data_YNi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.05
_cell_length_b   5.05
_cell_length_c   5.05
_cell_angle_alpha   141.81
_cell_angle_beta   141.81
_cell_angle_gamma   55.12
_symmetry_Int_Tables_number   1
_chemical_formula_structural   YNi2
_chemical_formula_sum   'Y1 Ni2'
_cell_volume   48.86
_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
  Y  Y2  1  0.0  0.0  0.0  1.0
  Ni  Ni0  1  0.0  0.0  0.17  1.0
  Ni  Ni1  1  0.0  0.0  0.79  1.0

data_YNi2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.67
_cell_length_b   4.67
_cell_length_c   5.05
_cell_angle_alpha   90.0
_cell_angle_beta   117.56
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   YNi2
_chemical_formula_sum   'Y2 Ni4'
_cell_volume   97.71
_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
  Y  Y0  2  0.0  0.0  0.0  1.0
  Ni  Ni1  2  0.17  0.0  0.17  1.0
  Ni  Ni2  2  0.29  0.5  0.79  1.0

Y Ni Ni
YNi2 is Cyanogen Chloride-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two YNi2 clusters. Y(1) is bonded in a linear geometry to one Ni(1) and one Ni(2) atom. The Y(1)-Ni(1) bond length is 0.84 Å. The Y(1)-Ni(2) bond length is 1.08 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a single-bond geometry to one Y(1) atom. In the second Ni site, Ni(2) is bonded in a single-bond geometry to one Y(1) atom.