data_Zn2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.38
_cell_length_b   7.38
_cell_length_c   7.38
_cell_angle_alpha   21.18
_cell_angle_beta   21.18
_cell_angle_gamma   21.18
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Zn2Si
_chemical_formula_sum   'Zn2 Si1'
_cell_volume   45.93
_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
  Zn  Zn1  1  0.0  0.0  0.85  1.0
  Zn  Zn2  1  0.0  0.0  1.0  1.0
  Si  Si0  1  0.0  0.0  0.63  1.0

data_Zn2Si
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.7
_cell_length_b   2.71
_cell_length_c   7.38
_cell_angle_alpha   90.0
_cell_angle_beta   102.25
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Zn2Si
_chemical_formula_sum   'Zn4 Si2'
_cell_volume   91.86
_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
  Zn  Zn0  2  -0.0  0.0  0.15  1.0
  Zn  Zn1  2  -0.0  0.0  0.0  1.0
  Si  Si2  2  -0.0  0.0  0.37  1.0

Zn Zn Si
Zn Zn Si 0 1 o o o 0 2 o o o 
Zn2Si is Cyanogen Chloride-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Zn2Si clusters. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a linear geometry to one Zn(2) and one Si(1) atom. The Zn(1)-Zn(2) bond length is 1.07 Å. The Zn(1)-Si(1) bond length is 1.67 Å. In the second Zn site, Zn(2) is bonded in a single-bond geometry to one Zn(1) atom. Si(1) is bonded in a single-bond geometry to one Zn(1) atom.