data_NiRu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.64
_cell_length_b   2.64
_cell_length_c   7.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NiRu
_chemical_formula_sum   'Ni2 Ru2'
_cell_volume   50.1
_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
  Ni  Ni0  1  0.32  0.0  0.84  1.0
  Ni  Ni1  1  0.0  0.32  0.34  1.0
  Ru  Ru2  1  0.32  0.0  0.54  1.0
  Ru  Ru3  1  0.0  0.32  0.64  1.0

data_NiRu
_symmetry_space_group_name_H-M   C2/m
_cell_length_a   3.74
_cell_length_b   3.74
_cell_length_c   7.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   12
_chemical_formula_structural   NiRu
_chemical_formula_sum   'Ni4 Ru4'
_cell_volume   100.21
_cell_formula_units_Z   4
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'
  5  'x+1/2, y+1/2, z'
  6  '-x+1/2, -y+1/2, -z'
  7  '-x+1/2, y+1/2, -z'
  8  '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  0.16  0.5  0.75  1.0
  Ru  Ru1  4  0.16  0.5  0.45  1.0

Ni Ni Ru Ru
Ni Ni Ru Ru 0 3 o o o 0 2 o o o 1 2 o o o 1 3 o o o 2 3 o o o 
RuNi crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of two RuNi clusters. Ru(1) is bonded in a 2-coordinate geometry to one Ru(1) and one Ni(1) atom. The Ru(1)-Ru(1) bond length is 1.41 Å. The Ru(1)-Ni(1) bond length is 1.86 Å. Ni(1) is bonded in a distorted single-bond geometry to one Ru(1) atom.