data_Sn2Ir
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.47
_cell_length_b   4.47
_cell_length_c   3.43
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sn2Ir
_chemical_formula_sum   'Sn2 Ir1'
_cell_volume   68.29
_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
  Sn  Sn1  1  0.0  0.23  0.71  1.0
  Sn  Sn2  1  0.23  0.0  0.71  1.0
  Ir  Ir0  1  0.0  0.0  0.0  1.0

data_Sn2Ir
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.31
_cell_length_b   6.31
_cell_length_c   3.43
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Sn2Ir
_chemical_formula_sum   'Sn4 Ir2'
_cell_volume   136.59
_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
  Sn  Sn0  4  0.12  0.12  0.71  1.0
  Ir  Ir1  2  0.0  0.0  0.0  1.0

Sn Sn Ir
Sn Sn Ir 0 2 o o + 0 1 o o o 1 2 o o + 
IrSn2 is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two IrSn2 clusters. Ir(1) is bonded in a 2-coordinate geometry to two equivalent Sn(1) atoms. Both Ir(1)-Sn(1) bond lengths are 1.43 Å. Sn(1) is bonded in a distorted single-bond geometry to one Ir(1) atom.