  Sr  Sr3  1  0.79  0.79  0.02  1.0
  Mn  Mn0  1  0.0  0.0  0.52  1.0
  Sn  Sn1  1  0.79  0.79  0.26  1.0
  Sn  Sn2  1  0.0  0.0  0.54  1.0

data_SrMnSn2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.06
_cell_length_b   5.06
_cell_length_c   7.74
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrMnSn2
_chemical_formula_sum   'Sr2 Mn2 Sn4'
_cell_volume   198.41
_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
  Sr  Sr0  2  0.29  0.5  0.02  1.0
  Mn  Mn1  2  0.0  0.0  0.52  1.0
  Sn  Sn2  2  0.0  0.0  0.54  1.0
  Sn  Sn3  2  0.29  0.5  0.26  1.0

Sr Mn Sn Sn
Sr Mn Sn Sn 0 2 o o o 1 3 o o o 1 2 - - o 
SrMnSn2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two SrMnSn2 clusters. Sr(1) is bonded in a single-bond geometry to one Sn(1) atom. The Sr(1)-Sn(1) bond length is 1.90 Å. Mn(1) is bonded in a single-bond geometry to one Sn(1) and one Sn(2) atom. The Mn(1)-Sn(1) bond length is 2.26 Å. The Mn(1)-Sn(2) bond length is 0.15 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a bent 150 degrees geometry to one Sr(1) and one Mn(1) atom. In the second Sn site, Sn(2) is bonded in a single-bond geometry to one Mn(1) atom.