data_Ni8W
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.62
_cell_length_b   5.62
_cell_length_c   5.62
_cell_angle_alpha   95.79
_cell_angle_beta   95.79
_cell_angle_gamma   142.97
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ni8W
_chemical_formula_sum   'Ni8 W1'
_cell_volume   101.24
_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
  Ni  Ni0  1  0.26  0.74  0.78  1.0
  Ni  Ni1  1  0.74  0.26  0.78  1.0
  Ni  Ni2  1  0.0  0.02  0.0  1.0
  Ni  Ni3  1  0.51  0.51  0.0  1.0
  Ni  Ni4  1  0.02  0.0  0.0  1.0
  Ni  Ni5  1  0.26  0.26  0.78  1.0
  Ni  Ni6  1  0.0  0.52  0.0  1.0
  Ni  Ni7  1  0.52  0.0  0.0  1.0
  W  W8  1  0.0  0.0  0.0  1.0

data_Ni8W
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.57
_cell_length_b   10.65
_cell_length_c   5.62
_cell_angle_alpha   90.0
_cell_angle_beta   108.52
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ni8W
_chemical_formula_sum   'Ni16 W2'
_cell_volume   202.49
_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
  Ni  Ni0  4  0.24  0.24  0.0  1.0
  Ni  Ni1  4  0.28  0.24  0.78  1.0
  Ni  Ni2  4  0.49  0.49  0.0  1.0
  Ni  Ni3  2  0.02  0.5  0.78  1.0
  Ni  Ni4  2  0.49  0.0  0.0  1.0
  W  W5  2  0.0  0.0  0.0  1.0

Ni Ni Ni Ni Ni Ni Ni Ni W
Ni Ni Ni Ni Ni Ni Ni Ni W 0 7 o + + 1 6 + o + 2 8 o o o 3 5 o o - 4 8 o o o 
Ni4W(Ni)4 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of four Ni clusters and two Ni4W clusters. In each Ni cluster, Ni(1,5) is bonded in a distorted single-bond geometry to one Ni(1,5) atom. The Ni(1,5)-Ni(1,5) bond length is 1.27 Å. In each Ni4W cluster, W(1) is bonded in a bent 150 degrees geometry to one Ni(3) and two equivalent Ni(2) atoms. The W(1)-Ni(3) bond length is 1.76 Å. Both W(1)-Ni(2) bond lengths are 0.09 Å. There are three inequivalent Ni sites. In the first Ni site, Ni(2) is bonded in a single-bond geometry to one W(1) atom. In the second Ni site, Ni(3) is bonded in a distorted bent 120 degrees geometry to one W(1) and one Ni(4) atom. The Ni(3)-Ni(4) bond length is 1.25 Å. In the third Ni site, Ni(4) is bonded in a single-bond geometry to one Ni(3) atom.