data_ZrSn2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.16
_cell_length_b   5.16
_cell_length_c   3.16
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ZrSn2
_chemical_formula_sum   'Zr1 Sn2'
_cell_volume   83.98
_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
  Zr  Zr2  1  0.0  0.0  0.0  1.0
  Sn  Sn0  1  0.0  0.58  0.58  1.0
  Sn  Sn1  1  0.58  0.0  0.58  1.0

data_ZrSn2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.29
_cell_length_b   7.29
_cell_length_c   3.16
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   ZrSn2
_chemical_formula_sum   'Zr2 Sn4'
_cell_volume   167.96
_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
  Zr  Zr0  2  0.0  0.0  0.0  1.0
  Sn  Sn1  4  0.29  0.29  0.58  1.0

Zr Sn Sn
ZrSn2 crystallizes in the monoclinic Cm space group. Zr(1) is bonded in a 8-coordinate geometry to eight equivalent Sn(1) atoms. There are a spread of Zr(1)-Sn(1) bond distances ranging from 2.55-3.50 Å. Sn(1) is bonded in a 7-coordinate geometry to four equivalent Zr(1) and three equivalent Sn(1) atoms. There is one shorter (3.07 Å) and two longer (3.16 Å) Sn(1)-Sn(1) bond lengths.