data_ScSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.24
_cell_length_b   3.24
_cell_length_c   7.16
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   91.14
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ScSi
_chemical_formula_sum   'Sc2 Si2'
_cell_volume   75.25
_cell_formula_units_Z   2
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
  Sc  Sc0  1  0.27  0.16  0.28  1.0
  Sc  Sc1  1  0.27  0.84  0.88  1.0
  Si  Si2  1  0.27  0.16  0.13  1.0
  Si  Si3  1  0.27  0.84  0.03  1.0

data_ScSi
_symmetry_space_group_name_H-M   P2/m
_cell_length_a   3.24
_cell_length_b   3.24
_cell_length_c   7.16
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   10
_chemical_formula_structural   ScSi
_chemical_formula_sum   'Sc2 Si2'
_cell_volume   75.26
_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, y, -z'
  4  '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
  Sc  Sc0  2  0.16  0.5  0.2  1.0
  Si  Si1  2  0.16  0.5  0.05  1.0

Sc Sc Si Si
Sc Sc Si Si 0 2 o o o 1 3 o o + 2 3 o - o 
ScSi crystallizes in the monoclinic P2/m space group. The structure is zero-dimensional and consists of two ScSi clusters. Sc(1) is bonded in a single-bond geometry to one Si(1) atom. The Sc(1)-Si(1) bond length is 1.10 Å. Si(1) is bonded in a distorted single-bond geometry to one Sc(1) atom.