data_V2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.79
_cell_length_b   8.79
_cell_length_c   8.79
_cell_angle_alpha   158.92
_cell_angle_beta   158.92
_cell_angle_gamma   29.98
_symmetry_Int_Tables_number   1
_chemical_formula_structural   V2Si
_chemical_formula_sum   'V4 Si2'
_cell_volume   87.84
_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
  V  V2  1  0.61  0.0  0.38  1.0
  V  V3  1  0.0  0.0  0.36  1.0
  V  V4  1  0.61  0.0  0.11  1.0
  V  V5  1  0.0  0.0  0.62  1.0
  Si  Si0  1  0.0  0.61  0.25  1.0
  Si  Si1  1  0.0  0.0  0.0  1.0

data_V2Si
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.22
_cell_length_b   3.22
_cell_length_c   8.79
_cell_angle_alpha   100.54
_cell_angle_beta   100.54
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   V2Si
_chemical_formula_sum   'V4 Si2'
_cell_volume   87.84
_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
  V  V0  1  0.38  0.0  0.38  1.0
  V  V1  1  0.62  0.0  0.23  1.0
  V  V2  1  0.64  0.0  0.64  1.0
  V  V3  1  0.89  0.0  0.49  1.0
  Si  Si4  1  0.0  0.0  0.0  1.0
  Si  Si5  1  0.36  0.61  0.36  1.0

V V V V Si Si
V V V V Si Si 0 3 + o o 0 5 + o + 0 5 o o o 1 2 - o o 1 5 o o o 2 3 + o o 3 4 o - o 5 5 + o + 5 5 o + + 
V2Si crystallizes in the triclinic P1 space group. There are four inequivalent V sites. In the first V site, V(1) is bonded in a 5-coordinate geometry to one V(4), two equivalent Si(1), and two equivalent Si(2) atoms. The V(1)-V(4) bond length is 1.62 Å. There is one shorter (2.13 Å) and one longer (2.32 Å) V(1)-Si(1) bond length. There is one shorter (2.54 Å) and one longer (2.57 Å) V(1)-Si(2) bond length. In the second V site, V(2) is bonded in a 1-coordinate geometry to one V(3) and one Si(2) atom. The V(2)-V(3) bond length is 1.62 Å. The V(2)-Si(2) bond length is 3.18 Å. In the third V site, V(3) is bonded in a 5-coordinate geometry to one V(2), two equivalent V(4), and two equivalent Si(1) atoms. There is one shorter (1.77 Å) and one longer (2.04 Å) V(3)-V(4) bond length. There is one shorter (2.13 Å) and one longer (2.32 Å) V(3)-Si(1) bond length. In the fourth V site, V(4) is bonded in a distorted single-bond geometry to one V(1), two equivalent V(3), and one Si(1) atom. The V(4)-Si(1) bond length is 1.24 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted single-bond geometry to one V(4), two equivalent V(1), and two equivalent V(3) atoms. In the second Si site, Si(2) is bonded in a 3-coordinate geometry to one V(2) and two equivalent V(1) atoms.